Germanic strong verb

In the Germanic languages, a strong verb is one which marks its past tense by means of changes to the stem vowel (ablaut). The majority of the remaining verbs form the past tense by means of a dental suffix (e.g. -ed in English), and are known as weak verbs. (A third, much smaller, class comprises the preterite-present verbs, which are continued in the English auxiliary verbs, e.g. can/could, shall/should, may/might, must.) In modern English, strong verbs are verbs such as sing, sang, sung or drive, drove, driven, as opposed to weak verbs such as open, opened, opened or hit, hit, hit. The "strong" vs. "weak" terminology was coined by the German linguist Jacob Grimm, and the terms "strong verb" and "weak verb" are direct translations of the original German terms "starkes Verb" and "schwaches Verb".

In Proto-Germanic, strong and weak verbs were clearly distinguished from each other in their conjugation, and the strong verbs were grouped into seven coherent classes. Originally, the strong verbs were largely regular, and in most cases all of the principal parts of a strong verb could be reliably predicted from the infinitive. This system was continued largely intact in Old English and the other older historical Germanic languages, e.g. Gothic, Old High German and Old Norse. The coherency of this system is still present in modern German and some of the other conservative modern Germanic languages. For example, in German, strong verbs are consistently marked with a past participle in -en, while weak verbs have a past participle in -t. In English, however, the original regular strong conjugations have disintegrated, with the result that in modern English grammar, the distinction between strong and weak verbs is much less useful than a distinction between "regular" and "irregular" verbs. The irregular verbs include all the strong verbs, but many weak verbs as well. For example, the verb hold, held, held continues a strong verb, whereas tell, told, told and lead, led, led continue weak verbs, but to a modern speaker without knowledge of the relevant history, the distinction between the two types appears arbitrary.

Conjugation

As an example of the conjugation of a strong verb, we may take the Old English class 2 verb bēodan, "to command" (cf. English "bid").

This has the following forms:

Infinitive	Supine	Present Indicative	Present Subjunctive	Past Indicative	Past Subjunctive	Imperative mood	Past participle
bēodan	tō bēodenne	ic bēode þū bīetst hē bīett wē bēodað gē bēodað hīe bēodað	ic bēode þū bēode hē bēode wē bēoden gē bēoden hīe bēoden	ic bēad þū bude hē bēad wē budon gē budon hīe budon	ic bude þū bude hē bude wē buden gē buden hīe buden	- bēode! – – bēodað!, bēode gē! –	geboden

While the inflections are more or less regular, the vowel changes in the stem are not predictable without an understanding of the Indo-European ablaut system, and students have to learn the principal parts by heart: bēodan, bīett, bēad, budon, boden. The five principal parts are:

1. The infinitive: bēodan. The same vowel is used through most of the present tense.
2. The present tense 3rd singular: bīett. The same vowel is used in the 2nd singular.
3. The preterite 1st singular (from the PIE perfect): bēad, which is identical to the 3rd singular.
4. The preterite plural: budon. The same vowel is used in the 2nd singular.
5. The past participle (from the PIE verbal noun): boden. This vowel is used only in the participle.

Strictly speaking, in this verb ablaut causes only a threefold distinction: parts 1 and 2 are from the e-grade, part 3 from the o-grade, and parts 4 and 5 from the zero grade. The other two distinctions are caused by different kinds of regressive metaphony: part 2, when it is distinct at all, is always derived from part 1 by Umlaut. In some verbs, part 5 is a discrete ablaut grade, but in this class 2 verb it is derived from part 4 by an a-mutation.

Verb classes

Six different ablaut sequences (German: Ablautreihen) exist in the Germanic languages. These are referred to as the six classes in which the strong verbs can be subdivided.

In PIE there were already several possible ablaut sequences in the verb conjugation. The Germanic verb is based on the following four patterns. (For orientation, the numbers of the Germanic principal parts and verb classes are included in this table, but the vowels are those of the unattested but reconstructed PIE).

	Present (Parts 1&2)	Perfect singular (Part 3)	Perfect plural (Part 4)	Verbal noun / past participle (Part 5)	Class Inspired into Germanic
Standard Pattern	e	o	zero	zero	Classes 1–3
Substitution of zero grade	e	o	ē	zero	Class 4
	e	o	ē	e	Class 5
Predominant a-vowel	a	ō	ō	a	Class 6

The standard pattern of PIE is best represented in Germanic by class 3. Classes 1 & 2 have also developed out of this pattern, but here the ablaut vowel was followed by a semivowel (i/j and u/v respectively) which later combined with it to form a diphthong. The PIE variations from which Germanic classes 4 & 5 evolved contain consonant structures which were partly or wholly incompatible with the zero grade, and thus the e-grade and lengthened e-grade were substituted in one or both of the zero grade positions. Thus classes 1-5 are all easily explicable as having developed logically from a single basic pattern.

Class 6 is more problematic. It is a controversial question whether the earlier phases of PIE had an a-vowel at all. At any rate, most occurrences of an /a/ in late PIE are associated with an earlier laryngeal h₂. Opinions still vary about how exactly this worked, but it is conceivable, for example, that the present stem could have experienced the shift h₂e → a. If this is so, then class 6 may also be a variation on the standard pattern.

In addition to the six ablaut sequences, Germanic originally had reduplicating verbs, which in the West and North Germanic languages have lost their reduplication and simplified into a relatively coherent group which may be thought of as a seventh class. However, some verbs, most notably the ri-verbs, retained at least partial reduplication in some languages. In Gothic, reduplication remained in full.

The Anglo-Saxon scholar Henry Sweet gave names to the seven classes (the "drive conjugation", the "choose conjugation" etc), but normally they are simply referred to by numbers.

General developments

Before looking at the seven classes individually it is helpful to consider first the general developments which affected all of them. The following phonological changes are relevant for the discussion of the ablaut system:

From PIE to Germanic

• General sound shifts: o > a ; ei > ī ; oi > ai ; ou > au.
• Elimination of the zero grade before liquids by insertion of u.
• The development of grammatischer Wechsel (variations in the consonant following the ablaut vowel) caused by Verner's law.
• Umlaut - the fronting of the ablaut vowel e to i, caused by i, ī or j in the following syllable. This affects the 2nd and 3rd persons singular of the present tense in classes 2, 3b, 4 and 5.
• Wandel - the same effect as Umlaut, but caused by a nasal or other front consonant in post-vocalic position. This affects the whole of the present stem (including the infinitive) of some verbs in class 3a, and of a few verbs in class 2.

