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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.
In er and ir verbs, the first person singular of the present indicative and the whole present subjunctive are the only forms whose endings start with o/a instead of e/i. These two different phonetic environments made Latin forms evolve differently in many verbs, leading to irregularities.
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.
-ar verbs-er and -ir verbs Remarks yo-e-a tú/vos-es-as: For vos, the Real Academia Española prescribes Rioplatense Spanish: ames, comas and partas: vos-és-ás: In Central America, amés, comás, and partás are the preferred present subjunctive forms of vos, but they are not accepted by the Real Academia Española [9] él/ella/ello/usted-e-a
Verbs in Interlingue have three endings: -ar, -er, and -ir. Conjugation is performed with a combination of endings and auxiliary verbs. The verb esser (to be) is exceptional in being written es in the present tense, though the esse form is seen in the imperative. [5]
The table at the right shows the main verb forms, with examples for -ar, -er and -ir verbs (based on parlar 'to speak', vider 'to see', and audir 'to hear'). The simple past, future, and conditional tenses correspond to semantically identical compound tenses (composed of auxiliary verbs plus infinitives or past participles).
Butt and Benjamin provide a number of common combinations of tenses: if the main clause is in the present tense, one has to use the present subjunctive for the dependent clause, but the present perfect subjunctive if the comment made is about a past event – the imperfect subjunctive may be used as well, replacing the latter; if the main ...
The third person singular present tense is formed regularly, except in the case of the modal verbs (can, shall, etc.) which do not add -s, the verb be (which has three present indicative forms: am, is and are), and the three verbs have, do and say, which produce the forms has, does (pronounced with a short vowel, /dʌz/), and says (pronounced ...