- was the dropping of final -a or -e in unstressed syllables; for example, post-PIE ''*wóyd-e'' > Gothic ''wait'', "knows". Antonsen agreed with Lehmann about the upper boundary<ref>{{cite journal
- * {{PIE|/ḱ/}} > {{PIE|/k/}} — {{PIE|*ḱm̥tóm}} "hundred" > {{PIE|*km̥tóm}} > {{PIE|*hundą}}
- * {{PIE|/ǵ/}} > {{PIE|/g/}} — {{PIE|*wérǵom}} "work" > {{PIE|*wérgom}} > {{PIE|*werką}}
- * {{PIE|/ǵʰ/}} > {{PIE|/gʰ/}} — {{PIE|*ǵʰóstis}} "stranger" > {{PIE|*gʰóstis}} > {{PIE|*gastiz}} "guest"
- further back (post-velar); hence it may be more accurate to say that, for example, {{PIE|/k/}} > {{PIE|/ḱ/}} (see e.g. Ringe 2006, p. 87). Some also claim that the two series may not even have
- * {{PIE|/m̥/}} > {{PIE|/um/}} — {{PIE|*ḱm̥tóm}} "hundred" > {{PIE|*kumtóm}} > {{PIE|*hundą}}
- * {{PIE|/n̥/}} > {{PIE|/un/}} — {{PIE|*n̥tér}} "inside" > {{PIE|*untér}} > {{PIE|*under}} "among"
- * {{PIE|/l̥/}} > {{PIE|/ul/}} — {{PIE|*wĺ̥kʷos}} "wolf" > {{PIE|*wúlkʷos}} > {{PIE|*wulfaz}}
- * {{PIE|/r̥/}} > {{PIE|/ur/}} — {{PIE|*wŕ̥mis}} "worm" > {{PIE|*wurmis}} > {{PIE|*wurmiz}}
- *This sequence now becomes: {{PIE|/TsT/}} > {{PIE|/ts/}} > {{PIE|/ss/}} — {{nowrap|{{PIE|*wid-tós}} "known" (pronounced {{PIE|*widstos}}) > {{PIE|*witstós}} > {{PIE|*wissós}} > {{PIE|*wissaz}} "certain"}}
- in which case it remained (even after [[Grimm's law]] below)— {{nowrap|{{PIE|*atta}} "dad" > {{PIE|*attô}}}}
- or a long vowel — {{nowrap|{{PIE|*káyd-tis}} "act of calling" (pronounced {{PIE|*káydstis}}) > {{PIE|*káyssis}} > {{PIE|*káysis}} > {{PIE|*haisiz}} "command"}}
- |'''Word-final long vowels are lengthened''' to "overlong" vowels — {{PIE|*séh₁mō}} "seeds" > {{PIE|*séh₁mô}} > {{PIE|*sēmô}}
- * Word-initial laryngeals are lost before a consonant — {{nowrap|{{PIE|*h₁dóntm̥}} "tooth, acc." > {{PIE|*dóntum}} > {{PIE|*tanþų}}}}
- ** {{PIE|/h₁V/}} > {{PIE|/V/}} — {{PIE|*h₁ésti}} "is" > {{PIE|*ésti}} > {{PIE|*isti}}
- ** {{PIE|/h₂e/}} > {{PIE|/a/}}, {{PIE|/h₂V/}} > {{PIE|/V/}} otherwise — {{nowrap|{{PIE|*h₂énti}} "in front" > (with shift of accent) {{PIE|*antí}} > {{PIE|*andi}} "in addition"}}
- ** {{PIE|/h₃e/}} > {{PIE|/o/}}, {{PIE|/h₃V/}} > {{PIE|/V/}} otherwise — {{PIE|*h₃érō}} "eagle" > {{PIE|*órô}} > {{PIE|*arô}}
- * Laryngeals are lost after vowels, but lengthen the preceding vowel: {{PIE|/VH/}} > {{PIE|/Vː/}} — {{nowrap|{{PIE|*séh₁mō}} "seeds" > {{PIE|*sēmô}} > {{PIE|*sēmô}}}}