From Germanic to Gothic

• Merger of i and e: e > i in all environments
• High vowel lowering before r, h: i > e (spelled <ai>), u > o (spelled <au>)
• ī was spelled <ei>

From Germanic to the north and west Germanic dialects

• Extension of umlaut to back vowels, causing it to apply also to verbs of class 6.
• a-mutation (sometimes wrongly called a-umlaut) - the movement of the ablaut vowel towards the back of the mouth caused by an a in the following syllable. This affects the participle, which had the suffix -an. An intervening nasal + consonant blocked this.

From Germanic to Old English

• General sound shifts: ai > ā ; eu > ēo ; au > ēa
• Breaking before certain consonants: a > ea ; e > eo
• "West Saxon Palatalisation": i > ie after g

From Old English to Modern English

• Great Vowel Shift

From Germanic to Old High German

• General sound shifts: ai > ei ; au > ou
• Sound shift e > i before u
• Old High German monophthongization: ei > ē before Germanic r, h and w; ou > ō before Germanic dentals (þ, d, t, n, l, s, z, r) and h

From Old High German to Modern German

• General sound shifts: io > ī (spelled <ie>) ; ou > au
• MHG diphthongisation: ī > ai (spelled <ei>), ū > au, ȳ > ɔy (spelled <eu> or <äu>)
• vowel lengthening in early modern times: i > ī (spelled <ie>) before a single consonant.

From Germanic to early Middle Dutch

• General sound shifts: ai > ē ; au > ō, eu > io > ie, ē2 > ie, ō > ue (usually spelled <oe>)
• Sound shifts u > o, ū > ȳ
• Lengthening of vowels in open syllables: e > ē, o > ō, a > ā, but not written. i is lengthened to ē.

From Middle Dutch to Modern Dutch

• Diphthongisation of long high vowels: ī > ei (spelled <ij>), ȳ > œy (spelled <ui>)
• Monophthongisation of opening diphthongs: ie > i (still spelled <ie>), ue > u (spelled <oe>)

From early Modern Dutch to Afrikaans

• The distinction between strong and weak verbs has been lost in Afrikaans, as all verbs now follow the weak pattern. For example the ancestral Dutch hij heeft gezongen has become hy het gesing ("he sang/has sung/had sung). "He sings" is hy sing; there is no change in vowel sound and it follows the same pattern as hy werk (he works), hy het gewerk (he worked/has worked/had worked). Afrikaans has even lost the inflection that distinguishes the present from the infinitive form of the verb in Dutch.

Other changes in the general shape of the verbs:

• Between PIE and Germanic the verbal noun was adapted as a past participle for the new Germanic synthetic tenses. The emphatic prefix ge- came to be used (but neither exclusively nor invariably) as a marker of the participle. In English this prefix disappeared again in the Middle Ages.
• The development of weak verbs in Germanic meant that the strong verb system ceased to be productive. Practically all new verbs were weak. Gradually many strong verbs became weak, so that the total number of strong verbs in the languages was constantly decreasing. In English, this process has gone further than it has in German or Dutch; one example is the verb to help which used to be conjugated holp-holpen. The reverse phenomenon, whereby a weak verb thus becomes strong by analogy, is rather rare. Some verbs, which might be termed "semi-strong", have formed a weak preterite but retained the strong participle, or rarely vice versa. This type of verb is most common in Dutch:

lachen lachte (formerly loech) gelachen ("to laugh")

vragen vroeg (formerly vraagde) gevraagd ("to ask")

• Idiosyncrasies of the phonological changes led to a growing number of subgroups. Also, once the ablaut system ceased to be productive, there was a decline in the speakers' awareness of the regularity of the system. This leads to anomalous forms. Thus the six big classes lost their cohesion. Again, this process is furthest advanced in English. The reverse process whereby anomalies are eliminated and subgroups reunited by the force of analogy is called "levelling", and can be seen at various points in the history of the verb classes.
• In the later Middle Ages, all three languages eliminated a great part of the old distinction between the vowels of the singular and plural preterite forms. The new uniform preterite could be based on the vowel of the old preterite singular, or on the old plural, or sometimes on the participle. In English, the distinction remains in the verb "to be": I was, we were. In Dutch, it remains in the verbs of classes 4 & 5 but only in vowel length: ik brak (I broke - short a), wij braken (we broke - long ā). In German and Dutch it also remains in the present tense of the preterite presents. In Limburgish there is a little more left. E.g. the preterite of to help is (weer) hólpe for the plural but either (ich) halp or (ich) hólp for the singular.
• In the process of development of English, numerous sound changes and analogical developments have fragmented the classes to the extent that most of them no longer have any coherence -- only classes 1, 3 and 4 still have significant subclasses that follow uniform patterns.

Class 1

Class 1, Sweet's "drive conjugation", represents all verbs in which the IE Ablaut-vowel was followed by an i. This combination is effectively a diphthong in PIE, or in the zero-grade, a simple i. Regular vowel shifts in Germanic change ei > ī and oi > ai. Metaphony does not affect class 1. Compare with Latin venio ("I come"): infinitive venire, perfect active indicative vēni, and future active participle venturus.

	Part 1	Part 2	Part 3	Part 4	Part 5
Proto Indo-European	réydʰ-	réydʰiti	reróydʰe	reridʰń̥d	ridʰó-
Proto Germanic	rīdaną	rīdidi	raid	ridun	ridanaz
Old English	rīdan	rītt	rād	ridon	riden
Old Saxon	rīdan	rīdid	rēd	ridun	giridan
Old High German	rītan	rītit	reit	ritun	giritan
Old Norse	ríða	ríðr	reið	riðu	riðinn
Gothic	dreiban	dreibiþ	draif	dribun	dribans

In Old English, Germanic ai becomes ā.

• rīdan rītt rād ridon riden ("to ride")
• wrītan wrītt wrāt writon writen ("to write")
• scīnan scīnt scān scinon scinen ("to shine")

Modern English has experienced a diphthongisation of ī (though it is still spelled with an i) and a shift ā > ō. The modern preterite is taken from either the old preterite singular or the old preterite plural (for bite and hide – in the case of the verb chide either can be used), and in the case of "shine", the past participle has also assimilated to the preterite singular.

