Thai language

Not to be confused with Tai languages.

Thai
Siamese
ภาษาไทย, Phasa Thai
Pronunciation	[pʰāːsǎːtʰāj]
Region	Thailand Cambodia: (Koh Kong District)
Ethnicity	Central Thai, Thai Chinese, Malaysian Siamese
Native speakers	20–36 million (2000) 44 million L2 speakers with Lanna, Isan, Southern Thai, Northern Khmer and Lao (2001)
Language family	Kra–Dai Tai Southwestern Tai Chiang Saen Thai
Writing system	Thai script Thai Braille
Official status
Official language in	Thailand ASEAN
Recognised minority language in	Cambodia (Koh Kong) Malaysia (Kedah, Perlis, Kelantan and Hulu Perak district) Myanmar (Tanintharyi)
Regulated by	Royal Society of Thailand
Language codes
ISO 639-1	th
ISO 639-2	tha
ISO 639-3	tha
Glottolog	thai1261
Linguasphere	47-AAA-b

A native Thai speaker, recorded in Bangkok.

Thai, Central Thai (historically Siamese; Thai: ภาษาไทย), is a Tai language of the Kra–Dai language family spoken by Central Thai people and vast majority of Thai Chinese. It is the national language of Thailand and de facto official language.

Thai is the most spoken of over 60 languages of Thailand by both number of native and overall speakers. Over half of its vocabulary is derived from or borrowed from Pali, Sanskrit, Mon and Old Khmer. It is a tonal and analytic language, similar to Chinese and Vietnamese.

Thai has a complex orthography and system of relational markers. Spoken Thai, depending on standard sociolinguistic factors such as age, gender, class, spatial proximity, and the urban/rural divide, is partly mutually intelligible with Lao, Isan, and some fellow Southwestern Tai languages. These languages are written with slightly different scripts but are linguistically similar and effectively form a dialect continuum.

As a dominant language in all aspects of society in Thailand, Thai initially saw gradual and later widespread adoption as a second language among the country's minority ethnic groups since the establishment of the Rattanakosin Kingdom in late 18th century. Ethnic minorities today are predominantly bilingual, speaking Thai alongside their native language or dialect.

Classification

Further information: Tai–Kadai languages, Tai languages, and Tai peoples

Standard Thai is classified as one of the Chiang Saen languages—others being Tai Lanna, Southern Thai and numerous smaller languages, which together with the Northwestern Tai and Lao-Phutai languages, form the Southwestern branch of Tai languages. The Tai languages are a branch of the Kra–Dai language family, which encompasses a large number of indigenous languages spoken in an arc from Hainan and Guangxi south through Laos and Northern Vietnam to the Cambodian border.

Standard Thai is the principal language of education and government and spoken throughout Thailand. The standard is based on the dialect of the central Thai people, and it is written in the Thai alphabet.

Kra-Dai

Hlai languages Kam-Sui languages Kra languages Be language  Tai languages  Northern Tai languages Central Tai languages Southwestern Tai languages Northwestern Tai languages Khamti language Tai Lue language Shan language others Chiang Saen languages Northern Thai language Sukhothai language Thai language Southern Thai language Lao‑Phuthai languages Tai Yo language Phuthai language Lao language (Isan language)

History

According to Chinese source, during Ming Dynasty, Yingya Shenglan (1405–1433), Ma Huan reported on the language of the Hsien Lo somewhat resembles the local patois as pronounced in Kuang tung province Thai has undergone various historical sound changes. Some of the most significant changes occurred during the evolution from Old Thai to modern Thai. The Thai writing system has an eight-century history and many of these changes, especially in consonants and tones, are evidenced in the modern orthography.

Old Thai

Old Thai had a three-way tone distinction on "live syllables" (those not ending in a stop), with no possible distinction on "dead syllables" (those ending in a stop, i.e. either /p/, /t/, /k/ or the glottal stop which automatically closes syllables otherwise ending in a short vowel).

There was a two-way voiced vs. voiceless distinction among all fricative and sonorant consonants, and up to a four-way distinction among stops and affricates. The maximal four-way occurred in labials (/p pʰ b ʔb/) and dentals (/t tʰ d ʔd/); the three-way distinction among velars (/k kʰ ɡ/) and palatals (/tɕ tɕʰ dʑ/), with the glottalized member of each set apparently missing.

The major change between old and modern Thai was due to voicing distinction losses and the concomitant tone split. This may have happened between about 1300 and 1600 CE, possibly occurring at different times in different parts of the Thai-speaking area. All voiced–voiceless pairs of consonants lost the voicing distinction:

• Plain voiced stops (/b d ɡ dʑ/) became voiceless aspirated stops (/pʰ tʰ kʰ tɕʰ/).
• Voiced fricatives became voiceless.
• Voiceless sonorants became voiced.

However, in the process of these mergers the former distinction of voice was transferred into a new set of tonal distinctions. In essence, every tone in Old Thai split into two new tones, with a lower-pitched tone corresponding to a syllable that formerly began with a voiced consonant, and a higher-pitched tone corresponding to a syllable that formerly began with a voiceless consonant (including glottalized stops). An additional complication is that formerly voiceless unaspirated stops/affricates (original /p t k tɕ ʔb ʔd/) also caused original tone 1 to lower, but had no such effect on original tones 2 or 3.

The above consonant mergers and tone splits account for the complex relationship between spelling and sound in modern Thai. Modern "low"-class consonants were voiced in Old Thai, and the terminology "low" reflects the lower tone variants that resulted. Modern "mid"-class consonants were voiceless unaspirated stops or affricates in Old Thai—precisely the class that triggered lowering in original tone 1 but not tones 2 or 3. Modern "high"-class consonants were the remaining voiceless consonants in Old Thai (voiceless fricatives, voiceless sonorants, voiceless aspirated stops). The three most common tone "marks" (the lack of any tone mark, as well as the two marks termed mai ek and mai tho) represent the three tones of Old Thai, and the complex relationship between tone mark and actual tone is due to the various tonal changes since then. Since the tone split, the tones have changed in actual representation to the point that the former relationship between lower and higher tonal variants has been completely obscured. Furthermore, the six tones that resulted after the three tones of Old Thai were split have since merged into five in standard Thai, with the lower variant of former tone 2 merging with the higher variant of former tone 3, becoming the modern "falling" tone.

Early Old Thai

Further information: Proto-Tai

Early Old Thai also apparently had velar fricatives /x ɣ/ as distinct phonemes. These were represented by the now-obsolete letters ฃ kho khuat and ฅ kho khon, respectively. During the Old Thai period, these sounds merged into the corresponding stops /kʰ ɡ/, and as a result the use of these letters became unstable.

At some point in the history of Thai, a palatal nasal phoneme /ɲ/ also existed, inherited from Proto-Tai. A letter ญ yo ying also exists, which is used to represent a palatal nasal in words borrowed from Sanskrit and Pali, and is currently pronounced /j/ at the beginning of a syllable but /n/ at the end of a syllable. Most native Thai words that are reconstructed as beginning with /ɲ/ are also pronounced /j/ in modern Thai, but generally spelled with ย yo yak, which consistently represents /j/. This suggests that /ɲ/ > /j/ in native words occurred in the pre-literary period. It is unclear whether Sanskrit and Pali words beginning with /ɲ/ were borrowed directly with a /j/, or whether a /ɲ/ was re-introduced, followed by a second change /ɲ/ > /j/.

