Intermediate grammar guide
Spanish irregular verbs have patterns
Group irregular forms by what changes, rather than memorising a long flat list.
Spanish irregular verbs can feel like exceptions everywhere, but many fit a small number of recurring patterns. Learning the pattern alongside one useful example makes new forms easier to recognise.
Building everyday vocabulary too? Explore the free vocabulary guides.
The idea
Understand the choice, not just the label.
Present-tense stem-changing verbs change a vowel in stressed forms but usually keep the original vowel in nosotros and vosotros: pensar → pienso, piensas, piensa, pensamos, pensáis, piensan. Common patterns include e → ie (querer), o → ue (poder) and e → i (pedir).
Some verbs have a distinctive first-person present form: tener → tengo, salir → salgo, conocer → conozco. Others are highly irregular throughout, especially ser, estar, ir and haber. Learn their actual forms rather than applying one pattern where it does not fit.
Irregularity can be tense-specific. In the preterite, tener has tuv- (tuve, tuviste…), while the future and conditional use tendr- (tendré, tendría). Many irregular preterite stems share endings, but not all past forms are predictable from the present.
| Form / pattern | Use it when… | Example |
|---|---|---|
| Stem change | vowel changes in stressed present forms | poder → puedo, puedes, puede; podemos, podéis; pueden |
| Irregular yo | special first-person present form | salir → salgo; hacer → hago |
| Irregular preterite stem | new stem plus a distinctive ending set | tener → tuve, tuviste, tuvo, tuvimos, tuvisteis, tuvieron |
| Future stem | infinitive ending stays, stem changes | decir → diré; hacer → haré |
Hear it in a sentence
Examples in everyday Spanish
¿Puedes traer también el pan?
Can you bring the bread too?
Poder changes o → ue in stressed forms.
Ayer tuve que salir antes de la reunión.
Yesterday I had to leave before the meeting.
Tener has the irregular preterite stem tuv-.
Conozco un sitio tranquilo junto al río.
I know a quiet place beside the river.
Conocer has the yo form conozco.
Look out for
Common mistakes, made clearer
Avoid
Nosotros puedemos entrar.
Use / understand
Nosotros podemos entrar.
The stem change in poder does not occur in the nosotros present form.
Avoid
Ayer tení un problema.
Use / understand
Ayer tuve un problema.
Tener uses the irregular preterite stem tuv-.
Avoid
Yo sabo la respuesta.
Use / understand
Yo sé la respuesta.
Saber has the irregular present yo form sé.
Out in the world
Everyday use
¿Hacéis la compra en el mercado de aquí?
Do you all do the shopping at the market here?
Mañana saldré tarde de la oficina.
Tomorrow I’ll leave the office late.
Five quick checks
Try it before you peek.
- 01
Complete: ¿___ (poder, tú) ayudarme con esta caja?
Reveal answer and explanation
Puedes
Poder has o → ue in the stressed tú form.
- 02
Complete: Yo ___ (hacer) una pausa a las once.
Reveal answer and explanation
hago
Hacer has the irregular present yo form hago.
- 03
Complete: El año pasado ___ (tener, nosotros) una tienda pequeña.
Reveal answer and explanation
tuvimos
Tener takes the preterite stem tuv- and nosotros ending -imos.
- 04
Complete: Vosotros ___ (pedir) la cuenta, ¿verdad?
Reveal answer and explanation
pedís
The e → i stem change does not occur in vosotros for this present form.
- 05
Complete: Te ___ (decir, yo) la verdad mañana.
Reveal answer and explanation
diré
Decir uses the irregular future stem dir- plus the future yo ending -é.
Still wondering
Questions about spanish irregular verbs have patterns
Are stem changes random?
Many common changes follow recurring groups, though a verb’s exact forms still need checking. Stress often explains why nosotros and vosotros keep the unchanged stem vowel.
Does an irregular verb stay irregular in every tense?
Not necessarily. Irregularity can be limited to particular forms or tenses; learn each verb’s pattern in the tense you are using.