• ride rode ridden
• write wrote written
• shine shone shone

Class 1 verbs in modern English (excluding derived verbs such as abide and override) are bide, bite, chide, drive, hide, ride, rise, shine, shrive, smite, stride, strike, strive, thrive, write. However, note that, although these verbs have uniformity in their infinitive vowel, they no longer form a coherent class in further inflected forms – for example, bite (bit, bitten), ride (rode, ridden), shine (shone, shone), and strike (struck, struck/stricken, with struck and stricken used in different meanings) all show different patterns from one another – but bide, drive, ride, rise, smite, stride, strive, write do form a (more or less) coherent subclass. Most of these verbs are descended from Old English class 1 verbs. However:

• The French loan-word strive (albeit descended from a Frankish class 1 verb) is class 1 by analogy to drive.
• Similarly, thrive is a class 1 verb formed by analogy to drive, its Old English ancestor being weak and descended from Old Norse þrífa (itself a class 1 strong verb, meaning "to grasp").
• hide is a class 1 verb whose Old English ancestor, hȳdan, was weak.

In addition, writhe is an English class 1 verb that has class 1 forms (wrothe, writhen) only in archaic usage.

For the principal parts of all English strong verbs see: Wiktionary appendix: Irregular English verbs.

In Old High German, Germanic ai becomes ei, and then by OHG monophthongisation it becomes ē before a velar consonant. Thus Old High German has two subclasses, depending on the vowel in the preterite singular:

• 1a rītan rītu reit ritum giritan ("to ride")
• 1b līhan līhu lēh ligum giligan ("to loan" - note grammatischer Wechsel.)

Like English, Modern German diphthongises the ī (spelling it ei). The modern language takes its preterite from the old preterite plural, so the distinction between the two subclasses disappears. However a new subdivision arises because the i of the past tense forms is lengthened to ie before a single consonant. As it happens, reiten and leihen serve as examples of this too, but many OHG 1a verbs are in the modern long vowel group.

• (short vowel) reiten ritt geritten ("to ride")
• (long vowel) leihen lieh geliehen ("to loan")

Class 1 verbs in modern German are:

• with short vowels: beißen, bleichen, gleichen, gleiten, greifen, leiden, pfeifen, reißen, reiten, scheißen, schleichen, schleifen, schleißen, schmeißen, schneiden, schreiten, spleißen, streichen, streiten, weichen (also the originally weak verb kneifen by analogy)
• with vowel lengthening: bleiben, gedeihen, leihen, meiden, reiben, scheiden, scheinen, schreiben, schreien, schweigen, speien, steigen, treiben, verzeihen, weisen (also the originally weak verb preisen by analogy).

In Dutch, class 1 has remained very regular, and follows the pattern:

• grijpen greep gegrepen

Class 1 verbs in Dutch are bezwijken, bijten, blijken, blijven, drijven, glijden, grijpen, hijsen, kijken, knijpen, krijgen, lijden, lijken, mijden, prijzen, rijden, rijzen, schijnen, schijten, schrijden, schrijven, slijpen, slijten, smijten, spijten, splijten, stijgen, strijden, strijken, verdwijnen, vermijden, wijken, wijzen, wrijven, zwijgen.

In Gothic:

• dreiban draif dribun dribans

Class 2

Class 2, Sweet's "choose conjugation", represents all verbs in which the IE Ablaut-vowel was followed by a u. In PIE it is therefore very similar to class 1. A regular vowel shift in Germanic changes ou > au. In two separate metaphonic processes, the present singular (part 2) is umlauted (eu > iu) because of an i in the inflection and the u in the past participle (part 5) is assimilated to the a in the inflection (u > o). A small number of verbs form a subgroup with ū in parts 1 and 2, for reasons which have not been entirely explained; this anomalous form may originate in Proto-Indo-European.

	Part 1	Part 2	Part 3	Part 4	Part 5
Proto Indo-European	préws-	préwsiti	peprówse	peprusń̥d	prusó-
Proto Germanic	freusaną	friusidi	fraus	fruzun	fruzanaz
Old English	frēosan	frīest	frēas	fruron	froren
Old Saxon	friosan	friusid	frōs	frurun	gifroran
Old High German	friosan	friusit	frōs	frurun	gifroran
Old Norse	frjósa	frýss	fraus	frusu	frosinn
Gothic	liugan	liugiþ	laug	lugun	lugans

	Part 1	Part 2	Part 3	Part 4	Part 5
Proto Indo-European	?	?	?	?	?
Proto Germanic	lūkaną	lūkidi	lauk	lukun	lukanaz
Old English	lūcan	lȳcþ	lēac	lucon	locen
Old Saxon	lūkan	lūkid	lōk	lukun	gilokan
Old High German	lūhhan	lūhhit	lōh	luhhun	gilohhan
Old Norse	lúka	lýkr	lauk	luku	lokinn
Gothic	lūkan	lūkiþ	lauk	lukun	lukans

In Old English, Germanic eu becomes ēo.

• scēotan scīett scēat scuton scoten ("to shoot")
• bēodan bīett bēad budon boden ("to command, bid")
• flēogan flīehþ flēag flugon flogen ("to fly")
• cēosan cīest cēas curon coren ("to choose" - note grammatischer Wechsel)

An Old English example with the present stem in ū:

• scūfan scŷfþ scēaf scufon scofen ("to shove")

In Modern English, this is a small group characterised by the o vowel of the participle being assimilated to the preterite:

• choose chose chosen
• fly flew flown

Class 2 verbs in Modern English are choose, cleave, dive (AE), fly, freeze, which do not form a coherent class, as each verb has different irregularities from each other verb.

In Old High German, the usual pattern is:

• biogan biugu boug bugum gibogan ("to bend")

An Old High German example with present stem in ū:

• sūfan siufu souf sufum gisofan ("to drink")

An example with wandel affecting the whole of the present stem.

• briuwan briuwu brou brūwum gibrūwan ("to brew")

A small group sometimes called class 2b has Old High German monophthongisation in the preterite singular:

• biotan biutu bōt butum gibotan ("to offer")

Regular shifts on the way to Modern German change io > ie and ou > o. The modern preterite is based on the OHG preterite singular:

• biegen bog gebogen ("to bend")
• schieben schob geschoben ("to shove")
• saugen sog gesogen ("to suck")

Class 2 verbs in Modern German are: biegen, bieten, fliegen, fliehen, fließen, frieren, genießen, gießen, klieben, kriechen, riechen, schieben, schießen, schließen, sprießen, stieben, verlieren, ziehen; with ū-present: saufen, saugen.

Two anomalous class 2 verbs in modern German are lügen ("to tell a lie") and trügen ("to deceive"). This no doubt arises from a desire to disambiguate Middle High German liegen from ligen (class 5), which would have sounded the same in Early Modern German. Trügen would have followed in its wake, because the two words form a common rhyming collocation.

