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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 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 tense and past participle are identical; they are formed with the ending -ed, which as in the previous case has three different pronunciations (/t/, /d/, /ɪd/). Certain spelling rules apply, including the doubling of consonants before the ending in forms like conned and preferred .
The first sentence is in the past tense (were), but a present participle expresses the progressive aspect (be standing). The second sentence is in the future tense (will), but a past participle is used for the perfect aspect (have cleaned).
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).
Examples which combine both types of tense marking include the French passé composé, which has an auxiliary verb together with the inflected past participle form of the main verb; and the Irish past tense, where the proclitic do (in various surface forms) appears in conjunction with the affixed or ablaut-modified past tense form of the main verb.
An English irregular verb’s simple past tense form is typically distinct from its past participle (with which the auxiliary to have constructs the past perfect), as in went vs. have gone (of to go), despite them being the same for regular verbs, as in demanded vs. have demanded (of to demand).
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.