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There are two kinds of changes that can affect stem vowels of some Spanish verbs: diphthongization and vowel raising. Both changes affect -e-or -o-in the last (or only) syllable of a verb stem. Diphthongization changes -e-to -ie-, and -o-to -ue-. Vowel raising changes the mid vowels-e-and -o-to the corresponding high vowels: -i-and -u-respectively.
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 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 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.
This is an Oy-Yo verb. Stem: s-, fu-, er-, se-. There are two ways to say "To be" in Spanish: ser and estar. They both mean "to be", but they are used in different ways. As a rule of thumb, ser is used to describe permanent or almost permanent conditions and estar to describe temporary ones. [11]
-s-or, -as, may be inserted between the stem and endings in the preterite and conditional (thus overlapping with the pluperfect in the latter case). Questions are formed by effecting soft mutation on the verb (the effect of the interrogative particle 'a', often elided in speech and informal writing), though increasingly the soft mutation is ...
To conjugate something that is negative in the imperative mood for the tú form (which also is used most often), conjugate in the yo form, drop the o, add the opposite tú ending (if it is an -ar verb add es; for an -er or -ir verb add as), and then put the word no in front.
In all other cases in Spanish, the stem vowel has been regularized throughout the conjugation and a new third-person ending -o adopted: hice 'I did' vs. hizo 'he did', pude 'I could' vs. pudo 'he could', etc. Portuguese verbs ending in -duzir are regular in the preterite, while their Spanish counterparts in -ducir undergo a consonant change and ...