In Dutch, class 2 follows the patterns

• bedriegen bedroog bedrogen ("to deceive")
• sluiten sloot gesloten ("to shut")

The present stem in ui represents the old ū-present, but interestingly this subgroup has grown, as a number of class 2 verbs which originally did not have ū-presents have taken the ui by analogy. Class 2 verbs in modern Dutch are: bedriegen, bieden, genieten, gieten, kiezen, liegen, schieten, verliezen, vliegen, vriezen; with ū-present: buigen, druipen, duiken, fluiten, kruipen, ruiken, schuilen, schuiven, sluiten, snuiven, spuiten, stuiven, zuigen, zuipen.

In Old Norse the past participle and plural present stem were subject to change due to assimilation.

In Gothic:

• biudan bauþ budun budans
• lūkan lauk lukun lukans

Class 3

Class 3, Sweet's "bind conjugation", represents all verbs in which the IE Ablaut-vowel was followed by a nasal (n) or a liquid (r/l) and another consonant. There are also a few cases where the vowel is followed, at least in Proto-Germanic, by two consonants, neither of which is a nasal or a liquid. So the combinations are:

• With nasals (class 3a): CVnC, CVnn, CVmC, CVmm
• With liquids (class 3b): CVlC, CVll, CVrC, CVhC

In the zero-grade forms, the nasal or liquid became a syllabic sonorant in PIE, transcribed as a circle below the letter. In Germanic, these syllabic nasals and liquids were not used, so a u vowel was added in compensation: l̥ > ul. Umlaut causes a shift e > i in the present singular, but in the case of the nasals, this shift takes place throughout the present stem: this is referred to as wandel - the same effect as umlaut, but triggered by the nasal consonant. The preterite singular shows the standard Germanic vowel shift o > a. In the participle, ul becomes ol through metaphony but only with the liquid, as the metaphony is blocked by the nasal.

	Part 1	Part 2	Part 3	Part 4	Part 5
Proto-Indo-European	bʰéndʰ-	bʰéndʰiti	bʰebʰóndʰe	bʰebʰn̥dʰń̥d	bʰn̥dʰó-
Proto Germanic	bindaną	bindidi	band	bundun	bundanaz
Old English	bindan	bindeþ	band	bundon	bunden
Old Saxon	bindan	bindid	band	bundun	bundan
Old High German	bintan	bintit	bant	buntun	buntan
Old Norse	binda	bindr	batt	bundu	bundinn
Gothic	bindan	bindiþ	band	bundun	bundans

	Part 1	Part 2	Part 3	Part 4	Part 5
Proto Indo-European	wért-	wértiti	wewórte	wewr̥tń̥d	wr̥tó-
Proto Germanic	werþaną	wirþidi	warþ	wurdun	wurdanaz
Old English	weorþan	wierþeþ	wearþ	wurdon	worden
Old Saxon	werthan	wirthid	warth	wurdun	giwordan
Old High German	werdan	wirdit	ward	wurtun	giwortan
Old Norse	verða	verðr	varð	urðu	orðinn
Gothic	wairþan	wairþiþ	warþ	waurþun	waurþans

In Old English, class 3a is little changed from Germanic.

• drincan drinceþ dranc druncon druncen ("to drink")
• bindan bindeþ band bundon bunden ("to bind")

Class 3b experiences a diphthongisation called "Brechung" in preterite singular (a > ea); before r and h this also affects the present stem (e > eo).

• helpan hilpþ healp hulpon holpen ("to help")
• delfan dilfþ dealf dulfon dolfen ("to dig, delve")
• sweltan swilt swealt swulton swolten ("to die, swelt")
• ceorfan cierfþ cearf curfon corfen ("to cut, carve")
• feohtan fieht feaht fuhton fohten ("to fight")

West Saxon palatal diphthongization causes i > ie after g:

• gieldan gieldeþ geald guldon golden ("to pay, yield")

Three verbs have an anomalous æ in preterite singular: berstan ("to burst"), bregdan ("to pull"), frignan ("to ask").

• berstan birst bærst burston borsten

In Modern English, this class is fairly large. This class is still relatively regular: the preterite is mostly formed from the OE preterite singular, occasionally from the preterite plural. Many of the verbs have two preterite forms, one of which may be dialectal or archaic (begin, drink, ring, shrink, sing, spring, stink, swing, swim and wring).

• drink drank drunk(en)
• sing sang sung

However, there are some anomalies. The class 3 verbs in modern English are:

• With nasal: begin, bind, cling, drink, find, fling, grind, ring, run, shrink, sing, sink, sling, slink, spin, spring, sting, stink, string, swing, swim, win, wind, wring
• With ll: swell
• With original "Germanic h": fight

English fling does not go back to Old English, and may be a loan-word from Norse. It seems to have adopted class 3 forms by analogy with cling etc. Similarly ring, string.

In Old High German, class 3 has its vowels unchanged from Germanic:

• bindan bindu band bundum gibundan
• helfan hilfu half hulfum giholfan

Modern German takes the preterite from the OHG preterite singular.

• binden band gebunden
• helfen (hilf) half geholfen

However, the o of the 3b participle has been passed by analogy to some 3a verbs, and also to the preterite of some verbs of both groups:

• beginnen begann begonnen
• bergen barg geborgen ("to rescue")
• quellen quoll gequollen ("to well up")

Class 3 verbs in modern German

• 3a regular (i-a-u): binden, dringen, finden, gelingen, klingen, ringen, schlingen, schwinden, schwingen, singen, sinken, springen, stinken, trinken, zwingen
• 3a with substitution of o in participle (i-a-o): beginnen, gewinnen, rinnen, schwimmen
• 3a with substitution of o in preterite and participle (i-o-o): glimmen, klimmen
• 3b regular (e-a-o): befehlen, bergen; bersten, gelten, helfen, schelten, sterben, verderben, werben, werden, werfen
• 3b with substitution of o in preterite (e-o-o): dreschen, fechten, flechten, quellen, schmelzen, schwellen

In Dutch, class 3a and the bulk of 3b have taken the vowel of the participle for the preterite. However, a small group of 3b verbs have developed a preterite in ie, perhaps by analogy with class 7. This gives the patterns:

• binden bond gebonden
• bergen borg geborgen ("to store")
• helpen hielp geholpen

A small number of verbs of other classes have taken the forms of class 3b by analogy. Class 3 verbs in modern Dutch are:

• 3a: beginnen, binden, blinken, dringen, drinken, dwingen, glimmen, klimmen, klinken, schrikken, springen, stinken, verzinnen, vinden, winnen, wringen, zingen, zinken.
• original 3b: bergen, gelden, schelden, smelten, vechten, zwellen.
• 3b by analogy (original class in brackets): schenken, scheren (4), treffen(4), trekken (6), wegen, zenden (3a), zwemmen (3a).
• 3b with preterite in ie: bederven, helpen, sterven, werpen, zwerven.

