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The verbs ser (to be) and ir (to go) both exhibit irregularities in the present, imperfect and preterite forms (note that these two verbs have the same preterite fui). Together with ver (to see) and prever (to foresee), they are the only four verbs with irregular imperfect indicative.
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). In -er verbs (and some -ir verbs, like disminuir) whose stem ends with a vowel, the i of the -iendo ending is replaced by y: e.g. leer ...
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).
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.
Unlike tú, which has many irregular forms, the only voseo verbs that are conjugated irregularly in the indicative present are ser, ir and haber. However, haber is seldom used in the indicative present, since there is a strong tendency to use preterite instead of present perfect.
In stem-changing verbs where the stressed stem vowel diphthongizes, this results in the usual diphthongization, ie. duérmanos for durmamos, piérdanos for perdamos. [69] The second-person preterite forms -ates, -ites alongside the more widespread -astes, -istes and the standard -aste, -iste. [17]
The US will honor the late former President Jimmy Carter, who died at age 100 on December 29. President Joe Biden declared January 9 as a day of mourning in an executive order – the same day as ...
For English it is a practical concept, because the forms that change are seen as whole words. But in Spanish the forms that change are the "stems" of verbs (which are bound to "endings"). So the information you are looking for is in the article, but it is called by other terms, such as "stem-changing".