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The form dé is so written to distinguish it from the preposition de. Both verbs are also irregular in the preterite and derived tenses: dar follows the pattern of regular -er/-ir verbs, while estar has an anomalous preterite stem and follows the corresponding common pattern:
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 modern Spanish verb paradigm (conjugation) has 16 distinct complete [1] forms (tenses), i.e. sets of forms for each combination of tense, mood and aspect, plus one incomplete [2] tense (the imperative), as well as three non-temporal forms (the infinitive, gerund, and past participle). Two of the tenses, namely both subjunctive futures, are ...
In some verbs, the past tense, past participle, or both are identical in form to the basic (infinitive) form of the verb. This is the case with certain strong verbs, where historical sound changes have led to a leveling of the vowel modifications: for example, let has both past tense and past participle identical to the infinitive, while come ...
To form the gerund of an -ar verb, replace the -ar of the infinitive with -ando; e.g. jugar, hablar, caminar → jugando, hablando, caminando. For -er or -ir verbs, replace the -er or -ir ending with -iendo; e.g. comer, escribir, dormir → comiendo, escribiendo, durmiendo (note that dormir undergoes the stem vowel change that is typical of -ir ...
Regular in past tense and sometimes in past participle. must – (no other forms) Defective: Originally a preterite; see English modal verbs: need (needs/need) – needed – needed: Weak: Regular except in the use of need in place of needs in some contexts, by analogy with can, must, etc; [4] see English modal verbs: ought – (no other forms ...
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 auxiliary language Interlingua has some irregular verbs, principally esser "to be", which has an irregular present tense form es "is" (instead of expected esse), an optional plural son "are", an optional irregular past tense era "was/were" (alongside regular esseva), and a unique subjunctive form sia (which can also function as an imperative).