Proto-Tai also had a glottalized palatal sound, reconstructed as /ʔj/ in Li Fang-Kuei (1977). Corresponding Thai words are generally spelled หย, which implies an Old Thai pronunciation of /hj/ (or /j̊/), but a few such words are spelled อย, which implies a pronunciation of /ʔj/ and suggests that the glottalization may have persisted through to the early literary period.

Vowel developments

The vowel system of modern Thai contains nine pure vowels and three centering diphthongs, each of which can occur short or long. According to Li (1977), however, many Thai dialects have only one such short–long pair (/a aː/), and in general it is difficult or impossible to find minimal short–long pairs in Thai that involve vowels other than /a/ and where both members have frequent correspondences throughout the Tai languages. More specifically, he notes the following facts about Thai:

• In open syllables, only long vowels occur. (This assumes that all apparent cases of short open syllables are better described as ending in a glottal stop. This makes sense from the lack of tonal distinctions in such syllables, and the glottal stop is also reconstructible across the Tai languages.)
• In closed syllables, the long high vowels /iː ɯː uː/ are rare, and cases that do exist typically have diphthongs in other Tai languages.
• In closed syllables, both short and long mid /e eː o oː/ and low /ɛ ɛː ɔ ɔː/ do occur. However, generally, only words with short /e o/ and long /ɛː ɔː/ are reconstructible back to Proto-Tai.
• Both of the mid back unrounded vowels /ɤ ɤː/ are rare, and words with such sounds generally cannot be reconstructed back to Proto-Tai.

Furthermore, the vowel that corresponds to short Thai /a/ has a different and often higher quality in many of the Tai languages compared with the vowel corresponding to Thai /aː/.

This leads Li to posit the following:

1. Proto-Tai had a system of nine pure vowels with no length distinction, and possessing approximately the same qualities as in modern Thai: high /i ɯ u/, mid /e ɤ o/, low /ɛ a ɔ/.
2. All Proto-Tai vowels were lengthened in open syllables, and low vowels were also lengthened in closed syllables.
3. Modern Thai largely preserved the original lengths and qualities, but lowered /ɤ/ to /a/, which became short /a/ in closed syllables and created a phonemic length distinction /a aː/. Eventually, length in all other vowels became phonemic as well and a new /ɤ/ (both short and long) was introduced, through a combination of borrowing and sound change. Li believes that the development of long /iː ɯː uː/ from diphthongs, and the lowering of /ɤ/ to /a/ to create a length distinction /a aː/, had occurred by the time of Proto-Southwestern-Tai, but the other missing modern Thai vowels had not yet developed.

Note that not all researchers agree with Li. Pittayaporn (2009), for example, reconstructs a similar system for Proto-Southwestern-Tai, but believes that there was also a mid back unrounded vowel /ə/ (which he describes as /ɤ/), occurring only before final velar /k ŋ/. He also seems to believe that the Proto-Southwestern-Tai vowel length distinctions can be reconstructed back to similar distinctions in Proto-Tai.

Dialects

According to Ethnologue, Thai language is spoken by over 20 million people (2000). Moreover, most Thais in the northern and the northeastern (Isaan) parts of the country today are bilingual speakers of Central Thai and their respective regional dialects due to the fact that (Central) Thai is the language of television, education, news reporting, and all forms of media. A recent research found that the speakers of the Northern Thai language (or Kham Mueang) have become so few, as most people in northern Thailand now invariably speak Standard Thai, so that they are now using mostly Central Thai words and seasoning their speech only with "kham mueang" accent. Standard Thai is based on the register of the educated classes in Bangkok. In addition to Central Thai, Thailand is home to other related Tai languages. Although some linguists classify these dialects as related but distinct languages, native speakers often identify them as regional variants or dialects of the "same" Thai language, or as "different kinds of Thai".

Central Plains Thai

• Eastern Central Plains.
  • Ayutthaya dialect (Standard Thai, Outer Bangkok), natively spoken in the vicinity of Bangkok such as Ayutthaya, Ang Thong, Lopburi, Saraburi, Nakhon Nayok, Nonthaburi, Pathum Thani, Samut Sakhon and Samut Prakan Provinces, along with Northern Bangkok. This dialect is the standard form and is the only one used in the educational system and on Thai Royal News or conservative Thai language media.
  • Thonburi dialect (also called Bangkok dialect), spoken in the Thon Buri District of Bangkok. This dialect has some Portuguese and Persian influences.
  • Minburi dialect, spoken in Eastern Bangkok (Minburi, Nongchok, Khlongsamwa and Latkrabang), this dialect has some Melayu language influence.
  • Eastern dialect, spoken in Chachoengsao (except Mueang Paet Riu, Bang Khla, Ban Pho and Bang Pakong Districts, which speak the Chonburi dialect) and Prachinburi (except Nadi and Prachantakham Districts which speak Isan)
  • Vientiane Central Thai, spoken in Tha Bo District and some parts of Ratchaburi Province. Closely related to and is sometimes considered as a variety of the Ayutthaya dialect.
• Western Central Plains.
  • Suphanburi dialect, spoken in Suphan Buri, Sing Buri, Nakhon Pathom, part of Samut Songkhram, part of Ratchaburi and some parts of Rayong. This dialect was the standard form in the Ayutthaya Kingdom, but today remain in Khon only.
  • Kanchanaburi dialect, spoken in Kanchanaburi. Closely related to and is sometimes classified as a variety of the Suphanburi dialect.
  • Rayong dialect, spoken in Rayong Province, Bang Lamung (outside Pattaya City), Sattahip and part of Si Racha District
  • Chantaburi-Trat dialect, spoken in Chanthaburi, Trat and Southern part of Sa Kaeo and part of Koh Kong Province of Cambodia.

Capital Core Thai

• Core area.
  • Krung Thep dialect (also called Phra Nakhon dialect; prestige dialect), natively spoken in the core area of the Phra Nakhon side of Bangkok (but not in Eastern and Northern Bangkok which natively speak Standard Thai), very high Teochew and some Hakka influences. Almost all of media in Thailand operated in this dialect.
  • Chonburi dialect (called Paet Riu dialect in Chachoengsao Province), spoken in most upper parts of Chonburi Province (also in Pattaya), Mueang Paet Riu, Bang Khla, Ban Pho and Bang Pakong Districts in Chachoengsao, Si Mahosot, and Aranyaprathet District. This dialect is very similar with the Krungthep dialect.
• Enclave areas
  • Nangrong dialect, spoken by Teochew traders in Nang Rong District. This dialect is enclaved by the Isan, Northern Khmer and Kuy languages.
  • Photharam dialect, a language enclave in Photharam, Ban Pong and Mueang Ratchaburi districts, but classified as a Capital dialects. This dialect is enclaved by the Ratchaburi dialect.
  • Hatyai dialect, spoken by non-Peranakan of Chinese origin (particularly Teochews) in Hat Yai District (Peranakans speak Southern Thai language). Very high Teochew and some Southern Thai influences, in Southern Thai called Leang Ka Luang (Southern Thai: แหลงข้าหลวง, literally: Bureaucrat speech). This dialect is enclaved by Southern Thai.
  • Bandon dialect, spoken by non-Peranakan of Chinese origin (particularly Hoklos and Teochews) in Bandon District; very similar with the Hatyai dialect and also enclaved by Southern Thai.
  • Betong dialect, spoken by non-Peranakan of Chinese origin (particularly Cantonese from Watlam) in the Patani area, high Goulou Yue and Teochew with some Southern Thai and Yawi language influences. This dialect is enclaved by the Southern Thai and Yawi languages.

