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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 verbs haber and tener are easily distinguished, but they may pose a problem for learners of Spanish who speak other Romance languages (where the cognates of haber and tener are used differently), for English speakers (where "have" is used as a verb and as an auxiliary), and others. Haber derives from Latin habeō, with the basic meaning of ...
This is done in the following way: if the verb is an -er or -ir verb such as comer, poder, vivir, or compartir, replace the ending o with an a i.e. : Yo como; yo puedo; yo vivo → Yo coma; yo pueda; yo viva. If the verb is an -ar verb such as hablar or caminar replace the ending o with an e: i.e., Yo hablo; yo camino → Yo hable, yo camine.
The perfect form, constructed by the future subjunctive of haber with a past participle, denotes an action as if it had been performed before another future event; more common nowadays is to use either future perfect indicative or present perfect subjunctive.
In grammar, a future tense (abbreviated FUT) is a verb form that generally marks the event described by the verb as not having happened yet, but expected to happen in the future. An example of a future tense form is the French achètera , meaning "will buy", derived from the verb acheter ("to buy").
Vowel raising appears only in verbs of the third conjugation (-ir verbs), and in this group it affects dormir, morir, podrir (alternative of the more common pudrir) and nearly all verbs which have -e-as their last stem vowel (e.g. sentir, repetir); exceptions include cernir, discernir and concernir (all three diphthongizing, e-ie).
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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.