Verbos irregulares en presente

Irregular verbs can fall into two categories in the present indicative: irregular in the yo form, or irregular in all forms.

Irregular in the yo form

As in every language there will be verbs that do not seem to follow any of the rules. Irregular verbs are verbs that violate conjugation rules for one or more persons and do not fall into any of the stem-changing or spelling-changing categories. And unfortunately, these are usually the most useful and regularly used words in the language. The following words are irregular only in the yo form. They are regular in all other conjugations.

Irregular yo Conjugations

caber   quepo   to fit
caer     caigo     to fall
dar       doy       to give
saber   sé          to know
traer    traigo    to bring
ver       veo       to see

The compounds of these verbs are also irregular in the yo form:

• componer, deshacer, disponer, distraer, proponer, rehacer, reponer, suponer

Irregular in all forms

There are only four verbs irregular in all forms in the present tense, but they may be the four most useful and used verbs in Spanish.

Irregular Conjugations
                                    ser                estar                 ir                haber 
yo                                soy               estoy                voy             he
tú                                 eres              estás                vas             has
usted, él, ella              es                 está                  va              ha
nosotros                     somos         estamos           vamos      hemos
vosotros                     sois              estáis                vais           habéis
ustedes, ellos, ellas   son              están                van            han

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Taken from spanishdict.com