- because of this change contract into an overlong vowel — {{nowrap|{{PIE|*-oHom}} "genitive plural" > {{PIE|*-ôm}} > {{PIE|*-ǫ̂}}; {{PIE|*-eh₂es}} "eh₂-stem nom. pl." > {{PIE|*-âs}} > {{PIE|*-ôz}}}}
- vowels that were formed from PIE word-final long vowels — {{PIE|*-oh₂}} "thematic 1st sg." > {{PIE|*-ō}}
- strengthened to {{PIE|/g/}} between a sonorant and {{PIE|/w/}} — {{nowrap|{{PIE|*n̥h₃mé}} "us two" > {{PIE|*n̥h₃wé}} > {{PIE|*ungwé}} > {{PIE|*unk}}}}
- |'''Vocalisation of remaining laryngeals''': {{PIE|/H/}} > {{PIE|/ə/}} — {{nowrap|{{PIE|*ph₂tḗr}} "father" > {{PIE|*pətḗr}} > {{PIE|*fadēr}}; {{PIE|*sámh₂dʰos}} "sand" > {{PIE|*sámədʰos}} > {{PIE|*samdaz}}}}
- |'''Velars are labialised''' by following {{PIE|/w/}}: {{PIE|*éḱwos}} "horse" > {{PIE|*ékwos}} > {{PIE|*ékʷos}} > {{PIE|*ehwaz}}
- or {{PIE|/un/}}) and before {{PIE|/t/}} — {{nowrap|{{PIE|*gʷʰénti-}} ~ {{PIE|*gʷʰn̥tí-}} "killing" > {{PIE|*gʷʰúntis}} > {{PIE|*gʰúntis}} > {{PIE|*gunþiz}} "battle"}}
- non-high short vowels''' {{PIE|/e/}}, {{PIE|/a/}}, {{PIE|/o/}} — {{PIE|*wóyde}} "(s)he knows" > {{PIE|*wóyd}} > {{PIE|*wait}}
- *A {{PIE|/j/}} or {{PIE|/w/}} preceding the vowel is also lost — {{PIE|*tósyo}} "of that" > {{PIE|*tós}} > {{PIE|*þas}}
- *Single-syllable words were not affected, but clitics were — {{PIE|*-kʷe}} "and" > {{PIE|*-kʷ}} > {{PIE|*-hw}}
- vowel was accented, the accent shifted to the preceding syllable — {{nowrap|{{PIE|*n̥smé}} "us" > {{PIE|*n̥swé}} > {{PIE|*unswé}} > {{PIE|*úns}} > {{PIE|*uns}}}} (not {{PIE|*unz}}, showing that loss occurred before Verner's law)
- **{{PIE|/p/}} > {{PIE|/ɸ/}} ({{PIE|f}}) — {{nowrap|{{PIE|*ph₂tḗr}} "father" > {{PIE|*fəþḗr}} > {{PIE|*fadēr}}}}
- **{{PIE|/t/}} > {{PIE|/θ/}} ({{PIE|þ}}) — {{nowrap|{{PIE|*tód}} "that" > {{PIE|*þód}} > {{PIE|*þat}}}}
- **{{PIE|/k/}} > {{PIE|/x/}} ({{PIE|h}}) — {{nowrap|{{PIE|*kátus}} "fight" > {{PIE|*háþus}} > {{PIE|*haþuz}}; {{PIE|*h₂eǵs-}} "axle" > (devoicing) {{PIE|*aks-}} > {{PIE|*ahs-}} > {{PIE|*ahsō}}}}
- **{{PIE|/kʷ/}} > {{PIE|/xʷ/}} ({{PIE|hw}}) — {{nowrap|{{PIE|*kʷód}} "what" > {{PIE|*hʷód}} > {{PIE|*hwat}}}}
- ***{{PIE|/bt/}}, {{PIE|/bʰt/}}, {{PIE|/pt/}} > {{PIE|/ɸt/}} — {{nowrap|{{PIE|*kh₂ptós}} "grabbed" > {{PIE|*kəptós}} > {{PIE|*həftós}} > {{PIE|*haftaz}} "captive"}}
- ***{{PIE|/gt/}}, {{PIE|/gʰt/}}, {{PIE|/kt/}} > {{PIE|/xt/}} — {{nowrap|{{PIE|*oḱtṓw}} "eight" > {{PIE|*oktṓw}} > {{PIE|*ohtṓw}} > {{PIE|*ahtōu}}}}
