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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.
In the Spanish language there are some verbs with irregular past participles. There are also verbs with both regular and irregular participles, in which the irregular form is most used as an adjective , while the regular form tends to appear after haber to form compound perfect tenses.
The future tense of the subjunctive is found mostly in old literature or legal language and is even misused in conversation by confusing it with the past tense (often due to the similarity of its characteristic suffix, -ere, as opposed to the suffixes of the past tense, -era and -ese). It is very rare otherwise.
The past tense is a grammatical tense whose function is to place an action or situation in the past. Examples of verbs in the past tense include the English verbs sang , went and washed . Most languages have a past tense, with some having several types in order to indicate how far back the action took place.
Regarding tense agreement, if the main clause uses the imperfect, preterite, or past perfect indicative, either the imperfect or past perfect subjunctive is used. However, if the event of the subordinate clause is timelessly true, the present subjunctive is optional: " Dios decretó que las serpientes no tengan patas " ("God decreed that snakes ...
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).
A new past tense was also created in the modern languages to replace or complement the aorist and imperfect, using a periphrastic combination of the copula and the so-called "l-participle", originally a deverbal adjective. In many languages today, the copula was dropped in this formation, turning the participle itself into the past tense.