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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 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").
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 Modern Greek, the present tense is used in a similar way to the present tense in English and can represent the present continuous as well. As with some other conjugations in Greek, some verbs in the present tense accept different (but equivalent) forms of use for the same person.
This is followed by the simple past tense , and then the past participle. If there are irregular present tense forms (see below), these are given in parentheses after the infinitive. (The present participle and gerund forms of verbs, ending in -ing, are always regular. In English, these are used as verbs, adjectives, and nouns.)
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).
The absolute/conjunct distinction is retained in the habitual present tense (also used as, and often referred to as, the future tense) of regular and many irregular verbs. In these cases, the independent form of the verb ends in -(a)idh (cf. Old Irish gaibid above), while the dependent form drops this ending (cf. Old Irish ·gaib above).
The pronunciation of the past tense ending follows similar rules to those for the third person present tense ending described above: if the base form ends in /t/ or /d/ then a new syllable /ɪd/ or /əd/ is added (as in drifted, exceeded); if the base form ends in an unvoiced consonant sound other than /t/ then the ending is pronounced /t/ (as ...