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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.
For example, él, ella, or usted can be replaced by a noun phrase, or the verb can appear with impersonal se and no subject (e.g. Aquí se vive bien, 'One lives well here'). The first-person plural expressions nosotros , nosotras , tú y yo , or él y yo can be replaced by a noun phrase that includes the speaker (e.g. Los estudiantes tenemos ...
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 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 ...
A form used for centuries but never accepted normatively has an -s ending in the second person singular of the preterite or simple past. For example, lo hicistes instead of the normative lo hiciste; hablastes tú for hablaste tú. That is the only instance in which the tú form does not end in an -s in the normative language.
Only ser is used to equate one noun phrase with another, and thus it is the verb for expressing a person's occupation ("Mi hermano es estudiante"/"My brother is a student"). For the same reason, ser is used for telling the date or the time, regardless of whether the subject is explicit ("Hoy es miércoles"/"Today is Wednesday") or merely ...
For example, bore and found may be past tenses of bear and find, but may also represent independent (regular) verbs of different meaning. Another example is lay , which may be the past tense of lie , but is also an independent verb (regular in pronunciation, but with irregular spelling: lay–laid–laid ).
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 ...