In Old Norse, numerous sound changes have resulted in this class fragmenting into 15 or so subclasses.

In Gothic:

• bindan band bundun bundans
• hilpan halp hulpun hulpans
• bairgan barg baurgun baurgans

Class 4

Class 4, Sweet's "Bear conjugation", represents all verbs in which the ablaut vowel was followed by a single nasal or liquid. The zero-grade in the participle becomes a u in Germanic, but, outside of Gothic, changes to o by a-mutation; as a single nasal is not enough to block this mutation, subgroups do not form in the Germanic class 4 as they do in class 3.

	Part 1	Part 2	Part 3	Part 4	Part 5
Proto Indo-European	bʰér-	bʰériti	bʰebʰóre	bʰebʰērń̥d	bʰr̥ó-
Proto Germanic	beraną	biridi	bar	bērun	buranaz
Old English	beran	birþ	bær	bǣron	boren
Old Saxon	beran	birid	bar	bārun	giboran
Old High German	beran	birit	bar	bārun	giboran
Old Norse	bera	berr	bar	báru	borinn
Gothic	bairan	bairiþ	bar	bērun	baurans

In Old English, the general pattern is:

• beran bierþ bær bǣron boren ("to bear")
• brecan bricþ bræc brǣcon brocen ("to break")

With West Saxon palatal diphthongization (after c, g):

• scieran scear scēaron scoren ("to shear")

The verb come is anomalous in all the West Germanic languages because it originally began with qu-, and the subsequent loss of the w sound coloured the vowel of the present stem.

• cuman cymþ cōm cōmon cumen ("to come")

Also anomalous:

• niman nimþ nōm nōmon numen ("to take")

In Modern English, regular class 4 verbs have all kept the –n in the participle, though eliminating the medial e after r, this class exhibits near homogeneity of vowel pattern:

• break broke broken

but several verbs have archaic preterites that preserve the "a" of Middle English (bare, brake, gat, spake or Scots spak, sware, and tare). The preterite of Middle English comen was either cam or com (or with -en in the plural).

Class 4 verbs in English (not including derivatives such as beget) are bear, break, get, shear, speak, steal, swear, tear, tread, wake, weave; and without the -n and of irregular vowel progression: come. Get, speak, tread and weave were originally of class 5, whereas swear were originally class 6. Wake was also originally class 6, and in fact retains the "a" of the present tense – the preterite woke (Middle English wook) only conforms to the modern class 4 preterite, not to the historic class 4 preterite in "a".

Although the verb to be is suppletive and highly irregular, its preterite follows the pattern of a class 4 strong verb, with grammatischer Wechsel, and in English and Dutch this verb has retained the singular/plural distinction of both ablaut grade and consonant in the modern languages. Old English: wæs/wǣron, English: was/were. For full paradigms and historical explanations see Indo-European copula.

In Old High German, the pattern is:

• neman nimu nam nāmum ginoman ("to take")

In Modern German the preterite is based on the preterite singular. As the only difference between the historical classes 3b and 4 was the preterite plural, these two classes are now identical.

• nehmen nahm genommen ("to take")

Kommen still has the anomalous o in the present stem (although some dialects still pronounce this as kemmen.)

• kommen kam gekommen ("to come")

Class 4 verbs in modern German: brechen, gebären, nehmen, schrecken, sprechen, stechen, stehlen, treffen; anomalous: kommen.

The preterite of sein ("to be") is Old High German: was/wârum, but levelled in modern German: war/waren.

In Dutch, class 4 and 5 verbs still show the distinction in vowel between the preterite singular and plural: ik nam ("I took") has the plural wij namen (not *nammen), that is, the 'short' vowel [ɑ] of the singular is replaced by the 'long' [a] in the plural. (Note the relationship of consonant doubling to vowel length, which is explained at Dutch orthography). The pattern is therefore:

• breken brak (braken) gebroken ("to break")

In the case of komen, the w is retained in the preterite.

• komen kwam (kwamen) gekomen ("to come")

Class 4 verbs in Dutch are: bevelen, breken, nemen, spreken, steken, stelen; and anomalous: komen.

The preterite of wezen/zijn ("to be") still shows both (quantitative) ablaut and grammatischer Wechsel between the singular and plural: was/waren.

In Gothic:

• qiman qam qēmun qumans
• brikan brak brēkun brukans

Class 5

Class 5, Sweet's "give conjugation", represents all verbs in which the IE Ablaut-vowel was followed by a single consonant other than a nasal or a liquid. This class is originally similar to class 4 except in the participle. There is also a small subgroup called "j-presents" which show umlaut throughout the whole of the present stem.

	Part 1	Part 2	Part 3	Part 4	Part 5
Proto Indo-European	lés-	lésiti	lelóse	lelēsń̥d	lesó-
Proto Germanic	lesaną	lisidi	las	lēzun	lezanaz
Old English	lesan	lisþ	læs	lǣron	leren
Old Saxon	lesan	lisid	las	lārun	gileran
Old High German	lesan	lisit	las	lārun	gileran
Old Norse	lesa	less	las	lásu	lesinn
Gothic	lisan	lisiþ	las	lēsun	lisans

In Old English the preterite is in æ/ǣ, as in class 4.

• sprecan spricþ spræc sprǣcon sprecen ("to speak")
• cweþan cwiþþ cwæþ cwǣdon cweden ("to say", cf. "bequeath", archaic past "quoth")

With West Saxon palatal diphthongization (after c, g)

• giefan geaf gēafon giefen ("to give")

With j-presents

• biddan bæd bǣdon beden

Contracted, anomalous:

• sēon sihþ seah sāwon sewen ("to see")

In Modern English this group has lost all group cohesion.

• eat ate eaten
• give gave given
• lie lay lain
• see saw seen
• sit sat sat

Class 5 verbs in Modern English: bid, eat, give, lie (= lie down), see, sit. Get, speak, tread, weave are now class 4.

The preterite of the verb forbid can be forbad or forbade, and the preterite ate is pronounced "et" in some British dialects.

In Old High German this group is relatively uniform. The model is geban, or for the j-presents, bitten.

• geban gibu gab gābum gigeban ("to give")
• bitten bat bātum gibetan ("to ask")

In Modern German this group is little changed from Old High German:

• geben (gib) gab gegeben
• bitten bat gebeten

The verb essen ("to eat") had a past participle giezzan in OHG; in MHG this became geezzen which was contracted to gezzen and then re-prefixed to gegezzen:

• essen (iss) aß gegessen

Class 5 verbs in modern German: essen, geben, genesen, geschehen, lesen, messen, sehen, treten, vergessen; with j-presents, bitten, liegen, sitzen.

