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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 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 ...
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 traditional terms are misleading because the participles do not necessarily correspond to tense: [16] the present participle is often associated with the progressive (continuous) aspect, while the past participle is linked with the perfect aspect or passive voice. See the examples below:
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.
The verb be has the largest number of irregular forms (am, is, are in the present tense, was, were in the past tense, been for the past participle). Most of what are often referred to as verb tenses (or sometimes aspects) in English are formed using auxiliary verbs.
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.
It is formed by combining had (the past tense of auxiliary have), been (the past participle of be), and the present participle of the main verb. Uses of the past perfect progressive are analogous to those of the present perfect progressive, except that the point of reference is in the past. For example: I was tired because I had been running.