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The phrase haber que (in the third person singular and followed by a subordinated construction with the verb in the infinitive) carries the meaning of necessity or obligation without specifying an agent. It is translatable as "it is necessary", but a paraphrase is generally preferable in translation. Note that the present-tense form is hay.
The progressive aspects (also called "continuous tenses") are formed by using the appropriate tense of estar + present participle (gerundio), and the perfect constructions are formed by using the appropriate tense of haber + past participle (participio). When the past participle is used in this way, it invariably ends with -o.
Haber is an irregular verb. When used as an impersonal verb in the present tense, it has a special conjugation for the third person singular (hay). Clauses with the verb haber do not have an explicit subject; its only argument is a direct object noun phrase that does not agree with the verb. Haber has its 'natural meaning' of tener 'to have'. [10]
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.
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 ...
A number of multi-word constructions exist to express the combinations of present tense with the basic form of the present tense is called the simple present; there are also constructions known as the present progressive (or present continuous) (e.g. am writing), the present perfect (e.g. have written), and the present perfect progressive (e.g ...
There are four simple tenses: the present, past, future, and conditional. The present tense can be formed from the infinitive by removing the final -r. It covers the simple and continuous present tenses in English. The verbs esser 'to be', haber 'to have', and vader 'to go' normally take the short forms es, ha, and va rather than esse, habe ...
The Portuguese present perfect form conveys a true perfect aspect. Modern Portuguese differs from Spanish in that the auxiliary used is normally ter (Spanish tener) rather than haver (Spanish haber). Furthermore, the meaning of the present perfect is different from that in Spanish in that it implies an iterative aspect.