Upper Central Thai (Sukhothai dialects)

• New Sukhothai dialect, spoken in Sukhothai, Kamphaeng Phet, Phichit and part of Tak Province. High Northern Thai influence.
• Phitsanulok dialect, or old Sukhothai dialect, spoken in Phitsanulok, Phetchabun and part of Uttaradit Province. This dialect was the standard form in the vassal state of Phitsanuloksongkwae.
• Pak Nam Pho dialect, spoken in Nakhon Sawan, Uthai Thani, Chainat, part of Phichit and part of Kamphaeng Phet Province.

Southwestern Thai (Tenasserim Thai)

• Ratchaburi dialect, spoken in Ratchaburi and most areas in Samut Songkhram Province.
• Prippri dialect, spoken in Phetchaburi and Prachuap Khiri Khan Provinces (except Thap Sakae, Bang Saphan and Bang Saphan Noi Districts).

Khorat Thai

Main article: Khorat Thai

Phonology

Consonants

Initials

Standard Thai distinguishes three voice-onset times among plosive and affricate consonants:

• voiced
• tenuis (unvoiced, unaspirated)
• aspirated

Where English makes a distinction between voiced /b/ and unvoiced aspirated /pʰ/, Thai distinguishes a third sound - the unvoiced, unaspirated /p/ that occurs in English only as an allophone of /pʰ/, for example after an /s/ as in the sound of the p in "spin". There is similarly an alveolar /d/, /t/, /tʰ/ triplet in Thai. In the velar series there is a /k/, /kʰ/ pair and in the postalveolar series a /t͡ɕ/, /t͡ɕʰ/ pair, but the language lacks the corresponding voiced sounds /ɡ/ and /dʑ/. (In loanwords from English, English /ɡ/ and /d͡ʒ/ are borrowed as the tenuis stops /k/ and /t͡ɕ/.)

In each cell below, the first line indicates International Phonetic Alphabet (IPA), the second indicates the Thai characters in initial position (several letters appearing in the same box have identical pronunciation). The letter ห, one of the two h letters, is also used to help write certain tones (described below).

		Labial	Alveolar	Palatal	Velar	Glottal
Nasal		[m] ม	[n] ณ,น		[ŋ] ง
Plosive	voiced	[b] บ	[d] ฎ,ฑ,ด
	tenuis	[p] ป	[t] ฏ,ต		[k] ก	[ʔ] อ**
	aspirated	[pʰ] ผ,พ,ภ	[tʰ] ฐ,ฑ,ฒ,ถ,ท,ธ		[kʰ] ข,ฃ,ค,ฅ,ฆ*
Affricate	tenuis			[tɕ] จ
	aspirated			[tɕʰ] ฉ,ช,ฌ
Fricative		[f] ฝ,ฟ	[s] ซ,ศ,ษ,ส			[h] ห,ฮ
Approximant			[l] ล,ฬ	[j] ญ,ย	[w] ว
Trill			[r] ร

^* ฃ and ฅ are no longer used. Thus, modern Thai is said to have 42 consonant letters.

^** Initial อ is silent and therefore considered as a glottal stop.

Finals

Although the overall 44 Thai consonant letters provide 21 sounds in case of initials, the case for finals is different. For finals, only eight sounds, as well as no sound, called mātrā (มาตรา) are used. To demonstrate, at the end of a syllable, บ (/b/) and ด (/d/) are devoiced, becoming pronounced as /p/ and /t/ respectively. Additionally, all plosive sounds are unreleased. Hence, final /p/, /t/, and /k/ sounds are pronounced as [p̚], [t̚], and [k̚] respectively.

Of the consonant letters, excluding the disused ฃ and ฅ, six (ฉ ผ ฝ ห อ ฮ) cannot be used as a final and the other 36 are grouped as following.

	Labial	Alveolar	Palatal	Velar	Glottal
Nasal	[m] ม	[n] ญ,ณ,น,ร,ล,ฬ		[ŋ] ง
Plosive	[p̚] บ,ป,พ,ฟ,ภ	[t̚] จ,ช,ซ,ฌ,ฎ,ฏ,ฐ,ฑ, ฒ,ด,ต,ถ,ท,ธ,ศ,ษ,ส		[k̚] ก,ข,ค,ฆ	[ʔ]*
Approximant	[w] ว		[j] ย

^* The glottal plosive appears at the end when no final follows a short vowel

Clusters

In Thai, each syllable in a word is considered separate from the others, so combinations of consonants from adjacent syllables are never recognised as a cluster. Thai has phonotactical constraints that define permissible syllable structure, consonant clusters, and vowel sequences. Original Thai vocabulary introduces only 11 combined consonantal patterns:

• /kr/ (กร), /kl/ (กล), /kw/ (กว)
• /kʰr/ (ขร,คร), /kʰl/ (ขล,คล), /kʰw/ (ขว,คว)
• /pr/ (ปร), /pl/ (ปล)
• /pʰr/ (พร), /pʰl/ (ผล,พล)
• /tr/ (ตร)

The number of clusters increases when a few more combinations are presented in loanwords such as /tʰr/ (ทร) in อินทรา (/intʰraː/, from Sanskrit indrā) or /fr/ (ฟร) in ฟรี (/friː/, from English free); however, it can be observed that Thai language supports only those in initial position, with either /r/, /l/, or /w/ as the second consonant sound and not more than two sounds at a time.

Vowels

The vowel nuclei of the Thai language are given in the following table. The top entry in every cell is the symbol from the International Phonetic Alphabet, the second entry gives the spelling in the Thai alphabet, where a dash (–) indicates the position of the initial consonant after which the vowel is pronounced. A second dash indicates that a final consonant must follow.

Monophthongs of Thai. From Tingsabadh & Abramson (1993:25)

Diphthongs of Thai. From Tingsabadh & Abramson (1993:25)

	Front		Back
	Unrounded				Rounded
	short	long	short	long	short	long
High	/i/  -ิ	/iː/  -ี	/ɯ/  -ึ	/ɯː/  -ื-	/u/  -ุ	/uː/  -ู
Mid	/e/ เ-ะ	/eː/ เ-	/ɤ/ เ-อะ	/ɤː/ เ-อ	/o/ โ-ะ	/oː/ โ-
Low	/ɛ/ แ-ะ	/ɛː/ แ-	/a/ -ะ, -ั-	/aː/ -า	/ɔ/ เ-าะ	/ɔː/ -อ

The vowels each exist in long-short pairs: these are distinct phonemes forming unrelated words in Thai, but usually transliterated the same: เขา (khao) means "he" or "she", while ขาว (khao) means "white".

