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The auxiliary language Interlingua has some irregular verbs, principally esser "to be", which has an irregular present tense form es "is" (instead of expected esse), an optional plural son "are", an optional irregular past tense era "was/were" (alongside regular esseva), and a unique subjunctive form sia (which can also function as an imperative).
The second preterite stem is used for second-person singular, and all persons in the plural (as well as the preterite subjunctive). Strong verbs also exhibit i-mutation of the stem in the second- and third-person singular in the present tense, and sometimes in the first person as well (especially class II, III, IV and V verbs).
The past tense is a grammatical tense whose function is to place an action or situation in the past. Examples of verbs in the past tense include the English verbs sang , went and washed . Most languages have a past tense, with some having several types in order to indicate how far back the action took place.
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 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 ).
For group 2b verbs, the past tense ends in -te and the past participle in -t, -t, and -ta; e.g. the past tense of heta ("to be called") is hette. For group 3 verbs, the stem ends in a vowel that is not -a , the infinitive is the same as the stem, the present tense ends in -r , the past tense in -dde , the supine in -tt , and the past participle ...
3rd conjugation: loquor, loquī, locūtus sum – to speak, say 4th conjugation: mentior, mentīrī, mentītus sum – to tell a lie. Deponent verbs use active conjugations for tenses that do not exist in the passive: the gerund, the supine, the present and future participles and the future infinitive.
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).