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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 ...
They exhibit different stem vowels in the present and preterite (a result of umlaut from the "-jan" ending). Weak, Class II verbs exhibit no changes in the stem vowels in the present and preterite, i.e., the stem vowel in the present tense remains the same in the preterite (as well as in the past participle).
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 verb wit is the only non-modal verb that is also a preterite-present verb and it does not take -s in the third person. It also has a vowel shift in the present tense as in "I wot". For shortened forms of certain verbs and of their negations (' s, ' re, won't, etc.), see English auxiliaries and contractions.
So-called "preterite-present verbs" are a feature of Germanic languages that have a present tense formed like the past tense (or "preterite") of strong verbs. The verbs often have the semantics of modal verbs , and in fact the present-day English modal verbs "can, could, may, might, shall, should, must" are descended from Old English preterite ...
The preterite-presents are verbs whose present tenses look like the past tenses of strong verbs. This resemblance is not coincidental, since they descend from Proto-Indo-European stative verbs, which normally developed into the past tense of Germanic languages. The preterite-present verbs are an exception to this development, remaining as ...
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.