The long-short pairs are as follows:

Long					Short
Thai	IPA	Example			Thai	IPA	Example
–า	/aː/	ฝาน	/fǎːn/	'to slice'	–ะ	/a/	ฝัน	/fǎn/	'to dream'
–ี	/iː/	กรีด	/krìːt/	'to cut'	–ิ	/i/	กริช	/krìt/	'kris'
–ู	/uː/	สูด	/sùːt/	'to inhale'	–ุ	/u/	สุด	/sùt/	'rearmost'
เ–	/eː/	เอน	/ʔēːn/	'to recline'	เ–ะ	/e/	เอ็น	/ʔēn/	'tendon, ligament'
แ–	/ɛː/	แพ้	/pʰɛ́ː/	'to be defeated'	แ–ะ	/ɛ/	แพะ	/pʰɛ́ʔ/	'goat'
–ื-	/ɯː/	คลื่น	/kʰlɯ̂ːn/	'wave'	–ึ	/ɯ/	ขึ้น	/kʰɯ̂n/	'to go up'
เ–อ	/ɤː/	เดิน	/dɤ̄ːn/	'to walk'	เ–อะ	/ɤ/	เงิน	/ŋɤ̄n/	'silver'
โ–	/oː/	โค่น	/kʰôːn/	'to fell'	โ–ะ	/o/	ข้น	/kʰôn/	'thick (soup)'
–อ	/ɔː/	กลอง	/klɔːŋ/	'drum'	เ–าะ	/ɔ/	กล่อง	/klɔ̀ŋ/	'box'

There are also opening and closing diphthongs in Thai, which Tingsabadh & Abramson (1993) analyze as underlyingly /Vj/ and /Vw/. For purposes of determining tone, those marked with an asterisk are sometimes classified as long:

Long		Short
Thai script	IPA	Thai script	IPA
–าย	/aːj/	ไ–*, ใ–*, ไ–ย, -ัย	/aj/
–าว	/aːw/	เ–า*	/aw/
เ–ีย	/iːə/	เ–ียะ	/iə/
–	–	–ิว	/iw/
–ัว	/uːə/	–ัวะ	/uə/
–ูย	/uːj/	–ุย	/uj/
เ–ว	/eːw/	เ–็ว	/ew/
แ–ว	/ɛːw/	–	–
เ–ือ	/ɯːə/	เ–ือะ	/ɯə/
เ–ย	/ɤːj/	–	–
–อย	/ɔːj/	–	–
โ–ย	/oːj/	–	–

Additionally, there are three triphthongs. For purposes of determining tone, those marked with an asterisk are sometimes classified as long:

Thai script	IPA
เ–ียว*	/iəw/
–วย*	/uəj/
เ–ือย*	/ɯəj/

Tones

The five phonemic tones of Standard Thai pronounced with the syllable '/naː/':

There are five phonemic tones: mid, low, falling, high, and rising, sometimes referred to in older reference works as rectus, gravis, circumflexus, altus, and demissus, respectively. The table shows an example of both the phonemic tones and their phonetic realization, in the IPA.

Thai language tone chart

Notes:

1. Five-level tone value: Mid [33], Low [21], Falling [43], High [44], Rising [323]. Traditionally, the high tone was recorded as either [44] or [45]. This remains true for the older generation, but the high tone is changing to [334] among youngsters.
2. For the diachronic changes of tone value, please see Pittayaporn (2007).
3. The full complement of tones exists only in so-called "live syllables", those that end in a long vowel or a sonorant (/m/, /n/, /ŋ/, /j/, /w/).
4. For "dead syllables", those that end in a plosive (/p/, /t/, /k/) or in a short vowel, only three tonal distinctions are possible: low, high, and falling. Because syllables analyzed as ending in a short vowel may have a final glottal stop (especially in slower speech), all "dead syllables" are phonetically checked, and have the reduced tonal inventory characteristic of checked syllables.

Unchecked syllables

Tone	Thai	Example	Phonemic	Phonetic	Gloss
mid	สามัญ	คา	/kʰāː/	[kʰaː˧]	stick
low	เอก	ข่า	/kʰàː/	[kʰaː˨˩] or [kʰaː˩]	galangal
falling	โท	ค่า	/kʰâː/	[kʰaː˥˩]	value
high	ตรี	ค้า	/kʰáː/	[kʰaː˦˥] or [kʰaː˥]	to trade
rising	จัตวา	ขา	/kʰǎː/	[kʰaː˩˩˦] or [kʰaː˩˦]	leg

Checked syllables

Tone	Thai	Example	Phonemic	Phonetic	Gloss
low (short vowel)	เอก	หมัก	/màk/	[mak̚˨˩]	marinate
low (long vowel)	เอก	หมาก	/màːk/	[maːk̚˨˩]	areca nut, areca palm, betel, fruit
high	ตรี	มัก	/mák/	[mak̚˦˥]	habitually, likely to
falling	โท	มาก	/mâːk/	[maːk̚˥˩]	a lot, abundance, many

In some English loanwords, closed syllables with long vowel ending in an obstruent sound, have high tone, and closed syllables with short vowel ending in an obstruent sound have falling tone.

Tone	Thai	Example	Phonemic	Phonetic	Gloss
high	ตรี	มาร์ก	/máːk/	[maːk̚˦˥]	Marc, Mark
high	ตรี	สตาร์ต	/sa.táːt/	[sa.taːt̚˦˥]	start
high	ตรี	บาส(เกตบอล)	/báːt(.kêt.bɔ̄n)/1	[baːt̚˦˥(.ket̚˥˩.bɔn˧)]	basketball
falling	โท	เมกอัป	/méːk.ʔâp/	[meːk̚˦˥.ʔap̚˥˩]	make-up

¹ May be /báːs.kêt.bɔ̄l/ in educated speech.

Grammar

From the perspective of linguistic typology, Thai can be considered to be an analytic language. The word order is subject–verb–object, although the subject is often omitted. Additionally, Thai is an isolating language lacking any form of inflectional morphology whatsoever. Thai pronouns are selected according to the gender and relative status of speaker and audience.

Adjectives and adverbs

There is no morphological distinction between adverbs and adjectives. Many words can be used in either function. They follow the word they modify, which may be a noun, verb, or another adjective or adverb.

• คนอ้วน (khon uan, [kʰon ʔûən ]) a fat person
• คนที่อ้วนเร็ว (khon thi uan reo, [khon tʰîː ʔûən rew]) a person who became fat quickly

Comparatives take the form "A X กว่า B" (kwa, [kwàː]), A is more X than B. The superlative is expressed as "A X ที่สุด" (thi sut, [tʰîːsùt]), A is most X.

• เขาอ้วนกว่าฉัน (khao uan kwa chan, [kʰǎw ʔûən kwàː tɕ͡ʰǎn]) S/he is fatter than me.
• เขาอ้วนที่สุด (khao uan thi sut, [kʰǎw ʔûən tʰîːsùt]) S/he is the fattest (of all).

Adjectives in Thai can be used as complete predicates. Because of this many words used to indicate tense in verbs (see Verbs:Tense below) may be used to describe adjectives.

• ฉันหิว (chan hiu, [tɕ͡ʰǎn hǐw]) I am hungry.
• ฉันจะหิว (chan cha hiu, [tɕ͡ʰǎn tɕ͡àʔ hǐw]) I will be hungry.
• ฉันกำลังหิว (chan kamlang hiu, [tɕ͡ʰǎn kamlaŋ hǐw]) I am hungry right now.
• ฉันหิวแล้ว (chan hiu laeo, [tɕ͡ʰǎn hǐw lɛ́ːw]) I am already hungry.

• Remark ฉันหิวแล้ว mostly means "I am hungry right now" because normally, แล้ว ([lɛ́ːw]) marks the change of a state, but แล้ว has many other uses as well. For example, in the sentence, แล้วเธอจะไปไหน ([lɛ́ːw tʰɤː tɕ͡àʔ paj nǎj]): So where are you going?, แล้ว ([lɛ́ːw]) is used as a discourse particle

Verbs

Verbs do not inflect. They do not change with person, tense, voice, mood, or number; nor are there any participles. Being an analytic and case-less language, the relationship between subject, direct and indirect object is conveyed through word order and auxilliary verbs. Transitive verbs follow the pattern subject-verb-object.

