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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.
There are three verbs that have both a regular and an irregular past participle. Both forms may be used when conjugating the compound tenses and the passive voice with the auxiliary verbs haber and ser , but the irregular form is generally the only one used as an adjective:
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.
When ser is used with the past participle of a verb, it forms the "true" passive voice, expressing an event ("El libro fue escrito en 2005"/"The book was written in 2005"). When the past participle appears with estar, it forms a "passive of result" or "stative passive" ("El libro ya está escrito"/"The book is already written"—see Spanish ...
Spanish has a number of verb tenses used to express actions or states of being in a past time frame. The two that are "simple" in form (formed with a single word, rather than being compound verbs ) are the preterite and the imperfect .
The following is a list of irregular verbs that are commonly used in standard modern English. It omits many rare, dialectal, and archaic forms, as well as most verbs formed by adding prefixes to basic verbs (unbend, understand, mistake, etc.). It also omits past participle forms that remain in use only adjectivally (clad, sodden, etc.).
With the exception of the highly irregular verb be, an English verb can have up to five forms: its plain form (or bare infinitive), a third person singular present tense, a past tense (or preterite), a past participle, and the -ing form that serves as both a present participle and gerund.
Excluding four common irregular verbs, the principal parts of all other English verbs are the infinitive, preterite and past participle. All forms of these English verbs can be derived from the three principal parts. Four verbs have an unpredictable 3rd person singular form and the verb "to be" is so irregular it has seven separate forms.