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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.
The present tense can replace not only the perfect tense, but also sometimes the imperfect tense: [40] tōtīs trepidātur castrīs (Caesar) [41] 'in the whole camp there is panic' (i.e. people were panicking) After dum 'while', in a past context, the present indicative regularly has the meaning of an imperfect tense: [42]
The present progressive is formed by first conjugating the verb estar or seguir, depending on context, to agree with the subject, and then attaching a gerund of the verb that follows. The past (imperfect) progressive simply requires the estar or seguir to be conjugated, depending on context, in imperfect, with respect to the subject.
To form the imperfect for French regular verbs, take the first person plural present tense, the "nous" (we) form, subtract the -ons suffix, and add the appropriate ending (the forms for être (to be), whose "nous" form does not end in -ons, are irregular; they start with ét-but have the same endings). Verbs that terminate in a stem of -cer and ...
The present/imperfective system in turn can be conjugated in two tenses, described here as present and past but traditionally known as present and imperfect. The traditional terms are based on the names of the corresponding forms in Ancient Greek (also applied to Sanskrit), and are still commonly encountered.
The usual Past Imperfective tense, or simply the Imperfect tense, is made with the tense-marker -ma-. The tones are the same as for the Present Continuous and the Recent Past, that is, there is a tone on the syllable immediately after -ma. The negative also has a tone after -ma-: síndímathándiza "I wasn't helping". [102]