- ***{{PIE|/gʷt/}}, {{PIE|/gʷʰt/}}, {{PIE|/kʷt/}} > {{PIE|/xt/}} — {{nowrap|{{PIE|*nokʷtm̥}} "night, acc." > {{PIE|*noktum}} > {{PIE|*nohtum}} > {{PIE|*nahtų}}}}
- **{{PIE|/b/}} > {{PIE|/p/}} — {{nowrap|{{PIE|*dʰewbu-}} "deep" > {{PIE|*dʰewpu-}} > {{PIE|*dewpu-}} > {{PIE|*deupaz}}}} (reformed as a-stem)
- **{{PIE|/d/}} > {{PIE|/t/}} — {{nowrap|{{PIE|*h₁dóntm̥}} "tooth, acc." > {{PIE|*tónþum}} > {{PIE|*tanþų}}; {{PIE|*kʷód}} "what" > {{PIE|*hʷód}} > {{PIE|*hwat}}}}
- **{{PIE|/g/}} > {{PIE|/k/}} — {{nowrap|{{PIE|*wérǵom}} "work" > {{PIE|*wérgom}} > {{PIE|*wérkom}} > {{PIE|*werką}}}}
- **{{PIE|/gʷ/}} > {{PIE|/kʷ/}} — {{nowrap|{{PIE|*gʷémeti}} "(s)he will step, subj." > {{PIE|*kʷémeþi}} > {{PIE|*kwimidi}} "(s)he comes"}}
- **{{PIE|/bʰ/}} > {{PIE|/b/}} ({{PIE|[b,β]}}) — {{nowrap|{{PIE|*bʰéreti}} "(s)he is carrying" > {{PIE|*béreþi}} > {{PIE|*biridi}}}}
- **{{PIE|/dʰ/}} > {{PIE|/d/}} ({{PIE|[d,ð]}}) — {{nowrap|{{PIE|*dʰóh₁mos}} "thing put" > {{PIE|*dṓmos}} > {{PIE|*dōmaz}} "judgement"}}
- **{{PIE|/gʰ/}} > {{PIE|/g/}} ({{PIE|[g,ɣ]}}) — {{nowrap|{{PIE|*gʰáns}} "goose" > {{PIE|*gáns}} > {{PIE|*gans}}}}
- **{{PIE|/gʷʰ/}} > {{PIE|/gʷ/}} ({{PIE|[gʷ,ɣʷ]}}) — {{nowrap|{{PIE|*sóngʷʰos}} "chant" > {{PIE|*sóngʷos}} > {{PIE|*sangwaz}} "song"}}
- *{{PIE|/ɸ/}} > {{PIE|[β]}} — {{nowrap|{{PIE|*upéri}} "over" > {{PIE|*uféri}} > {{PIE|*ubéri}} > {{PIE|*ubiri}}}}
- *{{PIE|/θ/}} > {{PIE|[ð]}} — {{nowrap|{{PIE|*tewtéh₂}} "tribe" > {{PIE|*þewþā́}} > {{PIE|*þewdā́}} > {{PIE|*þeudō}}}}
- *{{PIE|/x/}} > {{PIE|[ɣ]}} — {{nowrap|{{PIE|*h₂yuHn̥ḱós}} "young" > {{PIE|*yunkós}} > {{PIE|*yunhós}} > {{PIE|*yungós}} > {{PIE|*jungaz}}}} (with -z by analogy)
- *{{PIE|/xʷ/}} > {{PIE|[ɣʷ]}} — {{nowrap|{{PIE|*kʷekʷléh₂}} "wheels (collective)" > {{PIE|*hʷehʷlā́}} > {{PIE|*hʷegʷlā́}} > {{PIE|*hweulō}}}}
- *{{PIE|/s/}} > {{PIE|[z]}} — {{PIE|*h₁régʷeses}} "of darkness" > {{PIE|*rékʷeses}} > {{PIE|*rékʷezez}} > {{PIE|*rikwiziz}}; {{PIE|*kʷékʷlos}} "wheel" > {{PIE|*hʷéhʷlos}} > {{PIE|*hʷéhʷloz}} > {{PIE|*hwehwlaz}}
- were generally unaccented were also affected — {{PIE|*h₁ésmi}}, unstressed {{PIE|*h₁esmi}} "I am" > {{PIE|*esmi}} > {{PIE|*ezmi}} > {{PIE|*immi}}; {{PIE|*h₁sénti}}, unstressed {{PIE|*h₁senti}} "they are" > {{PIE|*senþi}} > {{PIE|*sendi}} > {{PIE|*sindi}} (the stressed variants, which would have become {{PIE|*ismi}} and {{PIE|*sinþi}},
