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The verb tables below show the main irregularities that can occur in Spanish verbs. Note that there are a few spelling rules that apply to the language as a whole and which we generally don't class as verb irregularities (e.g. a stem ending in -c- will always spell this letter as -qu- before e or i).
For an introduction to regular Spanish verbs plus an explanation of the various irregularities illustrated by the verb tables below, see the following sections of the site:
Introduction to Spanish verbs
Present tense of -ar verbs (which includes links to sections on various irregularities in the present tense)
Preterite verb forms:
a section on the preterite, one of the parts of the Spanish verb system with the most irregularities.
| abastecer | c changes to zc in yo form and throughout present subjunctive. c changes to j in preterite. |
| abducir | c changes to zc in yo form and throughout present subjunctive. c changes to j in preterite. |
| abnegar | e of stem changes to ie when stressed. |
| abrir | Past participle ends in -ierto. |
| acentuar | Last vowel of stem stressed before unstressed present tense endings. |
| acostar | o of stem changes to ue when stressed. |
| advertir | e of stem changes to ie when stressed, before preterite endings that have i vowel, and in present participle. |
| agradecer | c changes to zc in yo form and throughout present subjunctive. |
| andar | (Irregular verb.) |
| atender | e of stem changes to ie when stressed. |
| caber | (Irregular verb.) |
| caer | (Irregular verb.) |
| cocer | o of stem changes to ue when stressed. |
| competir | e of stem changes to i when stressed, before preterite endings with i in them, and in present participle |
| concluir | |
| contener | (Irregular verb.) |
| convenir | (Irregular verb.) |
| dar | (Irregular verb.) |
| deber | |
| decir | (Irregular verb.) |
| describir | Past participle ends in -scrito. |
| deshacer | (Irregular verb.) |
| dormir | (Irregular verb.) |
| encontrar | o of stem changes to ue when stressed. |
| envolver | o of stem changes to ue when stressed. Past participle ends in -uelto. |
| estar | (Irregular verb.) |
| extraer | (Irregular verb.) |
| freír | Past participle ends in -ito. |
| haber | (Irregular verb.) |
| hacer | (Irregular verb.) |
| imponer | (Irregular verb.) |
| ir | (Irregular verb.) |
| jugar | u of stem changes to ue when stressed. |
| llegar | |
| lucir | c changes to zc in yo form and throughout present subjunctive. |
| morir | (Irregular verb.) |
| oír | (Irregular verb.) |
| partir | |
| pedir | e of stem changes to i when stressed, before preterite endings with i in them, and in present participle |
| poder | (Irregular verb.) |
| poner | (Irregular verb.) |
| prever | Basically regular except for past participle visto, and ee elided to e. |
| proveer | Past participle ends in -visto. |
| querer | (Irregular verb.) |
| recocer | o of stem changes to ue when stressed. c changes to zc in yo form and throughout present subjunctive. |
| revolver | Past participle ends in -uelto. o of stem changes to ue when stressed. |
| reír | (Irregular verb.) |
| reñir | Last vowel of stem stressed before unstressed present tense endings. e of stem changes to i when stressed, before preterite endings with i in them, and in present participle |
| romper | Past participle ends in -oto. |
| saber | (Irregular verb.) |
| salir | Irregular form salgo, plus irregular future stem and imperative. |
| satisfacer | Modelled on hacer. |
| ser | (Irregular verb.) |
| soler | o of stem changes to ue when stressed. No future (or conditional) forms. This verb has no preterite (or past subjunctive). |
| tener | (Irregular verb.) |
| valer | (Irregular verb.) |
| ver | Basically regular except for past participle visto, and ee elided to e. |
| yacer | Rarely used verb with some irregularities. |
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Basic Spanish vocab