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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 ...
Present tense: Remove the infinitival -r. Exception: es for esser (to be) Additional exceptions: ha for haber (to have), va for vader (to go) Past tense: Replace the infinitival -r with -t. Replace the final -r with -va. Optional irregular forms: era instead of esseva for esser: Past participle: Replace the infinitival -r with -te.
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.
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 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.
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.
The present indicative of most verbs in modern English has the same form as the infinitive, except for the third-person singular form, which takes the ending -[e]s.The verb be has the forms am, is, are.
It is formed with the present tense of the auxiliary have (namely have or has) and the past participle of the main verb. The choice of present perfect or past tense depends on the frame of reference (period or point in time) in which the event is conceived as occurring. If the frame of reference extends to the present time, the present perfect ...