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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.
The verbs dar (to give) and estar (to be) both exhibit irregularities in the present indicative and present subjunctive because their stems cannot be stressed (in dar the stem is just d-, in estar it was originally st-). The form dé is so written to distinguish it from the preposition de.
The 16 "regular" forms (tenses) include 8 simple tenses and 8 compound tenses. The compound tenses are formed with the auxiliary verb haber plus the past participle . Verbs can be used in other forms, such as the present progressive, but in grammar treatises they are not usually considered a part of the paradigm but rather periphrastic verbal ...
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.
The Spanish copulas are ser and estar.The latter developed as follows: stare → *estare → estar. The copula ser developed from two Latin verbs. Thus its inflectional paradigm is a combination: most of it derives from svm (to be) but the present subjunctive appears to come from sedeo (to sit) via the Old Spanish verb seer.
The verb later transformed to *haveĊ in many Romance languages (but etymologically Spanish haber), resulting in irregular indicative present forms *ai, *as, and *at (all first-, second- and third-person singular), but ho, hai, ha in Italian and -pp-(appo) in Logudorese Sardinian in present tenses.
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 ...
The progressive present is a grammatical tense that is used only if an action is actually in progress at the time. For example, in Spanish , "estoy leyendo" means "I am reading (right now)." It is formed by using the present indicative of estar plus the present participle of the verb.