• ฉันตีเขา (chan ti khao, [t͡ɕʰǎn tiː kʰǎw]), I hit him.
• เขาตีฉัน (khao ti chan, [kʰǎw tiː t͡ɕʰǎn]), He hit me.

In order to convey tense, aspect and mood (TAM), the Thai verbal system employs auxiliaries and verb serialization. TAM markers are however not obligatory and often left out in colloquial use. In such cases, the precise meaning is determined through context. This results in sentences lacking both TAM markers and overt context being ambiguous and subject to various interpretations.

• ฉันกินที่นั่น (chan kin thi nan, [t͡ɕʰǎn kin tʰîːnân]), I eat there.
• ฉันกินที่นั่นเมื่อวาน (chan kin thi nan mueawan), I ate there yesterday.
• ฉันกินที่นั่นพรุ่งนี้ (chan kin thi nan phrungni), I'll eat there tomorrow.

The sentence "chan kin thi nan" can thus be interpreted as "I am eating there", "I eat there habitually", "I will eat there" or "I ate there". Aspect markers in Thai have been divided in to four distinct groups based on their usage. These markers could appear either before or after the verb. The following list describes some of the most commonly used aspect markers. A number of these aspect markers are also full verbs on their own and carry a distinct meaning. For example yu as a full verb means "to stay, to live or to remain at". However as an auxilliary it can be described as a temporary aspect or continuative marker.

• Imperfective
  • อยู่ yu
  • ไป pai
  • ยัง yang
  • กำลัง kamlang
• Perfective
  • ได้ dai
• Perfect
  • แล้ว laew,
  • มา ma
• Prospective/Future
  • จะ cha

The imperfective aspect marker กำลัง (kamlang, [kamlaŋ], currently) is used before the verb to denote an ongoing action (similar to the -ing suffix in English). Kamlang is commonly interpreted as a progressive aspect marker. Similarly, อยู่ (yu, [jùː]) is a post-verbal aspect marker which corresponds to the continuative or temporary aspect.

• เขากำลังวิ่ง (khao kamlang wing, [kʰǎw kamlaŋ wîŋ]), or
• เขาวิ่งอยู่ (khao wing yu, [kʰǎw wîŋ jùː]), or
• เขากำลังวิ่งอยู่ (khao kamlang wing yu, [kʰǎw kamlaŋ wîŋ jùː]), He is running.

The marker ได้ (dai, [dâːj]) is usually analyzed as a past tense marker when it occurs before the verb. As a full verb, dai means to 'get or receive'. However, when used after a verb, dai takes on a meaning of potentiality or successful outcome of the main verb.

• เขาได้ไปเที่ยวเมืองลาว (khao cha dai pai thiao mueang lao, [kʰǎw t͡ɕaʔ dâj paj tʰîow mɯːəŋ laːw]), He visited Laos. (Past/Perfective)

• เขาตีได้ (khao ti dai, [kʰǎw tiː dâːj]), He is/was allowed to hit or He is/was able to hit. (Potentiality)

แล้ว (laeo,  :[lɛ́ːw], already) is treated as a marker indicating the perfect aspect. That is to say, laeo marks the event as being completed at the time of reference. Laeo has to other meanings in addition to its use as a TAM marker. Laeo can either be a conjunction for sequential actions or an archaic word for "to finish".

• เขาได้กิน (khao dai kin, [kʰǎw dâːj kin]), He ate.
• เขากินแล้ว (khao kin laeo, [kʰǎw kin lɛ́ːw], He has eaten.
• เขาได้กินแล้ว (khao dai kin laeo, [kʰǎw dâːj kin lɛ́ːw]), He's already eaten.

Future can be indicated by จะ (cha, [t͡ɕaʔ], "will") before the verb or by a time expression indicating the future. For example:

• เขาจะวิ่ง (khao cha wing, [kʰǎw t͡ɕaʔ wîŋ]), He will run or He is going to run.

The passive voice is indicated by the insertion of ถูก (thuk, [tʰùːk]) before the verb. For example:

• เขาถูกตี (khao thuk ti, [kʰǎw tʰùːk tiː]), He is hit. This describes an action that is out of the receiver's control and, thus, conveys suffering.

Negation is indicated by placing ไม่ (mai,[mâj] not) before the verb.

• เขาไม่ตี, (khao mai ti) He is not hitting. or He doesn't hit.

Thai exhibits serial verb constructions, where verbs are strung together. Some word combinations are common and may be considered set phrases.

• เขาไปกินข้าว (khao pai kin khao, [kʰǎw paj kin kʰâːw]) He went out to eat, literally He go eat rice
• ฉันฟังไม่เข้าใจ (chan fang mai khao chai, [tɕ͡ʰǎn faŋ mâj kʰâw tɕ͡aj]) I don't understand what was said, literally I listen not understand
• เข้ามา (khao ma, [kʰâw maː]) Come in, literally enter come
• ออกไป! (ok pai, [ʔɔ̀ːk paj]) Leave! or Get out!, literally exit go

Nouns

Nouns are uninflected and have no gender; there are no articles. Thai nouns are bare nouns and can be interpreted as singular, plural, definite or indefinite. Some specific nouns are reduplicated to form collectives: เด็ก (dek, child) is often repeated as เด็ก ๆ (dek dek) to refer to a group of children. The word พวก (phuak, [pʰûak]) may be used as a prefix of a noun or pronoun as a collective to pluralize or emphasise the following word. (พวกผม, phuak phom, [pʰûak pʰǒm], we, masculine; พวกเรา phuak rao, [pʰûak raw], emphasised we; พวกหมา phuak ma, (the) dogs). Plurals are expressed by adding classifiers, used as measure words (ลักษณนาม), in the form of noun-number-classifier (ครูห้าคน khru ha khon, "teacher five person" for "five teachers"). While in English, such classifiers are usually absent ("four chairs") or optional ("two bottles of beer" or "two beers"), a classifier is almost always used in Thai (hence "chair four item" and "beer two bottle").

Possession in Thai is indicated by adding the word ของ (khong) in front of the noun or pronoun, but it may often be omitted. For example:

• ลูกของแม่ (luk khong mae) = "child belonging to mother" English = mother's child
• นาอา (na a) = "field uncle" English = uncle's field

Nominal Phrases

Nominal phrases in Thai often use a special class of words classifiers. As previously mentioned, these classifiers are obligatory for noun phrases containing numerals e.g ผู้หญิงสองคน (phuying song khon, [pʰuːjiŋ sɔːŋ kʰon], two women). In the previous example khon acts as the classifier in the nominal phrase. This follows the form of noun-cardinal-classifier mentioned above. Classifiers are also required to form quantified noun phrases in Thai with some quantifiers such as ทุก(all), บาง(some). The examples below are demonstrated using the classifier khon, which is used for people.

• นักเรียนทุกคน (nak rian thuk khon). Literally "student every (classifier) = every student"
• ครูบางคน (khru bang khon). " teacher some (classifier)".

