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For other irregular verbs and their common patterns, see the article on Spanish irregular verbs. The tables include only the "simple" tenses (that is, those formed with a single word), and not the "compound" tenses (those formed with an auxiliary verb plus a non-finite form of the main verb), such as the progressive, perfect, and passive voice.
The auxiliary language Interlingua has some irregular verbs, principally esser "to be", which has an irregular present tense form es "is" (instead of expected esse), an optional plural son "are", an optional irregular past tense era "was/were" (alongside regular esseva), and a unique subjunctive form sia (which can also function as an imperative).
Vowel raising appears only in verbs of the third conjugation (-ir verbs), and in this group it affects dormir, morir, podrir (alternative of the more common pudrir) and nearly all verbs which have -e-as their last stem vowel (e.g. sentir, repetir); exceptions include cernir, discernir and concernir (all three diphthongizing, e-ie).
In the Spanish language there are some verbs with irregular past participles. There are also verbs with both regular and irregular participles, in which the irregular form is most used as an adjective , while the regular form tends to appear after haber to form compound perfect tenses.
Spanish verbs form one of the more complex areas of Spanish grammar. Spanish is a relatively synthetic language with a moderate to high degree of inflection, which shows up mostly in Spanish conjugation.
Unlike tú, which has many irregular forms, the only voseo verbs that are conjugated irregularly in the indicative present are ser, ir and haber. However, haber is seldom used in the indicative present, since there is a strong tendency to use preterite instead of present perfect.
The irregular form tends to indicate duration, whereas the regular form often describes a short-term action (The fire burned for weeks. vs. He burnt his finger. ), and in American English, the regular form is associated with the literal sense of a verb, while the irregular form with a figurative one.
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 ...