- |'''Word-initial {{PIE|/gʷ/}} > {{PIE|/b/}}''' — {{nowrap|{{PIE|*gʷʰédʰyeti}} "(s)he is asking for" > {{PIE|*gʷédyedi}} > {{PIE|*bédyedi}} > {{PIE|*bidiþi}} "(s)he asks, (s)he prays"}} (with -þ- by analogy)
- *{{PIE|/nw/}} > {{PIE|/nn/}} — {{PIE|*ténh₂us}} "thin" ~ fem. {{PIE|*tn̥h₂éwih₂}} > {{PIE|*tn̥h₂ús}} ~ {{PIE|*tn̥h₂wíh₂}} > {{PIE|*þunus}} ~ {{PIE|*þunwī}} > {{PIE|*þunus}} ~ {{PIE|*þunnī}} > {{PIE|*þunnuz}} ~ {{PIE|*þunnī}}
- *{{PIE|/ln/}} > {{PIE|/ll/}} — {{nowrap|{{PIE|*pl̥h₁nós}} "full" > {{PIE|*fulnos}} > {{PIE|*fullos}} > {{PIE|*fullaz}}}}. This development postdated contact with the [[Samic languages]], as is shown by
- development postdated contact with the [[Samic languages]], as is shown by the loanword *pulna > [[Proto-Samic]] *polnē "hill(ock), mound".<ref name="Aikio06">{{cite journal|first=Ante|last=Aikio|
- *{{PIE|/zm/}} > {{PIE|/mm/}} — {{nowrap|{{PIE|*h₁esmi}} "I am, unstr." > {{PIE|*ezmi}} > {{PIE|*emmi}} > {{PIE|*immi}}}}
- |'''Unstressed {{PIE|/owo/}} > {{PIE|/oː/}}''' — {{nowrap|{{PIE|*-owos}} "thematic 1st du." > {{PIE|*-ōz}}}}
- |'''Unstressed {{PIE|/ew/}} > {{PIE|/ow/}}''' before a consonant or word-finally — {{nowrap|{{PIE|*-ews}} "u-stem gen. sg." > {{PIE|*-owz}} > {{PIE|*-auz}}}}
- |{{anchor|Unstressed /e/ > /i/}}'''Unstressed {{PIE|/e/}} > {{PIE|/i/}}''' except before {{PIE|/r/}} — {{PIE|*-éteh₂}} "abstract noun suffix" > {{PIE|*-eþā}} > {{PIE|*-iþā}} > {{PIE|*-iþō}}
- *Unstressed {{PIE|/ej/}} contracts to {{PIE|/iː/}} — {{PIE|*-éys}} "i-stem gen. sg." > {{PIE|*-iys}} > {{PIE|*-īs}} > {{PIE|*-īz}} (with -z by analogy)
- as a whole were also affected, often creating stressed/unstressed pairs — {{PIE|*éǵh₂}} "I" > {{PIE|*ek}} > unstressed {{PIE|*ik}} (remaining beside stressed {{PIE|*ek}})
- |{{anchor|Unstressed /ji/ > /i/}}'''Unstressed {{PIE|/ji/}} > {{PIE|/i/}}''' — {{PIE|*légʰyeti}} "(s)he is lying down" ~ {{PIE|*légʰyonti}} "they are lying down"
- {PIE|/i/}}''' — {{PIE|*légʰyeti}} "(s)he is lying down" ~ {{PIE|*légʰyonti}} "they are lying down" > {{PIE|*legyidi}} ~ {{PIE|*legyondi}} > {{PIE|*legidi}} ~ {{PIE|*legyondi}} > {{PIE|*ligiþi}} ~ {{PIE|*ligjanþi}} (with -þ- by analogy)