In Dutch, class 5 is much as in German, except that the preterite retains the vowel length distinction which we also observed in class 4 above.

• geven gaf (gaven) gegeven
• bidden bad (baden) gebeden
• eten at (aten) gegeten

zien ("to see") has experienced a loss of the original /h/, with a resulting assimilation of the stem vowel to the vowel of the inflection, and shows Grammatischer Wechsel between this original /h/ and a /g/ in the preterite:

• zien, zag (zagen), gezien

Class 5 verbs in Dutch: eten, geven, genezen, lezen, meten, treden, vergeten; anomalous: zien; with j-presents: bidden, liggen, zitten.

In Gothic:

• giban gaf gēbun gibans
• saiƕan saƕ sēƕun saiƕans

Class 6

Class 6, Sweet's "shake conjugation", represents all verbs in which the Proto-Germanic vowel was *a. PIE sources of this vowel included *h₂e, *o, and a laryngeal between consonants. Possibly in some cases the a may be an example of the a-grade of ablaut, though this is controversial. Like class 5, this class too has j-presents. Compare with Latin facio ("I do"): infinitive facere, indicative active perfect singular fēci, perfect passive participle factus.

	Part 1	Part 2	Part 3	Part 4	Part 5
Proto Indo-European	h₂él-	h₂éliti	h₂eh₂óle	h₂eh₂lń̥d	h₂eló-
Proto Germanic	alaną	alidi	ōl	ōlun	alanaz
Old English	alan	ælþ	ōl	ōlon	alen
Old Saxon	dragan	dregid	drōg	drōgun	gidragan
Old High German	tragan	tregit	truog	truogun	gitragan
Old Norse	ala	ell	ól	ólu	alinn
Gothic	alan	aliþ	ōl	ōlun	alans

In Old English

• scacan scæcþ scōc scōcon scacen ("to shake")
• faran færþ fōr fōron faren ("to travel, fare")
• sacan sæcþ sōc sōcon sacen ("to quarrel")

Contracted

• slēan sliehþ slōg slōgon slægen ("to strike, slay")

With j-presents (and other anomalies)

• hebban hōf hōfon hafen ("to raise, heave")
• scieppan scōp scōpon scapen ("to create, shape")
• swerian swōr swōron sworen ("to swear")

The verb "to stand" has an anomalous loss of its -n- in the preterite:

• standan stent stōd stōdon standen

In Modern English, shake, take and forsake come closest to the original vowel sequence. The consonant anomaly in stand is still visible, and is extended to the participle.

• shake shook shaken
• stand stood stood

Class 6 verbs in modern English: draw, forsake, lade, shake, shape, shave, slay, stand, take. The verb heave is in this class when used in a nautical context. Like most other classes in Modern English, this class has lost cohesion and now forms principal parts according to many different patterns. Two preterites (drew and slew) are now spelled with "ew", which is similar in sound to the "oo" of the others that still use a strong form. Swear is now class 4. The adjective graven was originally a past participle of the now obsolete verb grave. Note that lade, shape, shave are now weak outside of their optionally strong past participle forms (laden, shapen, and shaven, respectively).

In Old High German the preterite is marked by the diphthong uo:

• graban grebit gruob gruobum gigraban ("to dig, grave")

With j-present:

• heffen huob huobum gihaban ("to heave")

In Modern German the uo is monophthongised to a u.

• graben gräbt grub gegraben

However, the j-presents have instead taken an o in the preterite and participle, perhaps by analogy with class 2.

• heben hob gehoben

Class 6 verbs in modern German: fahren, graben, laden, schaffen, schlagen, tragen, waschen; also backen, fragen, though these are usually weak nowadays; with j-present: heben, schwören. The past tense and participle of stehen (stand, older stund, gestanden), which derive from a lost verb *standen, also belong to this class.

In Dutch, the regular class 6 verbs are close to German:

• graven groef gegraven

However the three j-presents have taken the vowel ie in the preterite, and have chosen three separate paths in the participle:

• scheppen schiep geschapen
• heffen hief geheven
• zweren zwoer gezworen ("to swear an oath")

Class 6 verbs in Dutch are: dragen, graven, slaan, varen, and with j-present: heffen, scheppen, zweren; also "semi-strong" (i.e. with a strong preterite but a weak participle) jagen, klagen (in archaic or regional usage, modern usage is mostly weak), vragen.

In Gothic:

• faran fōr fōrun farans

Class 7

Class 7, Sweet's "fall conjugation", is not based on an Indo-European ablaut sequence as such; rather, it is the class showing reduplication in Gothic and irregular ablaut patterning in the other branches. It is generally believed that reduplication was once a feature of all Proto-Indo-European perfects, but it was lost in most verbs by Proto-Germanic times due to haplology. However, those verbs whose present and past stem did not differ in ablaut would not have had a marked distinction between present and past, so reduplication was originally retained in those verbs, which are the verbs categorized as class 7. Class 7 did not form a single unified class, but can be split into several subclasses based on the structure of the root. The first three were parallel with the first three classes: 7a was parallel to class 1, class 7b to class 2, and class 7c to class 3.

The following is a general picture of the Proto-Germanic situation as reconstructed by J. Jasanoff. Earlier reconstructions of the 7th class were generally based mostly on Gothic evidence.

Subclass	Part 1	Part 2	Part 3	Part 4	Part 5
7a (-ai-)	haitaną	haitidi	hegait	hegitun	haitanaz
7b (-au-)	hlaupaną stautaną	hlaupidi stautidi	heglaup stestaut	heglupun stestutun	hlaupanaz stautanaz
7c (-aR-)	haldaną fanhaną	haldidi fanhidi	hegald febanh	heguldun febungun	haldanaz fanganaz
7d (-ē-)	lētaną sēaną	lētidi sēidi	lelōt sezō	lel-tun sez-un	lētanaz sēanaz
7e (-ō-)	blōtaną grōaną	blōtidi grōidi	beblōt gegrō	beblut gegr-un	blōtanaz grōanaz

The situation sketched above did not last. The later development of class 7 differs markedly between Gothic on one hand, and the Northwest Germanic languages on the other.

Gothic

Reduplication was retained in Gothic. However, as in all other strong verbs, Verner alternations were (almost) entirely eliminated in favour of the voiceless alternants. The present and past singular stem was extended to the plural, leaving the reduplication as the only change in the stem between the two tenses. Some examples from Gothic will illustrate this here.

