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The preterite and past participle forms of irregular verbs follow certain patterns. These include ending in -t (e.g. build , bend , send ), stem changes (whether it is a vowel, such as in sit , win or hold , or a consonant, such as in teach and seek , that changes), or adding the [ n ] suffix to the past participle form (e.g. drive , show , rise ).
There are only three irregular verbs in the imperfect: ir, ser, and ver. Historically, ir — unlike other Spanish "-ir verbs" — failed to drop the -b-of the Latin imperfect. The imperfect of ser is likewise a continuation of the Latin imperfect (of esse), with the same stem appearing in tú eres (thanks to pre-classical Latin rhotacism).
Irregular verbs in Modern English include many of the most common verbs: the dozen most frequently used English verbs are all irregular. New verbs (including loans from other languages, and nouns employed as verbs) usually follow the regular inflection, unless they are compound formations from an existing irregular verb (such as housesit, from ...
The past participle (participio pasado or participio pasivo) is regularly formed with one of the suffixes -ado or -ido (-ado for verbs ending in "-ar" and -ido for verbs ending in "-er" or "-ir"; but some verbs have an irregular form ending in -to (e.g. escrito, visto, puesto), or -cho (e.g. dicho, hecho). [32]
The verbs do, say and have additionally have irregular third person singular present tense forms (see below). The copular verb be is highly irregular, with the forms be, am, is, are, was, were, been and being. On the other hand, modal verbs (such as can and must) are defective verbs, being used only in a limited number of forms.
The verbs ser (to be) and ir (to go) both exhibit irregularities in the present, imperfect and preterite forms (note that these two verbs have the same preterite fui). Together with ver (to see) and prever (to foresee), they are the only four verbs with irregular imperfect
Therefore, for a verb like salir with the "irregular" first person salgo, the present subjunctive would be salga (not sala). Likewise, the imperfect and future subjunctives are formed from the preterit stem, so that with pud- the stem of the preterit of poder , as in yo pude 'I was able', the imperfect and future subjunctives are pudiera ...
Examples of verbs that have anomalous stems in the preterite include most verbs ending in -ducir as well as most verbs that are irregular in the "yo" form of the present tense (including traer). In most Iberian Mainland Spanish and, to a lesser extent, Mexican Spanish, there is still a strong distinction between the preterite and the present ...