However, classifiers are not utilized for negative quantification. Negative quantification is expressed by the pattern ไม่มี (mai mi, [majmiː]) + NOUN. Classifiers are also used for demonstratives such as นี้ (ni, this/these) and นั่น (nan, that/those). The syntax for demonstrative phrases, however, differ from that of cardinals and follow the pattern noun-classifier-demonstrative. For example, the noun phrase "this dog" would be expressed in Thai as หมาตัวนี้ (lit. dog (classifier) this). Classifiers in Thai

Pronouns

Subject pronouns are often omitted, with nicknames used where English would use a pronoun. See Thai names#Formal and informal names for more details. Pronouns, when used, are ranked in honorific registers, and may also make a T–V distinction in relation to kinship and social status. Specialised pronouns are used for royalty, and for Buddhist monks. The following are appropriate for conversational use:

Word	RTGS	IPA	Meaning
ผม	phom	[pʰǒm]	I/me (masculine; formal)
ดิฉัน	dichan	[dìʔt͡ɕʰán])	I/me (feminine; formal)
ฉัน	chan	[t͡ɕʰǎn]	I/me (mainly used by women; informal) Commonly pronounced as [t͡ɕʰán]
กู	ku	[kū]	I/me (informal/impolite)
เรา	rao	[raw]	we/us, I/me (casual), you (sometimes used but only when older person speaks to younger person)
คุณ	khun	[kʰun]	you (polite)
ท่าน	than	[tʰân]	you (highly honorific)
เธอ	thoe	[tʰɤː]	you (informal), she/her (informal)
พี่	phi	[pʰîː]	older brother, sister (also used for older acquaintances)
น้อง	nong	[nɔːŋ]	younger brother, sister (also used for younger acquaintances)
เขา	khao	[kʰǎw]	he/him, she/her
มัน	man	[man]	it, he/she (sometimes casual or offensive if used to refer to a person)

The reflexive pronoun is ตัวเอง (tua eng), which can mean any of: myself, yourself, ourselves, himself, herself, themselves. This can be mixed with another pronoun to create an intensive pronoun, such as ตัวผมเอง (tua phom eng, lit: I myself) or ตัวคุณเอง (tua khun eng, lit: you yourself). Thai also does not have a separate possessive pronoun. Instead, possession is indicated by the particle ของ (khong). For example, "my mother" is แม่ของผม (mae khong phom, lit: mother of I). This particle is often implicit, so the phrase is shortened to แม่ผม (mae phom). Plural pronouns can be easily constructed by adding the word พวก (phuak) in front of a singular pronoun as in พวกเขา (phuak khao) meaning they or พวกเธอ (phuak thoe) meaning the plural sense of you. The only exception to this is เรา (rao), which can be used as singular (informal) or plural, but can also be used in the form of พวกเรา (phuak rao), which is only plural.

Thai has many more pronouns than those listed above. Their usage is full of nuances. For example:

• "ผม เรา ฉัน ดิฉัน หนู กู ข้า กระผม ข้าพเจ้า กระหม่อม อาตมา กัน ข้าน้อย ข้าพระพุทธเจ้า อั๊ว เขา" all translate to "I", but each expresses a different gender, age, politeness, status, or relationship between speaker and listener.
• เรา (rao) can be first person (I), second person (you), or both (we), depending on the context.
• Children or younger female could use or being referred by word หนู (nu) when talking with older person. The word หนู could be both feminine first person (I) and feminine second person (you) and also neuter first and neuter second person for children.
  • หนู commonly means rat or mouse, though it also refers to small creatures in general.
• The second person pronoun เธอ (thoe) (lit: you) is semi-feminine. It is used only when the speaker or the listener (or both) are female. Males usually don't address each other by this pronoun.
• Both คุณ (khun) and เธอ (thoe) are polite neuter second person pronouns. However, คุณเธอ (khun thoe) is a feminine derogative third person.
• Instead of a second person pronoun such as "คุณ" (you), it is much more common for unrelated strangers to call each other "พี่ น้อง ลุง ป้า น้า อา ตา ยาย" (brother/sister/aunt/uncle/granny).
• To express deference, the second person pronoun is sometimes replaced by a profession, similar to how, in English, presiding judges are always addressed as "your honor" rather than "you". In Thai, students always address their teachers by "ครู" or "คุณครู" or "อาจารย์" (each means "teacher") rather than คุณ (you). Teachers, monks, and doctors are almost always addressed this way.

Particles

The particles are often untranslatable words added to the end of a sentence to indicate respect, a request, encouragement or other moods (similar to the use of intonation in English), as well as varying the level of formality. They are not used in elegant (written) Thai. The most common particles indicating respect are ครับ (khrap, [kʰráp], with a high tone) when the speaker is male, and ค่ะ (kha, [kʰâ], with a falling tone) when the speaker is female. Used in a question or a request, the particle ค่ะ (falling tone) is changed to a คะ (high tone).

Other common particles are:

Word	RTGS	IPA	Meaning
จ๊ะ	cha/ja	[t͡ɕáʔ]	indicating a request
จ้ะ, จ้า or จ๋า	cha/ja	[t͡ɕâː]	indicating emphasis
ละ or ล่ะ	la	[láʔ]	indicating emphasis
สิ	si	[sìʔ]	indicating emphasis or an imperative
นะ	na	[náʔ]	softening; indicating a request

Register

Central Thai is composed of several distinct registers, forms for different social contexts:

• Street or Common Thai (ภาษาพูด, phasa phut, spoken Thai): informal, without polite terms of address, as used between close relatives and friends.
• Elegant or Formal Thai (ภาษาเขียน, phasa khian, written Thai): official and written version, includes respectful terms of address; used in simplified form in newspapers.
• Rhetorical Thai: used for public speaking.
• Religious Thai: (heavily influenced by Sanskrit and Pāli) used when discussing Buddhism or addressing monks.
• Royal Thai (ราชาศัพท์, racha sap): influenced by Khmer, this is used when addressing members of the royal family or describing their activities. (See Monarchy of Thailand § Rachasap.)

Most Thais can speak and understand all of these contexts. Street and Elegant Thai are the basis of all conversations. Rhetorical, religious, and royal Thai are taught in schools as part of the national curriculum.

As noted above, Thai has several registers, each having certain usages, such as colloquial, formal, literary, and poetic. Thus, the word "eat" can be กิน (kin; common), แดก (daek; vulgar), ยัด (yat; vulgar), บริโภค (boriphok; formal), รับประทาน (rapprathan; formal), ฉัน (chan; religious), or เสวย (sawoei; royal), as illustrated below:

"to eat"	IPA	Usage	Note
กิน	/kīn/	common
แดก	/dɛ̀ːk/	vulgar
ยัด	/ját/	vulgar	Original meaning is 'to cram'
บริโภค	/bɔ̄ː.ri.pʰôːk/	formal, literary
รับประทาน	/ráp.pra.tʰāːn/	formal, polite	Often shortened to ทาน /tʰāːn/.
ฉัน	/t͡ɕʰǎn/	religious
เสวย	/sa.wɤ̌ːj/	royal

Thailand also uses the distinctive Thai six-hour clock in addition to the 24-hour clock.

Vocabulary

Main article: List of loanwords in Thai

Other than compound words and words of foreign origin, most words are monosyllabic.

Chinese-language influence was strong until the 13th century when the use of Chinese characters was abandoned, and replaced by Sanskrit and Pali scripts. However, the vocabulary of Thai retains many words borrowed from Middle Chinese.

Later most vocabulary was borrowed from Sanskrit and Pāli; Buddhist terminology is particularly indebted to these. Indic words have a more formal register, and may be compared to Latin and French borrowings in English. Old Khmer has also contributed its share, especially in regard to royal court terminology. Since the beginning of the 20th century, however, the English language has had the greatest influence, especially for scientific, technical, international, and other modern terms.