- creates diphthongs from originally disyllabic sequences — {{PIE|*-oyend}} "thematic optative 3pl" > {{PIE|*-oyint}} > {{PIE|*-oint}} > {{PIE|*-ain}}; {{PIE|*áyeri}} "in the morning" > {{PIE|*ayiri}} > {{PIE|*airi}} "early"; {{PIE|*tréyes}} "three" > {{PIE|*þreyiz}} > {{PIE|*þreiz}} > {{PIE|*þrīz}}
- *The sequence {{PIE|/iji/}} becomes {{PIE|/iː/}} — {{PIE|*gʰósteyes}} "strangers, nom. pl." > {{PIE|*gostiyiz}} > {{PIE|*gostīz}} > {{PIE|*gastīz}} "guests"
- *{{PIE|/o/}}, {{PIE|/a/}} — {{PIE|/ɑ/}} - {{PIE|*gʰóstis}} "stranger" > {{PIE|*gostiz}} > {{PIE|*gastiz}} "guest"; {{PIE|*kátus}} "fight" > {{PIE|*haþuz}} "battle"
- *{{PIE|/oː/}}, {{PIE|/aː/}} > {{PIE|/ɑː/}} — {{PIE|*dʰóh₁mos}} "thing put" > {{PIE|*dōmoz}} > {{PIE|*dāmaz}} > {{PIE|*dōmaz}} "judgement"; {{PIE|*swā́dus}} "sweet" > {{PIE|*swātuz}} > {{PIE|*swōtuz}}
- *{{PIE|/oːː/}}, {{PIE|/aːː/}} > {{PIE|/ɑːː/}} (â) — {{PIE|*séh₁mō}} "seeds" > {{PIE|*sēmô}} > {{PIE|*sēmâ}} > {{PIE|*sēmô}}; {{PIE|*-eh₂es}} "eh₂-stem nom. pl." > {{PIE|*-âz}} > {{PIE|*-ôz}}
- |{{anchor|Word-final /m/ > /n/}}'''Word-final {{PIE|/m/}} > {{PIE|/n/}}''' — {{PIE|*tóm}} "that, acc. masc." > {{PIE|*þam}} > {{PIE|*þan}} "then"; {{PIE|*-om}} "a-stem acc. sg." > {{PIE|*-am}} > {{PIE|*-an}} > {{PIE|*-ą}}
- |'''{{PIE|/m/}} > {{PIE|/n/}} before dental consonants''' — {{PIE|*ḱm̥tóm}} "hundred" > {{PIE|*humdan}} > {{PIE|*hundan}} > {{PIE|*hundą}}; {{PIE|*déḱm̥d}} "ten" > {{PIE|*tehumt}} > {{PIE|*tehunt}} > {{PIE|*tehun}}
- after unstressed syllables, and the preceding vowel is nasalised — {{PIE|*-om}} "a-stem acc. sg." > {{PIE|*-am}} > {{PIE|*-an}} > {{PIE|*-ą}}; {{PIE|*-eh₂m}} > {{PIE|*-ān}} > {{PIE|*-ą̄}} > {{PIE|*-ǭ}}; {{PIE|*-oHom}} "genitive plural" > {{PIE|*-ân}} > {{PIE|*-ą̂}} > {{PIE|*-ǫ̂}}
- |'''Nasal {{PIE|/ẽː/}} is lowered''' to {{PIE|/ɑ̃ː/}} — {{PIE|*dʰédʰeh₁m}} "I was putting" > {{PIE|*dedēn}} > {{PIE|*dedę̄}} > {{PIE|*dedą̄}} > {{PIE|*dedǭ}}
- * Unstressed {{PIE|/ə/}} is lost between consonants — {{PIE|*sámh₂dʰos}} "sand" > {{PIE|*samədaz}} > {{PIE|*samdaz}}; {{PIE|*takéh₁-}} "to be silent" > (with added suffix) {{PIE|*takəyónti}} "they are silent" > {{PIE|*þagəyanþi}} > {{PIE|*þagyanþi}} > {{PIE|*þagjanþi}}
- * {{PIE|/ə/}} > {{PIE|/ɑ/}} elsewhere — {{PIE|*ph₂tḗr}} "father" > {{PIE|*fədēr}} > {{PIE|*fadēr}}; {{PIE|*takéh₁-}} "to be silent" > (with added suffix) {{PIE|*takəyéti}} "(s)he is silent" > {{PIE|*þagəyiþi}} > {{PIE|*þagəiþi}} > {{PIE|*þagaiþi}}
