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In the present perfect, the present indicative of haber is used as an auxiliary, and it is followed by the past participle of the main verb. In most of Spanish America, this tense has virtually the same use as the English present perfect: Te he dicho mi opinión = "I have told you my opinion"
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.').
The present perfect is a grammatical combination of the present tense and perfect aspect that is used to express a past event that has present consequences. [1] The term is used particularly in the context of English grammar to refer to forms like "I have finished".
Unlike tú, which has many irregular forms, the only voseo verbs that are conjugated irregularly in the indicative present are ser, ir and haber. However, haber is seldom used in the indicative present, since there is a strong tendency to use preterite instead of present perfect.
Normally, a verb would be conjugated in the present indicative to indicate an event in the present frame of time. Yo soy muy ambicioso. (I am very ambitious) Marta trae la comida. (Marta brings the food) If the sentence expresses a desire, demand, or emotion, or something similar, in the present tense, the subjunctive is used. Quiero que seas ...
The Spanish copulas are ser and estar.The latter developed as follows: stare → *estare → estar. The copula ser developed from two Latin verbs. Thus its inflectional paradigm is a combination: most of it derives from svm (to be) but the present subjunctive appears to come from sedeo (to sit) via the Old Spanish verb seer.
The verb later transformed to *haveĊ 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.
Before o (in the first person singular of the indicative present tense) and a (that is, in all persons of the present subjunctive), the so-called G-verbs (sometimes "Go-Yo verbs", "Yo-Go" verbs, or simply "Go" verbs) add a medial -g-after l and n (also after s in asir), add -ig-when the root ends in a vowel, or substitute -c-for -g-.