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This group of verbs—which originated in the Latin inchoative verbs but now includes other verbs as well—substitute -zc-for stem-final -c-before o and a. The group includes nearly all verbs ending in -acer (except hacer and derived verbs), -ecer (except mecer and remecer ), -ocer (except cocer and derived verbs), and -ucir .
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.
(There is another class of stem-changing verbs which alternate /i, u/ with /ɛ, ɔ/ according to the same scheme); In central Portugal, the 1st. person plural of verbs of the 1st. conjugation (with infinitives in -ar) has the stressed vowel /ɐ/ in the present indicative, but /a/ in the preterite, cf. pensamos ('we think') with pensámos ('we
In linguistics, apophony (also known as ablaut, (vowel) gradation, (vowel) mutation, alternation, internal modification, stem modification, stem alternation, replacive morphology, stem mutation, or internal inflection) is an alternation of vowel (quality) within a word that indicates grammatical information (often inflectional).
In the preterite tense, a number of irregular verbs in Portuguese change the stem vowel to indicate differences between first and third person singular: fiz 'I did' vs. fez 'he did', pude 'I could' vs. pôde 'he could', fui 'I was' vs. foi 'he was', tive 'I had' vs. teve 'he had', etc. Historically, these vowel differences are due to vowel ...
In Navajo, verbs have (often multiple) morphemes prefixed onto the verb stem. These prefixes are added to the verb stem in a set order in a prefix positional template. Although prefixes are generally found in a specific position, some prefixes change order by the process of metathesis.
In linguistics, a word stem is a part of a word responsible for its lexical meaning. Typically, a stem remains unmodified during inflection with few exceptions due to apophony (for example in Polish, miast-o ("city") and w mieść-e ("in the city"); in English, sing, sang, and sung, where it can be modified according to morphological rules or peculiarities, such as sandhi).
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.