Subclass	Part 1	Part 2	Part 3	Part 4	Part 5
7a (-ai-)	haitan	haitiþ	haihait	haihaitun	haitans
7b (-au-)	hlaupan	hlaupiþ	haihlaup	haihlaupun	hlaupans
7c (-aR-)	haldan fāhan	haldiþ fāhiþ	haihald faifāh	haihaldun faifāhun	haldans fāhans
7d (-ē-)	lētan saian	lētiþ saiiþ	lailōt saisō	lailōtun saisōun	lētans saians
7e (-ō-)	ƕōpjan	ƕōpjiþ	ƕaiƕōp	ƕaiƕōp	ƕōpans

Ablaut was retained in a few class 7d verbs, but eliminated otherwise by generalising the present tense stem throughout the paradigm. Compare lētan above, which retained it, with slēpan which had the past tense form saislēp. The form saizlēp with Verner alternation is occasionally found as well, but it was apparently a relic formation with no other examples of alternation elsewhere.

Northwest Germanic

In the Northwest Germanic languages, which include all modern surviving Germanic languages, class 7 was drastically remodelled. Reduplication was almost eliminated, except for a few relics, and new ablaut patterns were introduced. Many attempts were made to explain this development. J. Jasanoff posits the following series of events within the history of Northwest Germanic:

1. Root-initial consonant clusters were transferred to the beginning of the reduplicating syllable, to preserve the same word onset across the paradigm. The clusters were simplified and reduced medially. (Compare Latin scindō ~ scicidī and spondeō ~ spopondī, which show the same development)

   *hlaupaną: *hehlaup, *hehlupun > *hlelaup, *hlelupun

   *stautaną: *stestaut, *stestutun > *stezaut, *stezutun

   *blōtaną: *beblōt, *beblutun > *blelōt, *blelutun

   *grōaną: *gegrō, *gegrōun > *grerō, *grerōun

   *swōganą: *sezwōg, *sezwōgun > *swewōg, *sweugun

2. Root compression:
   1. Based on the pattern of verbs such as singular *lelōt, *rerōd ~ plural *leltun, *rerdun, as well as verbs like singular *swewōg ~ plural *sweugun, the root vowel or diphthong was deleted in the past plural stem. The Germanic spirant law caused devoicing in certain consonants where applicable.

      *haitaną: *hegait, *hegitun > *hegait, *hehtun

      *bautaną: *bebaut, *bebutun > *bebaut, *beftun

      *hlaupaną: *hlelaup, *hlelupun > *hlelaup, *hlelpun

      *stautaną: *stezaut, *stezutun > *stezaut, *stestun

      *blōtaną: *blelōt, *blelutun > *blelōt, *bleltun

   2. In class 7c verbs, this resulted in consonant clusters that were not permissible (e.g. **hegldun); these clusters were simplified by dropping the root-initial consonant(s).

      *haldaną: *hegald, *heguldun > *hegald, *heldun

      *fanhaną: *febanh, *febungun > *febanh, *fengun

3. The present plural stem of class 7c verbs no longer appeared to be reduplicated because of the above change, and was extended to the singular. This created what appeared to be a new form of ablaut, with a in the present and e in the past plural.

   *haldaną: *hegald, *heldun > *held, *heldun

   *fanhaną: *febanh, *fengun > *feng, *fengun

4. This new form of ablaut was then extended to other classes, by alternating *a with *e in classes 7a and 7b, and *ā with *ē in class 7d. In class 7a, this resulted in the vowel *ei, which soon merged with *ē (from Germanic *ē²).

   *haitaną: *hegait, *hehtun > *heit, *heitun > *hēt, *hētun

   *hlaupaną: *hlelaup, *hlelpun > *hleup, *hleupun

   *lātaną: *lelōt, *leltun > *lēt, *lētun

5. It is at this point that North and West Germanic begin to diverge.
   • In West Germanic, class 7e took *eu as the past stem vowel, by analogy with existing verbs with initial *(s)w- such as *wōpijaną, *weup(un) and *swōganą, *swewg(un).

     *blōtaną: *blelōt(un) > *bleut(un)

     *hrōpaną: *hrerōp(un) > *hreup(un)

     *grōaną: *grerō(un) > *greu, *gre(u)wun

   • In North Germanic, class 7e instead took *ē as the past stem vowel, probably by analogy with class 7c which also had a long stem vowel.

     *blōtaną: *blelōt(un) > *blēt(un)

Stages 4 and 5 were not quite complete by the time of the earliest written records. While most class 7 verbs had replaced reduplication with ablaut entirely, several vestigial remains of reduplication are found throughout the North and West Germanic languages.

Various other changes occurred later in the individual languages. *e in class 7c was replaced by *ē (> ia) in Old High German and Old Dutch, but by *eu (> ēo) in Old English. The resulting ablaut patterns in the various daughter languages were as follows.

Class 7a:

	Part 1	Part 2	Part 3	Part 4	Part 5
Post-Northwest Germanic	haitaną	haitidi	hēt	hētun	haitanaz
Old English	hātan	hǣtt	hēt	hēton	hāten
Old Saxon	hētan	hētid	hēt	hētun	gihētan
Old High German	heizan	heizit	hiaz	hiazun	giheizan
Old Norse	heita	heitir	hét	hétu	heitinn

Class 7b:

	Part 1	Part 2	Part 3	Part 4	Part 5
Post-Northwest Germanic	hlaupaną	hlaupidi	hleup	hleupun	hlaupanaz
Old English	hlēapan	hlīepþ	hlēop	hlēppon	hlēapen
Old Saxon	hlōpan	hlōpid	hliop	hliopun	gihlōpan
Old High German	(h)loufan	(h)loufit	(h)liof	(h)liofun	gi(h)loufan
Old Norse	hlaupa	hleypr	hljóp	hljópu	hlaupinn

Class 7c:

	Part 1	Part 2	Part 3	Part 4	Part 5
Post-Northwest Germanic	haldaną	haldidi	held	heldun	haldanaz
Old English	healdan	hielt	hēold	hēoldon	healden
Old Saxon	haldan	heldid	held	heldun	gihaldan
Old High German	haltan	heltit	hialt	hialtun	gihaltan
Old Norse	halda	heldr	helt	heldu	haldinn

Class 7d:

