Spanish irregular verbs Totally Explained

Everything about Spanish Irregular Verbs totally explained

Spanish verbs are a complex area of Spanish grammar, with many combinations of tenses, aspects and moods (up to fifty conjugated forms per verb). While conjugation rules are relatively straightforward, a large number of verbs are irregular. Among these, some fall into more-or-less defined deviant patterns, while others are uniquely irregular. This article tries to summarize the common irregular patterns.
As in all Romance languages, many irregularities in Spanish verbs can be retraced to Latin grammar.

Vowel-alternating verbs

Vowel-alternating verbs, also known as stem-changing verbs, have two stems; one is the common infinitive stem (the one that serves to conjugate regular verbs) and the other derives from it by a vowel change. The change turns e into ie and o into ue when the syllable in question is stressed, which in effect happens only in the singular persons and third-person plural of the present indicative, present subjunctive, and present imperative. (Note that the dictionary form always has the vowel, not the diphthong, since in the infinitive form the stress is on the last syllable, for example on the thematic vowel.)
For example (only some persons and tenses, for contrasting purposes):

acertar → yo acierto, él acierta, nosotros acertamos, ellos aciertan; que yo acierte; yo acerté, él acertó...
soldar → yo sueldo, él suelda, nosotros soldamos, ellos sueldan; que yo suelde; yo soldé, él soldó...
perder → yo pierdo, él pierde, nosotros perdemos, ellos pierden; que yo pierda; yo perdí, él perdió...
mentir → yo miento, él miente, nosotros mentimos, ellos mienten; que yo mienta; yo mentí, él mintió...
apostar → yo apuesto, él apuesta, nosotros apostamos, ellos apuestan; que yo apueste; yo aposté, él apostó...
moler → yo muelo, él muele, nosotros molemos, ellos muelen; que yo muela; yo molí, él molió...

To complicate matters further, vowel-alternating verbs in the third conjugation (-ir) furthermore change e to i and o to u in certain unstressed cases — the third person singular and plural of the present subjunctive (and imperative, when the subjunctive is used as the imperative) and the second and third persons plural of the preterite:

mentir → que yo mienta, que él mienta, que nosotros mintamos; yo mentí, él mintió, nosotros mentimos...

concebir → yo concibo, él concibe, nosotros concebimos; yo concebí, él concibió... In some dialects, the second-person singular present tense is different, and gets stressed on the last syllable instead of the root, so the alternation doesn't take place: tú pides becomes vos pedís, tú mueres becomes vos morís. See Voseo for details.
Many verbs with e or o in the root don't alternate (for example meter, comer, etc.), and they're often a source of mistakes for children learning to speak, and also for some adults.

rebosar → *yo rebueso, *él rebuesa... instead of yo reboso, él rebosa...

G-verbs

The so-called G-verbs (sometimes "yo-go" verbs) add a medial -g- in the first person singular, present tense (-ig- when the root ends in a vowel). Many of these verbs are also irregular in other ways. For example:
ť poner: yo pongo, tú pones...

tener: yo tengo, tú tienes... ť caer: yo caigo, tú caes...

traer: yo traigo, tú traes... ť oír: yo oigo, tú oyes...

Anomalous stems

Some verbs (including most G-verbs) have a completely different stem in the preterite. This stem is anomalous also because it's stressed in some persons (while in all other cases the preterite gets the stress over the suffix). These stems are very old and are often found in Latin as well. ť poner → pus-: yo puse, tú pusiste, él puso, nosotros pusimos...

   estar → estuv-: yo estuve, tú estuviste, él estuvo, nosotros estuvimos... ť hacer → hic-, hiz-: yo hice, tú hiciste, él hizo, nosotros hicimos...

   andar → anduv-: yo anduve, tú anduviste, él anduvo, nosotros anduvimos... ť conducir → conduj-: yo conduje, tu condujiste, él condujo, nosotros condujimos...

   decir → dij-: yo dije, tú dijiste, él dijo, nosotros dijimos... ť tener → tuv-: yo tuve, tú tuviste, él tuvo, nosotros tuvimos...

Some verbs also change their stem in the future and conditional tenses: ť tener → tendr-: yo tendré, tú tendrás, él tendrá...

   hacer → har-: yo haré, tú harás, él hará... ť decir → dir-: yo diré, tú dirás, él dirá...

   haber → habr-: yo habré, tú habrás, él habrá... Yet some other verbs take several different (but phonetically related) stems, in the most irregular fashion:
ť caber: yo quepo, tú cabes, él cabe...; yo cupe, tú cupiste, él cupo...

   saber: yo sé, tú sabes...; yo supe, tú supiste...; yo sabía, tú sabías...; yo sepa, tú sepas ť haber: yo he, tú has, él ha, nosotros hemos, vosotros habéis, ellos han

Others

The verbs 'ser' (to be) and 'ir' (to go) both exhibit irregularities in the present, imperfect and preterite tenses.

Present indicative tense

	ser	ir
yo	soy	voy
vos/tú	sos/eres	vas
él, ella	es	va
nosotros	somos	vamos
vosotros	sois	vais
ellos, ellas	son	van

	ser	ir
yo	era	iba
vos/tú	eras	ibas
él, ella	era	iba
nosotros	éramos	íbamos
vosotros	erais	ibais
ellos, ellas	eran	iban

	ser	ir
yo	fui	fui
vos/tú	fuiste	fuiste
él, ella	fue	fue
nosotros	fuimos	fuimos
vosotros	fuisteis	fuisteis
ellos, ellas	fueron	fueron

Further Information

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