- final /t/}}'''Loss of word-final {{PIE|/t/}}''' after unstressed syllables — {{PIE|*déḱm̥d}} "ten" > {{PIE|*tehunt}} > {{PIE|*tehun}}; {{PIE|*bʰéroyd}} "(s)he would carry, subj." > {{PIE|*berayt}} > {{PIE|*berai}}; {{PIE|*mélid}} ~ {{PIE|*mélit-}} "honey" > {{PIE|*melit}} ~ {{PIE|*melid-}} > {{PIE|*meli}} ~ {{PIE|*melid-}} > {{PIE|*mili}} ~ {{PIE|*milid-}}
- |'''{{PIE|/ɣʷ/}} > {{PIE|/w/}}''', sometimes {{PIE|/ɣ/}} — {{PIE|*snóygʷʰos}} "snow" > {{PIE|*snaygʷaz}} > {{PIE|*snaiwaz}}; {{PIE|*kʷekʷléh₂}} "wheels (collective)" > {{PIE|*hʷegʷlā}} > {{PIE|*hʷewlā}} > {{PIE|*hweulō}}
- *{{PIE|/ɑː/}} > {{PIE|/ɔː/}} — {{PIE|*dʰóh₁mos}} "thing put" > {{PIE|*dāmaz}} > {{PIE|*dōmaz}} "judgement"; {{PIE|*swā́dus}} "sweet" > {{PIE|*swātuz}} > {{PIE|*swōtuz}}
- *{{PIE|/ɑːː/}} > {{PIE|/ɔːː/}} — {{PIE|*séh₁mō}} "seeds" > {{PIE|*sēmâ}} > {{PIE|*sēmô}}; {{PIE|*-eh₂es}} "eh₂-stem nom. pl." > {{PIE|*-âz}} > {{PIE|*-ôz}}
- |{{anchor|Early i-mutation}}'''Early [[i-mutation]]''': {{PIE|/e/}} > {{PIE|/i/}} when followed by {{PIE|/i/}} or {{PIE|/j/}} in the same or next syllable — {{PIE|*
- by {{PIE|/i/}} or {{PIE|/j/}} in the same or next syllable — {{PIE|*bʰéreti}} "(s)he is carrying" > {{PIE|*beridi}} > {{PIE|*biridi}}; {{PIE|*médʰyos}} "middle" > {{PIE|*medyaz}} > {{PIE|*midjaz}}; {{PIE|*néwios}} "new" > {{PIE|*newyaz}} > {{PIE|*niwjaz}}
- *This eliminates the remaining {{PIE|/ei/}}, changing it to {{PIE|/iː/}} — {{PIE|*deywós}} "god" > {{PIE|*teywaz}} > {{PIE|*Tīwaz}} "[[Týr]]"; {{PIE|*tréyes}} "three" > {{PIE|*þreiz}} > {{PIE|*þrīz}}
- |{{anchor|Pre-nasal raising}}'''{{PIE|/e/}} > {{PIE|/i/}}''' when followed by a syllable-final nasal — {{PIE|*en}} "in" > {{PIE|*in}}; {{PIE|*séngʷʰeti}} "(s)he chants" > {{PIE|*sengʷidi}} > {{PIE|*singwidi}} "(s)he sings"
- hiatus then contract to long vowels or diphthongs — {{PIE|*-oyh₁m̥}} "thematic optative 1sg sg." > {{PIE|*-oyum}} > {{PIE|*-ayų}} > {{PIE|*-aų}}; {{PIE|*áyeri}} "in the morning" > {{PIE|*ayiri}} > {{PIE|*airi}} "early"
- *This process creates a new {{PIE|/ɑː/}} from earlier {{PIE|/ɑjɑ/}} - {{PIE|*steh₂-}} "to stand" > (with suffix added) {{PIE|*sth₂yónti}} "they stand" > {{PIE|*stayanþi}} > {{PIE|*stānþi}}
- lengthening]] and nasalisation of the preceding vowel — {{PIE|*ḱónketi}} "(s)he hangs" > {{PIE|*hanhidi}} (phonetically {{PIE|[ˈxɑ̃ːxiði]}})
- Germanic speakers in contact with the [[Continental Celtic]] [[La Tène culture|La Tène horizon]]).
