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The verbs ser (to be) and ir (to go) both exhibit irregularities in the present, imperfect and preterite forms (note that these two verbs have the same preterite fui). Together with ver (to see) and prever (to foresee), they are the only four verbs with irregular imperfect indicative.
The preterite or preterit (/ ˈ p r ɛ t ər ɪ t / PRET-ər-it; abbreviated PRET or PRT) is a grammatical tense or verb form serving to denote events that took place or were completed in the past; in some languages, such as Spanish, French, and English, it is equivalent to the simple past tense.
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 ...
The preterite and past participle forms of irregular verbs follow certain patterns. These include ending in -t (e.g. build , bend , send ), stem changes (whether it is a vowel, such as in sit , win or hold , or a consonant, such as in teach and seek , that changes), or adding the [ n ] suffix to the past participle form (e.g. drive , show , rise ).
The English language has many irregular verbs, approaching 200 in normal use – and significantly more if prefixed forms are counted. In most cases, the irregularity concerns the past tense (also called preterite) or the past participle.
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 ...
Six morphological forms for tenses, aspects, and/or moods—present, preterite, imperfect, pluperfect, future, and conditional. Three (or four) moods—indicative, subjunctive, imperative (and conditional, according to some authors) Classes with an asterisk are entirely periphrastic. The passive voice can be constructed in two different ways.