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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.
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]
A considerable number of verbs change the vowel e in the stem to the diphthong ie, and the vowel o to ue. This happens when the stem vowel receives the stress. These verbs are referred to as stem-changing verbs.
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 verbs).
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 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.
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For most regular verbs ending in -ir, the vos imperatives use the same conjugations as the yo form in the preterite; almost all verbs that are irregular in the preterite (which are denoted by ‡) retain the regular vos imperative forms.