Suppletion

In English, the past tense of the verb go is went, which comes from the past tense of the verb wend, archaic in this sense. (The modern past tense of wend is wended.) See Go (verb). The Romance languages have a variety of suppletive forms in conjugating the verb "to go", as these first-person singular forms illustrate:

The sources of these forms, numbered in the table, are four different Latin verbs:

1. vādere ‘to go, proceed’,[7]
2. īre ‘to go’
3. ambitāre ‘to go around’,[8] also the source for Spanish and Portuguese andar ‘to walk’
4. ambulāre ‘to walk’, reflected in Fr. aller
5. fuī suppletive perfective of esse ‘to be’.[9]

Many of the Romance languages use forms from different verbs in the present tense; for example, French has je vais ‘I go’ from vadere, but nous allons ‘we go’ from ambulare. Galician-Portuguese has a similar example: imos from ire ‘to go’ and vamos from vadere ‘we go’; the former is somewhat disused in modern Portuguese but very alive in modern Galician. Even ides, from itis second-person plural of ire, is the only form for ‘you (plural) go’ both in Galician and Portuguese (Spanish vais, from vadere).

Similarly, the Welsh verb mynd ‘to go’ has a variety of suppletive forms such as af ‘I shall go’ and euthum ‘we went’. Irish téigh ‘to go’ also has suppletive forms: dul ‘going’ and rachaidh ‘will go’.

In Estonian, the inflected forms of the verb minna ‘to go’ were originally those of a verb cognate with the Finnish lähteä ‘to leave’.

• In Germanic, Romance (except Romanian), Celtic, Slavic (except Bulgarian and Macedonian), and Indo-Iranian languages, the comparative and superlative of the adjective "good" is suppletive; in many of these languages the adjective "bad" is also suppletive.

Language	Adjective	Etymology	Comparative	Superlative	Etymology
English	good	Proto-Germanic *gōdaz (Old English: gōd, OHG guot, Old Dutch *guot, and ON góðr),[10] cognate to Sanskrit: gadhya "what one clings to"	better	best	Proto-Germanic *batizô,[10] of which Old English: betera, cognate to Old English: bōt "remedy" and Sanskrit: bhadra "fortunate"
Danish	god		bedre	bedst
German	gut		besser	besten
Faroese	góður		betri	bestur
Icelandic	góður		betri	bestur
Dutch	goed		beter	best
Norwegian	god		bedre	best
Swedish	god		bättre	bäst
French	bon	Latin: bonus, from OL duenos, cognate to Sanskrit: duva "reverence"	meilleur		Latin: melior, cognate to multus "many", Greek: μαλα, romanized: mala "very"
Portuguese	bom		melhor
Spanish	bueno		mejor
Catalan	bo		millor
Italian	buono		migliore
Scottish Gaelic	math	Proto-Celtic *matis < PIE *meh₂- ("ripen, mature")	feàrr		Proto-Celtic *werros < PIE *wers- ("peak")
Irish	maith		fearr
Breton	mat		gwell, gwelloc'h1	gwellañ1	1Proto-Celtic *u̯el-no- ; 2Proto-Celtic *u̯or-gous-on
Welsh	da	Proto-Celtic *dagos ("good, well")	gwell1	gorau2
Polish	dobry	Proto-Slavic *dobrъ	lepszy	najlepszy	PIE *lep- / *lēp- ("behoof", "boot", "good" )
Czech	dobrý		lepší	nejlepší
Slovak	dobrý		lepší	najlepší
Ukrainian	добрий		ліпший	найліпший
Russian	хороший, khoroshiy	probably from Proto-Slavic *xorb[11]	лучше, luchshe	(наи)лучший, (nai)luchshiy	Old Russian лучии, neut. луче, Old Church Slavonic лоучии "more suitable, appropriate"[11]
Serbo-Croatian	dobar	Proto-Slavic *dobrъ	bolji	najbolji	Proto-Slavic *bolьjь ("bigger")
Slovene	dober		boljši	najboljši
Persian	خوب‎, khūb [xʊb][lower-alpha 1]	probably cognate of Proto-Slavic *xorb (above). Not a satisfactory etymology for beh; but see comparative and superlative forms in comparison to Germanic	خوبتر‎, xūb-tar or بِهْتَر‎, beh-tar[lower-alpha 2]	خوبترین‎, xūb-tarīn or بِهْتَرين‎, beh-tarīn	Not clear if cognate of Germanic "better" (above)[lower-alpha 3]

• The comparison of "good" is also suppletive in Finnish: hyvä → parempi.

† These are adverbial forms ("badly"); the Italian adjective is itself suppletive (cattivo, from the same root as "captive", respectively) whereas the French mauvais is compound (latin malifātius < malus+fatum).

* Mal is used in Catalan before nouns, the form after nouns (dolent) is also suppletive (< Latin dolente "painful").

