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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 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).
This is done in the following way: if the verb is an -er or -ir verb such as comer, poder, vivir, or compartir, replace the ending o with an a i.e. : Yo como; yo puedo; yo vivo → Yo coma; yo pueda; yo viva. If the verb is an -ar verb such as hablar or caminar replace the ending o with an e: i.e., Yo hablo; yo camino → Yo hable, yo camine.
(A verb with a weak preterite.) A number of English verbs form their preterites by suppletion, a result of either ablaut, a regular set of sound changes (to an interior vowel) in the conjugation of a strong verb, or because the verb conjugations are the remains of a more complex system of tenses in irregular verbs: She went to the cinema ...
There are only three irregular verbs in the imperfect: ir, ser, and ver. Historically, ir — unlike other Spanish "-ir verbs" — failed to drop the -b-of the Latin imperfect. The imperfect of ser is likewise a continuation of the Latin imperfect (of esse), with the same stem appearing in tú eres (thanks to pre-classical Latin rhotacism).
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.
A verb that does not follow all of the standard conjugation patterns of the language is said to be an irregular verb. The system of all conjugated variants of a particular verb or class of verbs is called a verb paradigm; this may be presented in the form of a conjugation table.