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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 ...
Differences between the past tense and past participle (as in sing–sang–sung, rise–rose–risen) generally appear in the case of verbs that continue the strong conjugation, or in a few cases weak verbs that have acquired strong-type forms by analogy – as with show (regular past tense showed, strong-type past participle shown).
The past participle of regular verbs is identical to the preterite (past tense) form, described in the previous section. For irregular verbs, see English irregular verbs. Some of these have different past tense and past participle forms (like sing–sang–sung); others have the same form for both (like make–made–made).
The past participle forms the perfect aspect with the auxiliary verb have: The chicken has eaten. 5. The past participle is used to form passive voice: The chicken was eaten. Such passive participles can appear in an adjectival phrase: The chicken eaten by the children was contaminated. Adverbially:
The present participle/gerund is formed by adding -ing, again with the application of certain spelling rules similar to those that apply with -ed. The irregular verbs of English are described and listed in the article English irregular verbs (for a more extensive list, see List of English irregular verbs). In the case of these:
The past participle gotten is rarely used in modern BrE, which generally uses got except when fixed in old expressions such as ill-gotten gains and in the minority of dialects that retain the older form. The American dictionary Merriam-Webster, however, lists "gotten" as a standard past participle of "get."
The past tense of regular verbs is made by adding -d or -ed to the base form of the verb, while those of irregular verbs are formed in various ways (such as see→saw, go→went, be→was/were). With regular and some irregular verbs, the past tense form also serves as a past participle. For full details of past tense formation, see English verbs.
English past participles have both active and passive uses. In a passive use, an object or preposition complement becomes zero, the gap being understood to be filled by the noun phrase the participle modifies (compare similar uses of the to-infinitive above). Uses of past participles and participial phrases introduced by them are as follows: