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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-.
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 choice between present subjunctive and imperfect subjunctive is determined by the tense of the main verb of the sentence. The future subjunctive is rarely used in modern Spanish and mostly appears in old texts, legal documents, and certain fixed expressions, such as venga lo que viniere ("come what may").
There are two main impersonal verbs in Spanish: haber (to have, to be (there is/are, there were)) and hacer (to do). 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).
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 ...
In order to explain and understand present tense, it is useful to imagine time as a line on which the past tense, the present and the future tense are positioned. The term present tense is usually used in descriptions of specific languages to refer to a particular grammatical form or set of forms; these may have a variety of uses, not all of ...
This means that any regular Latin verb can be conjugated in any person, number, tense, mood, and voice by knowing which of the four conjugation groups it belongs to, and its principal parts. A verb that does not follow all of the standard conjugation patterns of the language is said to be an irregular verb.
Differences between the past tense and past participle (as in sing–sang–sung, rise–rose–risen) generally appear in the case of verbs that continue the strong conjugation, or in a few cases weak verbs that have acquired strong-type forms by analogy – as with show (regular past tense showed, strong-type past participle shown).