Similarly to the Italian noted above, the English adverb form of "good" is the unrelated word "well", from Old English wel, cognate to wyllan "to wish".

Celtic languages:

small, smaller, smallest

Language	Adjective	Comparative / superlative
Irish	beag (Old Irish bec < Proto-Celtic *bikkos)	níos lú / is lú (< Old Irish laigiu < Proto-Celtic *lagyūs < PIE *h₁lengʷʰ- ("lightweight"))
Welsh	bach (< Brythonic *bɨx < Proto-Celtic *bikkos)	llai / lleiaf (< PIE *h₁lengʷʰ- (“lightweight”))

great, greater, greatest

Language	Adjective	Comparative / superlative
Irish	mór (< Proto-Celtic *māros < PIE *moh₁ros)	mó < Proto-Celtic *māyos < PIE *meh₁-)
Welsh	mawr (< Proto-Celtic *māros < PIE *moh₁ros)	mwy / mwyaf < Proto-Celtic *māyos < PIE *meh₁-)

In many Slavic languages, great and small are suppletive:

small, smaller, smallest

Language	Adjective	Comparative / superlative
Polish	mały	mniejszy / najmniejszy
Czech	malý	menší / nejmenší
Slovak	malý	menší / najmenší
Ukrainian	малий, маленький	менший / найменший
Russian	маленький (malen'kiy)	меньший / наименьший (men'she / naimen'shiy)

great, greater, greatest

Language	Adjective	Comparative / superlative
Polish	duży	większy / największy
Czech	velký	větší / největší
Slovak	veľký	väčší / najväčší
Ukrainian	великий	більший / найбільший

In Albanian there are 14 irregular verbs divided into suppletive and non-suppletive:

Verb	Meaning	Present	Preterite	Imperfect
qenë	to be	jam	qeshë	isha
pasur	to have	kam	pata	kisha
ngrënë	to eat	ha	hëngra	haja
ardhur	to come	vij	erdha	vija
dhënë	to give	jap	dhashë	jepja
parë	to see	shoh	pashë	shihja
rënë	to fall, strike	bie	rashë	bija
prurë	to bring	bie	prura	bija
ndenjur	to stay	rri	ndenja	rrija

Ancient Greek had a large number of suppletive verbs. A few examples, listed by principal parts:

• erkhomai, eîmi/eleusomai, ēlthon, elēlutha, —, — "go, come".
• legō, eraō (erô) / leksō, eipon / eleksa, eirēka, eirēmai / lelegmai, elekhthēn / errhēthēn "say, speak".
• horaō, opsomai, eidon, heorāka / heōrāka, heōrāmai / ōmmai, ōphthēn "see".
• pherō, oisō, ēnegka / ēnegkon, enēnokha, enēnegmai, ēnekhthēn "carry".
• pōleō, apodōsomai, apedomēn, peprāka, peprāmai, eprāthēn "sell".

In Bulgarian, the word човек, chovek ("man", "human being") is suppletive. The strict plural form, човеци, chovetsi, is used only in Biblical context. In modern usage it has been replaced by the Greek loan хора, khora. The counter form (the special form for masculine nouns, used after numerals) is suppletive as well: души, dushi (with the accent on the first syllable). For example, двама, трима души, dvama, trima dushi ("two, three people"); this form has no singular either. (A related but different noun is the plural души, dushi, singular душа, dusha ("soul"), both with accent on the last syllable.)

In English, the complicated irregular verb to be has forms from several different roots:

• be, been, being—from Old English bēon ("to be, become"), from Proto-Germanic *beuną ("to be, exist, come to be, become"), from Proto-Indo-European *bʰúHt (“to grow, become, come into being, appear”), from the root *bʰuH- ("to become, grow, appear").
• am, is, are—from Middle English am, em, is, aren, from Old English eam, eom, is, earun, earon, from Proto-Germanic *immi, *izmi, *isti, *arun, all forms of the verb *wesaną ("to be; dwell"), from Proto-Indo-European *h₁ésmi ("I am, I exist"), from the root *h₁es- ("to be").
• was, were—from Old English wæs, wǣre, from Proto-Germanic *was, *wēz, from the Proto-Indo-European root *h₂wes- ("to dwell, reside")

This verb is suppletive in most Indo-European languages, as well as in some non-Indo-European languages such as Finnish.

An incomplete suppletion exists in English with the plural of person (from the Latin persona). The regular plural persons occurs mainly in legalistic use. More commonly, the singular of the unrelated noun people (from Latin populus) is used as the plural; for example, "two people were living on a one-person salary" (note the plural verb). In its original sense of "populace, ethnic group", people is itself a singular noun with regular plural peoples.

