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The form dé is so written to distinguish it from the preposition de. Both verbs are also irregular in the preterite and derived tenses: dar follows the pattern of regular -er/-ir verbs, while estar has an anomalous preterite stem and follows the corresponding common pattern:
To form the gerund of an -ar verb, replace the -ar of the infinitive with -ando; e.g. jugar, hablar, caminar → jugando, hablando, caminando. For -er or -ir verbs, replace the -er or -ir ending with -iendo; e.g. comer, escribir, dormir → comiendo, escribiendo, durmiendo (note that dormir undergoes the stem vowel change that is typical of -ir ...
To conjugate something that is negative in the imperative mood for the tú form (which also is used most often), conjugate in the yo form, drop the o, add the opposite tú ending (if it is an -ar verb add es; for an -er or -ir verb add as), and then put the word no in front.
The subjunctive shows more regularity, with no stem vowel differences in singular versus plural and identical endings in both present and preterite. In the present subjunctive, the vowel is generally the same as that of the infinitive throughout, and in the preterite, the vowel is the umlauted version of the preterite plural indicative vowel.
Similarly, the participle agrees with the subject when it is used with ser to form the "true" passive voice (e.g. La carta fue escrita ayer 'The letter was written [got written] yesterday.'), and also when it is used with estar to form a "passive of result", or stative passive (as in La carta ya está escrita 'The letter is already written.').
In Latin, most verbs have four principal parts.For example, the verb for "to carry" is given as portō – portāre – portāvī – portātum, where portō is the first-person singular present active indicative ("I carry"), portāre is the present active infinitive ("to carry"), portāvī is the first-person singular perfect active indicative ("I carried"), and portātum is the neuter supine.
Preterite-present verbs were in principle weak verbs, since they formed their past tense with the weak dental suffix. However, they were unique in that their present tense forms were not those of the other verbs; rather, they were identical to the past tense forms of strong verbs. They descended from old Indo-European verbs that retained their ...
In the Germanic languages, a strong verb is a verb that marks its past tense by means of changes to the stem vowel.A minority of verbs in any Germanic language are strong; the majority are weak verbs, which form the past tense by means of a dental suffix.