- | {{IPA|p}} > {{IPA|ɸ}}
- | {{IPA|b}} > {{IPA|p}}
- | {{IPA|bʱ}} > {{IPA|b}}, {{IPA|β}}
- | {{IPA|ɸ}} > {{IPA|b}}, {{IPA|β}}
- | {{IPA|t}} > {{IPA|θ}}
- | {{IPA|d}} > {{IPA|t}}
- | {{IPA|dʱ}} > {{IPA|d}}, {{IPA|ð}}
- | {{IPA|θ}} > {{IPA|d}}, {{IPA|ð}}
- | {{IPA|k}} > {{IPA|x}}
- | {{IPA|ɡ}} > {{IPA|k}}
- | {{IPA|ɡʱ}} > {{IPA|ɡ}}, {{IPA|ɣ}}
- | {{IPA|x}} > {{IPA|ɡ}}, {{IPA|ɣ}}
- | {{IPA|kʷ}} > {{IPA|k}}<br />{{IPA|ɡʷ}} > {{IPA|ɡ}}<br />{{IPA|ɡʷʱ}} > {{IPA|ɡʱ}}
- | {{IPA|kʷ}} > {{IPA|xʷ}}
- | {{IPA|ɡʷ}} > {{IPA|kʷ}}
- | {{IPA|ɡʷʱ}} > {{IPA|ɡʷ}}, {{IPA|ɣʷ}}
- | {{IPA|xʷ}} > {{IPA|ɡʷ}}, {{IPA|ɣʷ}}
- | {{IPA|ɡʷ}} > {{IPA|b}}<br />{{IPA|ɣʷ}} > {{IPA|w}}, {{IPA|ɣ}}
- Indo-European, which was free and could occur on any syllable. For example, PIE {{PIE|*bʰréh₂tēr}} > PGmc. *brōþēr "brother" but PIE {{PIE|*meh₂tḗr}} > PGmc. *mōdēr "mother." The voicing of some {{IPA|/s/}} according to Verner's Law produced {{IPA|/z/
- voiced labiovelars. Initially, {{IPA|[ɡʷ]}} became {{IPA|[b]}}, e.g. PIE *{{PIE|gʷʱédʱyeti}} > PGmc. bidiþi "(s)he asks for". The fricative variant {{IPA|[ɣʷ]}} (which occurred in most non-
- {{PIE|h₃érō}}'' just as Lith ''akmuõ'' "stone", OSl ''kamy'' ← *''aḱmō̃'' ← PIE *''{{PIE|h₂éḱmō}}''). Contrast:
- * ''há̇r'' "shark" < ''*hą̄haz'' < PG ''*hanhaz''
- * ''ǿ̇ra'' "younger" < ''*jų̄hizô'' < PG ''*junhizô'' (cf. Gothic ''jūhiza'')
- The phonemicity is evident from minimal pairs like ''ǿ̇ra'' "younger" vs. ''ǿra'' "vex" < ''*wor-'', cognate with English ''weary''.<ref>Einar Haugen, "First Grammatical Treatise. The
- Elfdalian]] still includes nasal vowels that directly derive from Old Norse, e.g. ''gą̊s'' "goose" < Old Norse ''gás'' (presumably nasalized, although not so written); cf. German ''Gans'', showing
- [[West Frisian language|West Frisian]] ''goes'', [[North Frisian language|North Frisian]] ''goos'' < Old English/Frisian ''gōs'' < Anglo-Frisian ''*gą̄s'' < Proto-Germanic ''[[wikt:Appendix:Proto-Germanic/gans|*gans]]''
- from the loss of -j- between two vowels, which appeared in the present subjunctive of verbs: *-aų < *-ajų in the first person, *-ai- in the others. A combination of these two effects created an
- two effects created an alternation between -ā- and -ai- found in class 3 weak verbs, with -ā- < -aja- < -əja- and -ai- < -əi- < -əji-.
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