Origin	Example	IPA	Gloss
Native Tai	ไฟ น้ำ เมือง รุ่งเรือง	/fāj/ /náːm/ /mɯ̄əŋ/ /rûŋ.rɯ̄əŋ/	fire water city prosperous
Indic sources: Pali or Sanskrit	อัคนี ชล นคร วิโรจน์	/ʔāk.kʰa.nīː/ /t͡ɕōn/ /náʔ.kʰɔ̄ːn/ /wíʔ.rôːt/	fire water city prosperous

Arabic-origin

Arabic words	Thai rendition	IPA	Gloss
الْقُرْآن (al-qurʾān) or قُرْآن (qurʾān)	อัลกุรอาน or โกหร่าน	/an.kù.rá.aːn/ or /kō.ràːn/	Quran
رجم (rajm)	ระยำ	/rá.jam/	bad, vile (pejorative)

Chinese-origin

From Middle Chinese or Teochew Chinese.

Chinese words	Thai rendition	IPA	Gloss
交椅 (teochew: gao1 in2)	เก้าอี้	/kâw.ʔîː/	chair
粿條 / 粿条 (min nan: kóe-tiâu)	ก๋วยเตี๋ยว	/kǔəj.tǐəw/	rice noodle
姐 (hokkien: chiá/ché, teochew: zê2/zia2)	เจ้ or เจ๊	/t͡ɕêː/ or /t͡ɕéː/	older sister (used in Chinese community in Thailand)
二 (hokkien: jī, teochew: ri6)	ยี่	/jîː/	two (archaic), but still used in word ยี่สิบ (/jîː.sìp/; twenty)
豆 (middle chinese: dəuH)	ถั่ว	/tʰùə/	bean
盎 (middle chinese: ʔɑŋX/ʔɑŋH)	อ่าง	/ʔàːŋ/	basin
膠 (middle chinese: kˠau)	กาว	/kāːw/	glue
鯁 (middle chinese: kˠæŋX)	ก้าง	/kâːŋ/	fishbone
坎 (middle chinese: kʰʌmX)	ขุม	/kʰǔm/	pit
塗 (middle chinese: duo/ɖˠa)	ทา	/tʰāː/	to smear
退 (middle chinese: tʰuʌiH)	ถอย	/tʰɔ̌j/	to step back

English-origin

English words	Thai rendition	IPA	Remark
bank	แบงก์	/bɛ́ːŋ/	means bank or banknote
bill	บิล	/biw/ or /bin/
cake	เค้ก	/kʰéːk/
captain	กัปตัน	/kàp.tān/
cartoon	การ์ตูน	/kāː.tūːn/
clinic	คลินิก	/kʰlīː.nìk/
computer	คอมพิวเตอร์	/kʰɔ̄m.pʰíw.tɤ̂ː/	colloquially shortened to คอม /kʰɔ̄m/
corruption	คอรัปชั่น	/kʰɔː.ráp.tɕʰân/
diesel	ดีเซล	/dīː.sēn/
dinosaur	ไดโนเสาร์	/dāi.nōː.sǎu/
duel	ดวล	/dūən/
email	อีเมล	/ʔīː.mēːw/
fashion	แฟชั่น	/fɛ̄ː.t͡ɕʰân/
golf	กอล์ฟ	/kɔ́ːp/
government	กัดฟันมัน	/kàt.fān.mān/	(obsolete)
graph	กราฟ	/kráːp/ or /káːp/
plastic	พลาสติก	/pʰláːt.sà.tìk/	(educated speech)
		/pʰát.tìk/
quota	โควตา	/kwōː.tâː/
shampoo	แชมพู	/t͡ɕʰɛ̄m.pʰūː/
suit	สูท	/sùːt/
suite	สวีท	/sà.wìːt/
taxi	แท็กซี่	/tʰɛ́k.sîː/
technology	เทคโนโลยี	/tʰék.nōː.lōː.jîː/
titanium	ไทเทเนียม	/tʰāj.tʰēː.nîəm/
visa	วีซ่า	/wīː.sâː/
wreath	(พวง)หรีด	/rìːt/

French-origin

French words	Thai rendition	IPA	Remark
aval	อาวัล	/ʔāː.wān/
buffet	บุฟเฟต์	/búp.fêː/
café	คาเฟ่	/kāː.fɛ̄ː/
chauffeur	โชเฟอร์	/t͡ɕʰōː.fɤ̀ː/
consul	กงสุล	/kōŋ.sǔn/
coupon	คูปอง	/kʰūː.pɔ̄ŋ/
pain	(ขนม)ปัง	/pāŋ/	means bread
parquet	ปาร์เกต์	/pāː.kêː/
pétanque	เปตอง	/pēː.tɔ̄ŋ/

Khmer-origin

From Old Khmer.

Khmer words	Thai rendition	IPA	Gloss
ក្រុង (grong)	กรุง	/krūŋ/	capital city
ខ្ទើយ (ktəəy)	กะเทย	/kà.tɤ̄ːj/	Kathoey
ច្រមុះ (chrâmuh)	จมูก	/t͡ɕà.mùːk/	nose
ច្រើន (craən)	เจริญ	/t͡ɕà.rɤ̄ːn/	prosperous
ឆ្លាត/ឆ្លាស (chlāt)	ฉลาด	/t͡ɕʰà.làːt/	smart
ថ្នល់ (thenâl)	ถนน	/tʰà.nǒn/	road
ភ្លើង (pləəŋ)	เพลิง	/pʰlɤ̄ːŋ/	fire
ទន្លេ (tonle)	ทะเล	/tʰá.lēː/	sea

Portuguese-origin

The Portuguese were the first Western nation to arrive in what is modern-day Thailand in the 16th century during the Ayutthaya period. Their influence in trade, especially weaponry, allowed them to establish a community just outside the capital and practice their faith, as well as exposing and converting the locals to Christianity. Thus, Portuguese words involving trade and religion were introduced and used by the locals.

Portuguese words	Thai rendition	IPA	Gloss
carta / cartaz	กระดาษ	/krà.dàːt/	paper
garça	(นก)กระสา	/krà.sǎː/	heron
leilão	เลหลัง	/lēː.lǎŋ/	auction or low-priced
padre	บาท(หลวง)	/bàːt.lǔaŋ/	(Christian) priest
real	เหรียญ	/rǐan/	coin
sabão	สบู่	/sà.bùː/	soap

Writing system

Main articles: Thai script and Thai braille

"Kingdom of Thailand" in Thai script.

Thai is written in the Thai script, an abugida written from left to right. Many scholars believe that it is derived from the Khmer script. Certainly the numbers were lifted directly from Khmer. The language and its script are closely related to the Lao language and script. Most literate Lao are able to read and understand Thai, as more than half of the Thai vocabulary, grammar, intonation, vowels and so forth are common with the Lao language.

The Thais adopted and modified the Khmer script to create their own writing system. While in Thai the pronunciation can largely be inferred from the script, the orthography is complex, with silent letters to preserve original spellings and many letters representing the same sound. While the oldest known inscription in the Khmer language dates from 611 CE, inscriptions in Thai writing began to appear around 1292 CE. Notable features include:

1. It is an abugida script, in which the implicit vowel is a short /a/ in a syllable without final consonant and a short /o/ in a syllable with final consonant.
2. Tone markers, if present, are placed above the final onset consonant of the syllable.
3. Vowels sounding after an initial consonant can be located before, after, above or below the consonant, or in a combination of these positions.

