In linguistics and etymology, suppletion is the use as an inflected form of a word of an entirely different word that is not cognate to the uninflected form. Here are some examples:
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.)
In English, the comparative[?] of good is better, the superlative[?] is best; these represent a root that was originally independent of good.
In English, the complicated irregular verbbe / is / were has forms from several different roots: be originally comes from Indo-European*bhu-; am, is and are from *es-, and was and were from *wes-.
Also in English, the word people is often used as the plural form of the unrelated word person (from the Latin words populus and persona, respectively.)
In Italian, forms such as io vado, tu vai, lui va are part of the conjugation of the verb andare ("to go"). Compare the Spanishyo voy, tú vas, él va, nosotros vamonos... (ir "to go") and yo ando, tú andas, él anda... (andar "to walk"), two separate verbs.
Indeed, the verb "to go" has a variety of suppletive forms in Romance languages. Compare the following paradigms (the first three are from French):
the infinitive aller, and present nous allons, vous allez; (of obscure Latin origin, either from ambulare, "walk" or a backformation from allatus, past participle of afferre, "carry." Allatus from afferre is itself a suppletive form in Latin.)
the present je vais, tu vas, il va, ils vont; (from Latin vadare, "wander.")
the future j'irai, tu iras, il ira... and conditional j'irais etc.); (from Latin ire, "go")
and, in Spanish, the preterite yo fui, tú fuiste, él fue (identical to the preterite of ser "to be").
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