Irregular verbs in Spanish are verbs that do not follow the standard conjugation patterns of regular -ar, -er, or -ir verbs. Instead, they undergo changes in their stems or endings in certain tenses, moods, or persons. These verbs are essential to master because they are often very common and indispensable for everyday communication.
  • Some verbs are only irregular in certain tenses (e.g., andar, tener).
  • Some are irregular in multiple tenses and forms (ser, ir, dar).
  • Learning irregular verbs helps with fluency and comprehension.
Answer: Irregular verbs are those that do not follow the usual conjugation rules for -ar, -er, or -ir, and they often include some of the most common verbs.

Common Types of Irregularities

Irregularities in Spanish verbs can occur in various ways:
  • Stem changes: The root of the verb changes (e.g., pensarpienso).
  • Unique stems: Some verbs use a different stem in certain tenses (tenertuv- in preterite).
  • Irregular endings: Some verbs have unusual endings (estar, andar).
  • Complete irregularity: Some verbs are fully irregular (ser, ir).
Verbs can become irregular through stem changes, unique stems, or irregular endings.

Examples of Important Irregular Verbs

VerbMeaningIrregularity TypeExample (Yo Present)Example (Preterite Yo)
SerTo beFully irregularSoyFui
IrTo goFully irregularVoyFui
DarTo giveIrregular endingsDoyDi
EstarTo beStem + endingsEstoyEstuve
TenerTo haveStem change + uniqueTengoTuve
HacerTo do/makeUnique stemHagoHice
VenirTo comeStem change + uniqueVengoVine
'Ser', 'Ir', 'Tener', and 'Hacer' are common irregular verbs.

Irregular Verb Families

Many irregular verbs fall into families with similar patterns:
  • “Go” verbs: Poner (pongo), salir (salgo), traer (traigo)
  • “U” stem verbs: Tener (tuve), andar (anduve), estar (estuve)
  • “I” stem verbs: Hacer (hice), venir (vine), querer (quise)
  • “J” stem verbs: Decir (dije), traer (traje), conducir (conduje)
U, I, and J are common irregular stems; Z stem is not used.

Conclusion

Irregular verbs are essential in Spanish because they include some of the most frequently used verbs and deviate from standard patterns. Mastering their unique forms and families will greatly improve your fluency and comprehension.
  • Irregular verbs don’t follow the usual -ar/-er/-ir patterns in all forms.
  • They use stem changes, unique roots, or special endings.
  • Many common verbs are irregular, so they’re vital to learn.
Irregular verbs are common and essential, so learning them is key to fluency.