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Some verbs (including most G-verbs and most verbs ending in -ducir) have a somewhat different stem in the preterite. These stems are very old and often are found in Latin as well. The same irregular stem is also found in the imperfect subjunctive (both in -ra and -se forms) and the future subjunctive.
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 ...
To form the gerund of an -ar verb, replace the -ar of the infinitive with -ando; e.g. jugar, hablar, caminar → jugando, hablando, caminando. 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 ...
For other irregular verbs and their common patterns, see the article on Spanish irregular verbs. The tables include only the "simple" tenses (that is, those formed with a single word), and not the "compound" tenses (those formed with an auxiliary verb plus a non-finite form of the main verb), such as the progressive, perfect, and passive voice.
Virtually all verbs of the third conjugation (-ir), if they have an -e-or -o-as the last vowel of their stem, undergo a vowel-raising change whereby e changes to i and o changes to u, in some of their forms (for details, see Spanish irregular verbs).
'Verbal voseo ' refers to the use of the verb conjugation of vos regardless of which pronoun is used. [2] Verbal voseo with a pronoun other than vos is widespread in Chile, in which case one would use the pronoun tú and the verb conjugation of vos at the same time. E.g.: tú venís, tú escribís, tú podís, tú sabís, tú vai, tú estái.
Navajo vowel ablaut, depending on the verb, may be a change in vowel, vowel length, nasality, and/or tone. For example, the verb stem kaah/-ką́ 'to handle an open container' has a total of 16 combinations of the 5 modes and 4 aspects, resulting in 7 different verb stem forms (i.e. -kaah, -kááh, -kaał, -kááł, -ka’, -ká, -ką́).
Verbs with devoicing of the ending and no other irregularity: burn, dwell, learn, smell, spell, spill and spoil. Most of these have regular -ed forms as alternatives. Verbs continuing the Rückumlaut pattern: bring–brought, buy–bought, seek–sought, sell–sold, teach–taught, tell–told, and think–thought.