Transcription

Main article: Romanization of Thai

There is no universally applied method for transcribing Thai into the Latin alphabet. For example, the name of the main airport is transcribed variously as Suvarnabhumi, Suwannaphum, or Suwunnapoom. Guide books, textbooks and dictionaries may each follow different systems. For this reason, most language courses recommend that learners master the Thai script.

Official standards are the Royal Thai General System of Transcription (RTGS), published by the Royal Institute of Thailand, and the almost identical ISO 11940-2 defined by the International Organization for Standardization. The RTGS system is increasingly used in Thailand by central and local governments, especially for road signs. Its main drawbacks are that it does not indicate tone or vowel length. As the system is based on pronunciation, not orthography, reconstruction of Thai spelling from RTGS romanisation is not possible.

Transliteration

Main article: Thai transliteration

The ISO published an international standard for the transliteration of Thai into Roman script in September 2003 (ISO 11940). By adding diacritics to the Latin letters it makes the transcription reversible, making it a true transliteration. Notably, this system is used by Google Translate, although it does not seem to appear in many other contexts, such as textbooks and other instructional media.

See also

• Thai alphabet
• Thai honorifics
• Thai literature
• Thai numerals

References

Sources

• อภิลักษณ์ ธรรมทวีธิกุล และ กัลยารัตน์ ฐิติกานต์นารา. 2549.การเน้นพยางค์กับทำนองเสียงภาษาไทย (Stress and Intonation in Thai ) วารสารภาษาและภาษาศาสตร์ ปีที่ 24 ฉบับที่ 2 (มกราคม – มิถุนายน 2549) หน้า 59–76. ISSN 0857-1406 ISSN 2672-9881.
• สัทวิทยา : การวิเคราะห์ระบบเสียงในภาษา. 2547. กรุงเทพฯ : สำนักพิมพ์มหาวิทยาลัยเกษตรศาสตร์. ISBN 974-537-499-7.
• Diller, Anthony van Nostrand, et al. 2008. The Tai–Kadai Languages. ISBN 978-070-071-457-5.
• Gandour, Jack, Tumtavitikul, Apiluck and Satthamnuwong, Nakarin. 1999. Effects of Speaking Rate on the Thai Tones. Phonetica 56, pp. 123–134.
• Li, Fang-Kuei. A handbook of comparative Tai. Honolulu: University Press of Hawaii, 1977. Print.
• Rischel, Jørgen. 1998. 'Structural and Functional Aspects of Tone Split in Thai'. In Sound structure in language, 2009.
• Tumtavitikul, Apiluck, 1998. The Metrical Structure of Thai in a Non-Linear Perspective. Papers presented to the Fourth Annual Meeting of the Southeast Asian Linguistics Society 1994, pp. 53–71. Udom Warotamasikkhadit and Thanyarat Panakul, eds. Temple, Arizona: Program for Southeast Asian Studies, Arizona State University.
• Apiluck Tumtavitikul. 1997. The Reflection on the X′ category in Thai. Mon–Khmer Studies XXVII, pp. 307–316.
• อภิลักษณ์ ธรรมทวีธิกุล. 2539. ข้อคิดเกี่ยวกับหน่วยวากยสัมพันธ์ในภาษาไทย วารสารมนุษยศาสตร์วิชาการ. 4.57-66. ISSN 0859-3485 ISSN 2673-0502.
• Tumtavitikul, Appi. 1995. Tonal Movements in Thai. The Proceedings of the XIIIth International Congress of Phonetic Sciences, Vol. I, pp. 188–121. Stockholm: Royal Institute of Technology and Stockholm University.
• Tumtavitikul, Apiluck. 1994. Thai Contour Tones. Current Issues in Sino-Tibetan Linguistics, pp. 869–875. Hajime Kitamura et al., eds, Ozaka: The Organization Committee of the 26th Sino-Tibetan Languages and Linguistics, National Museum of Ethnology.
• Tumtavitikul, Apiluck. 1993. FO – Induced VOT Variants in Thai. Journal of Languages and Linguistics, 12.1.34 – 56.
• Tumtavitikul, Apiluck. 1993. Perhaps, the Tones are in the Consonants? Mon–Khmer Studies XXIII, pp. 11–41.
• Higbie, James and Thinsan, Snea. Thai Reference Grammar: The Structure of Spoken Thai. Bangkok: Orchid Press, 2003. ISBN 974-8304-96-5.
• Nacaskul, Karnchana, Ph.D. (ศาสตราจารย์กิตติคุณ ดร.กาญจนา นาคสกุล) Thai Phonology, 4th printing. (ระบบเสียงภาษาไทย, พิมพ์ครั้งที่ 4) Bangkok: Chulalongkorn Press, 1998. ISBN 978-974-639-375-1.
• Nanthana Ronnakiat, Ph.D. (ดร.นันทนา รณเกียรติ) Phonetics in Principle and Practical. (สัทศาสตร์ภาคทฤษฎีและภาคปฏิบัติ) Bangkok: Thammasat University, 2005. ISBN 974-571-929-3.
• Segaller, Denis. Thai Without Tears: A Guide to Simple Thai Speaking. Bangkok: BMD Book Mags, 1999. ISBN 974-87115-2-8.
• Smyth, David (2002). Thai: An Essential Grammar, first edition. London: Routledge.
• Smyth, David (2014). Thai: An Essential Grammar, second edition. London: Routledge. ISBN 978-041-551-034-9.
• Tingsabadh, M.R. Kalaya; Abramson, Arthur (1993), "Thai", Journal of the International Phonetic Association, 23 (1): 24–28, doi:10.1017/S0025100300004746

Further reading

• Inglis, Douglas. 1999. Lexical conceptual structure of numeral classifiers in Thai-Part 1. Payap Research and Development Institute and The Summer Institute of Linguistics. Payap University.
• Inglis, Douglas. 2000. Grammatical conceptual structure of numeral classifiers in Thai-Part 2. Payap Research and Development Institute and The Summer Institute of Linguistics. Payap University.
• Inglis, Douglas. 2003. Conceptual structure of numeral classifiers in Thai. In Eugene E. Casad and Gary B. Palmer (eds.). Cognitive linguistics and non-Indo-European languages. CLR Series 18. De Gruyter Mouton. 223–246. ISBN 978-311-017-371-0

External links

• IPA and SAMPA for Thai
• Consonant Ear Training Tape
• Tones of Tai Dialect

Glossaries and word lists

• Thai phrasebook from Wikivoyage
• Thai Swadesh list of basic vocabulary words (from Wiktionary's Swadesh-list appendix)

Dictionaries

• English–Thai Dictionary: English–Thai bilingual online dictionary
• The Royal Institute Dictionary, official standard Thai–Thai dictionary
• Longdo Thai Dictionary LongdoDict
• Thai-English dictionary
• Thai2english.com: LEXiTRON-based Thai–English dictionary
• Daoulagad Thai: mobile OCR Thai–English dictionary
• Thai dictionaries for Stardict/GoldenDict - Thai - English (also French, German, Italian, Russian, Chinese and others) dictionaries in Stardict and GoldenDict formats
• Volubilis Dictionary VOLUBILIS (Romanized Thai - Thai - English - French) : free databases (ods/xlsx) and dictionaries (PDF) - Thai transcription system.

Learners' resources

• thai-language.com English speakers' online resource for the Thai language
• Say Hello in the Thai Language
• FSI Thai language course (Formerly at thailanguagewiki.com)
• Spoken Thai (30 exercises with audio)