	Part 1	Part 2	Part 3	Part 4	Part 5
Post-Northwest Germanic	rādaną	rādidi	rēd	rēdun	rādanaz
Old English	rǣdan	rǣtt	rēd	rēdon	rǣden
Old Saxon	rādan	rādid	rēd	rēdun	girādan
Old High German	rātan	rātit	riat	riatun	girātan
Old Norse	ráða	ræðr	réð	réðu	ráðinn

Class 7e (no single verb is attested in all daughters):

	Part 1	Part 2	Part 3	Part 4	Part 5
Post-Northwest Germanic	blōtaną	blōtidi	bleut (WG), blēt (NG)	bleutun (WG), blētun (NG)	blōtanaz
Old English	blōtan	blētt	blēot	blēoton	blōten
Old Saxon	wōpian	wōpid	wiop	wiopun	giwōpan
Old High German	wuofan	wuofit	wiof	wiofun	giwuofan
Old Norse	blóta	blœtr	blét	blétu	blótinn

In Old English the subclasses are still distinct: Examples of class 7a, 7d:

• hātan hǣtt hēt hēton hāten ("to call")
• slǣpan slǣpþ slēp slēpon slǣpen ("to sleep")

Examples of class 7b, 7c, 7e:

• feallan fielþ fēoll fēollon feallen ("to fall")
• healdan hielt hēold hēoldon healden ("to hold")
• cnāwan cnǣwþ cnēow cnēowon cnāwen ("to know")
• grōwan grēwþ grēow grēowon grōwen ("to grow")
• hlēapan hlīepþ hlēop hlēopon hlēapen ("to run, leap")

Two verbs of class 7c, which originally had -āh- from earlier -anh-, have moved into class 7a/d. They retain grammatischer Wechsel:

• fōn fēhþ fēng fēngon fangen ("to seize", cf. "fang")
• hōn hēhþ hēng hēngon hangen ("to hang")

Some relics of reduplication remain, mostly in texts from Anglia:

• bēatan beoft ("to beat")
• hātan hēht ("to call")
• lācan leolc ("to move about, leap")
• lǣtan leort ("to let")
• on-drǣdan on-dreord ("to dread")
• rēdan reord ("to advise")
• spātan speoft ("to spit")

In Modern English this class has lost its homogeneity:

• fall fell fallen
• hang hung hung (Note that, in the transitive sense of hanging someone by the neck, hang usually has regular weak conjugation)
• hold held held (the original past participle is preserved in the adjective beholden)
• throw threw thrown

The following modern English verbs descend from class 7 verbs, and still retain strong-verb endings: beat, blow, fall, hew, grow, hang, hold, know, throw. (Hew can be a preterite or present, although the usual preterite is hewed.) The verb sow retains the stong-verb participle sown but the preterite is now sowed. (The verb sew was always weak, even though one can say sewn for the past participle.) Archaic English still retains the reduplicated form hight ("was called").

In Old High German a few relics of reduplication remain:

• ana-stōzan ana-sterōz ("to strike")
• pluozan pleruzzun ("to sacrifice"), in Upper German with the change b > p
• ki-scrōtan ki-screrōt ("to cut"), in Upper German with the change g > k
• būan biruun ("to dwell"); this was not a class 7 strong verb originally

In Modern German the various past tense vowels have merged into a single uniform -ie-:

Class 7a:

• heißen (heißt) hieß geheißen ("to be called")

Class 7b:

• laufen (läuft) lief gelaufen ("to run")

Class 7c:

• halten (hält) hielt gehalten ("to hold, halt")

Class 7d:

• schlafen (schläft) schlief geschlafen ("to sleep")

Class 7e:

• stoßen (stößt) stieß gestoßen ("to push, to knock")

The two anomalous verbs in Old English have back-formed new present stems from the past stem in Modern German, and have eliminated grammatischer Wechsel and shortened the vowel in the past tense:

• fangen (fängt) fing gefangen ("to catch")
• hängen (hängt) hing gehangen ("to hang")

Other class 7 verbs in modern German are: blasen, braten, fallen, halten, heißen, lassen, laufen, raten, rufen, schlafen, stoßen; anomalous: fangen, hängen. The past tense and participle of German gehen, ging gegangen, derive from a lost verb *gangen which belongs to this class.

In both Middle and Modern Dutch this class is very similar to German. However, several verbs have become semi-strong, and retain only the strong past participle while having an innovated weak past tense.

Class 7a has disappeared. The verb heten ("to call") has become weak, but retains its strong past participle geheten. One relic still remains, but it the strong past is no longer used:

• uitscheiden - scheed uit - uitgescheiden ("to secrete")

Class 7b:

• lopen liep gelopen ("to walk, to run")

Class 7c has disintegrated due to several sound changes. A "regular" example is:

• vallen viel gevallen ("to fall")

As in German, two anomalous class 7c verbs have formed new present stems, and shortened the vowel in the past tense:

• vangen ving gevangen ("to catch")
• hangen hing gehangen ("to hang")

One verbs displays L-vocalization:

• houden hield gehouden ("to hold")

Class 7d:

• blazen blies geblazen ("to blow")
• slapen sliep geslapen ("to sleep")

Class 7e:

• roepen riep geroepen ("to call")

Other class 7 verbs in Dutch are: blazen, laten, raden*, slapen, stoten*, vallen; anomalous: hangen, vangen, gaan, houden, vouwen*. (The verbs with * are nowadays mostly semi-strong)

Old Norse also retains some reduplicated verbs. Most still remain as the Icelandic Ri-verbs:

• bnúa bneri ("to rub")
• gnúa gneri ("to rub")
• gróa greri ("to grow")
• róa reri ("to row")
• sá seri ("to sow")
• snúa sneri ("to turn")

References

• Alfred Bammesberger, Der Aufbau des germanischen Verbalsystems, Heidelberg 1986.
• Cornelius van Bree, Historische grammatica van het Nederlands, Dordrecht 1987.
• W. G. Brill, Nederlandsche spraakleer; ten gebruike bij inrichtingen van hooger onderwijs, Leiden 1871
• Frans van Coetsem, Ablaut and Reduplication in the Germanic Verb (=Indogermanische Bibliothek. vol 3), Heidelberg: Winter Verlag, 1993, ISBN 3-8253-4267-0.
• Jerzy Kuryłowicz and Manfred Mayrhofer, Indogermanische Grammatik, Heidelberg 1968/9.
• Marcin Krygier, The Disintegration of the English Strong Verb System, Frankfurt c.1994.
• Richard Hogg, A Grammar of Old English, Oxford 1992.
• Wilhelm Braune, revised by Walther Mitzka, Althochdeutsche Grammatik, Tübingen 1961.
• Donald Ringe, From Proto-Indo-European to Proto-Germanic, Oxford 2006.