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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 ...
In some verbs, the past tense, past participle, or both are identical in form to the basic (infinitive) form of the verb. This is the case with certain strong verbs, where historical sound changes have led to a leveling of the vowel modifications: for example, let has both past tense and past participle identical to the infinitive, while come ...
The term present participle is sometimes used to include the gerund; [20] the term "gerund–participle" is also used to indicate the verb form. The past participle, also sometimes called the passive or perfect participle, is identical to the past tense form (ending in -ed) in the case of regular verbs, for example "loaded", "boiled", "mounted ...
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 often ends in "n", " d" or "ed".) The past and past participle forms change in spelling sometimes. The present participle/gerund is formed regularly, in -ing (except for those defective verbs, such as the modals, which lack such a form).
As with present participles, past participles may function as simple adjectives: "the burnt logs"; "we were very excited". These normally represent the passive meaning of the participle, although some participles formed from intransitive verbs can be used in an active sense: "the fallen leaves"; "our fallen comrades".
The past participle adjective repeated becomes repeatedly by adding -ly after it. [citation needed] Most adverbs form comparatives and superlatives by modification with more and most: often, more often, most often; smoothly, more smoothly, most smoothly (see also comparison of adjectives, above).
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.