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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).
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 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:
This means that any regular Latin verb can be conjugated in any person, number, tense, mood, and voice by knowing which of the four conjugation groups it belongs to, and its principal parts. A verb that does not follow all of the standard conjugation patterns of the language is said to be an irregular verb.
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.
When the pre-contraction form of the verb contained a velar, it persisted in the past indicative plurals, past subjunctives, and past participle, and the verb assumed the characteristics (ablaut, inflection) of normal strong conjugation. Alternate, regularized past-tenses for these were also in use in some dialects, with an -ø-r or -e-r format.