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The past participle is used to form the compound pasts (e.g. ho lavorato, avevo lavorato, ebbi lavorato, avrò lavorato). Regular verbs follow a predictable pattern, but there are many verbs with an irregular past participle. verbs in -are add -ato to the stem: parlato, amato; some verbs in -ere add -uto to the stem: creduto;
The verb later transformed to *haveō in many Romance languages (but etymologically Spanish haber), resulting in irregular indicative present forms *ai, *as, and *at (all first-, second- and third-person singular), but ho, hai, ha in Italian and -pp-(appo) in Logudorese Sardinian in present tenses.
The past participle is used in Italian as both an adjective and to form many of the compound tenses of the language. There are regular endings for the past participle, based on the conjugation class . There are, however, many irregular forms as not all verbs follow the pattern, particularly the -ere verbs.
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 past tense of the subjunctive mood has one form for all persons and numbers of all the verbs, which is să fi followed by the past participle of the verb. The past subjunctive is used after the past optative-conditional of the verbs that require the subjunctive (a trebui, a vrea, a putea, a fi bine, a fi necesar, etc.), in constructions ...
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 ...
This has happened in the case of the English word went, which was originally the past tense of wend, but has come to be used instead as the past tense of go. The verb be also has a number of suppletive forms (be, is, was, etc., with various different origins) – this is common for copular verbs in Indo-European languages.
In English, regular verbs form their past tense and past participle with the ending -[e]d. Therefore, verbs like play, arrive and enter are regular, while verbs like sing, keep and go are irregular. Irregular verbs often preserve patterns that were regular in past forms of the language, but which have now become anomalous; in rare cases, there ...