Several irregular Irish verbs are suppletive:

• abair (to say): derived from Old Irish as·beir, from Proto-Indo-European roots *h₁eǵʰs- ("out") and *bʰer- ("bear, carry"). However, the verbal noun rá is derived from Old Irish rád, ultimately from Proto-Indo-European *reh₂dʰ- ("perform successfully").
• bí (to be): derived from Proto-Indo-European *bʰuH- ("grow, become, come into being, appear"). However, the present tense form tá is derived from Old Irish at·tá, from Proto-Celtic *ad-tāyeti, ultimately from Proto-Indo-European *steh₂- ("stand").
• beir (to catch): derived from Proto-Indo-European *bʰer- ("bear, carry"). However, the past tense form rug is derived from Old Irish rouic, which is from Proto-Celtic *ɸro-ōnkeyo-, ultimately from Proto-Indo-European roots *pro- ("forth, forward") and *h₂neḱ- ("reach").
• feic (to see): derived from Old Irish aicci, from Proto-Indo-European *kʷey- ("observe"). However, the past tense form chonaic is derived from Old Irish ad·condairc, ultimately from Proto-Indo-European *derḱ₂- ("see").
• téigh (to go): derived from Old Irish téit, from Proto-Indo-European *stéygʰeti- ("to be walking, to be climbing"). However, the future form rachaidh is derived from Old Irish regae, ultimately from Proto-Indo-European *h₁r̥gʰ- ("go, move"), while the verbal noun dul is from *h₁ludʰét ("arrive").

There are several suppletive comparative and superlative forms in Irish; in addition to the ones listed above, there is:

• fada, "long"; comparative níos faide or níos sia — fada is from Old Irish fota, from Proto-Indo-European *wasdʰos (“long, wide”); compare Latin vāstus (“wide”), while sia is from Old Irish sír ("long, long-lasting"), from Proto-Celtic *sīros (“long”); compare Welsh/Breton hir.[12][13][14][15]

Latin has several suppletive verbs. A few examples, listed by principal parts:

• sum, esse, fuī, futūrus - "be".
• ferō, ferre, tulī or tetulī, lātus - "carry, bear".
• fīō, fierī, factus sum (suppletive and semi-deponent) - "become, be made, happen"
• tollō, tollere, sustulī, sublātus - "raise, lift, elevate".

In some Slavic languages, a few verbs have imperfective and perfective forms arising from different roots. For example, in Polish:

Note that z—, przy—, w—, and wy— are prefixes and are not part of the root

In Polish, the plural form of rok ("year") is lata which comes from the plural of lato ("summer"). A similar suppletion occurs in Russian: год, romanized: god ("year") > лет, let (genitive of "years").

The Romanian verb a fi ("to be") is suppletive and irregular, with the infinitive coming from Latin fieri, but conjugated forms from forms of Latin sum. For example, eu sunt ("I am"), tu ești ("you are"), eu am fost ("I have been"), eu eram ("I used to be"), eu fusei/fui ("I was"); while the subjunctive, also used to form the future in o să fiu ("I will be/am going to be"), is linked to the infinitive.

In Russian, the word человек, chelovek ("man, human being") is suppletive. The strict plural form, человеки, cheloveki, is used only in Orthodox Church contexts. It may have originally been the unattested *человекы, *cheloveky. In any case, in modern usage, it has been replaced by люди, lyudi, the singular form of which is known in Russian only as a component of compound words (such as простолюдин, prostolyudin). This suppletion also exists in Polish (człowiek > ludzie), Czech (člověk > lidé), Serbo-Croatian (čovjek > ljudi),[16] and Slovene (človek > ljudje).

The term "suppletion" is also used in the looser sense when there is a semantic link between words but not an etymological one; unlike the strict inflectional sense, these may be in different lexical categories, such as noun/verb.[17][18]

English noun/adjective pairs such as father/paternal or cow/bovine are also referred to as collateral adjectives. In this sense of the term, father/fatherly is non-suppletive. Fatherly is derived from father, while father/paternal is suppletive. Likewise cow/cowish is non-suppletive, while cow/bovine is suppletive.

In these cases, father/pater- and cow/bov- are cognate via Proto-Indo-European, but 'paternal' and 'bovine' are borrowings into English (via Old French and Latin). The pairs are distantly etymologically related, but the words are not from a single Modern English stem.

The term "weak suppletion" is sometimes used in contemporary synchronic morphology in reference to sets of stems whose alternations cannot be accounted for by synchronically productive phonological rules. For example, the two forms child/children are etymologically from the same source, but the alternation does not reflect any regular morphological process in modern English: this makes the pair appear to be suppletive, even though the forms go back to the same root.

In that understanding, English has abundant examples of weak suppletion in its verbal inflection: e.g. bring/brought, take/took, see/saw, etc. Even though the forms are etymologically related in each pair, no productive morphological rule can derive one form from the other in synchrony. Alternations just have to be learned by speakers — in much the same way as truly suppletive pairs such as go/went.

Such cases, which were traditionally simply labelled "irregular", are sometimes described with the term "weak suppletion", so as to restrict the term "suppletion" to etymologically unrelated stems.