Modern Spanish Grammar: A Practical Guide

16.1.2.8 Irregular imperatives

16.1.2.9 Ser and ir
Ser and ir are so irregular that they must be given special attention.
Ser‘to be’ Ir‘to go’

(a) Present

soy voy

eres (sos) vas

es va

somos vamos

sois vais

son van

(b) Imperfect

era iba

eras ibas

era iba

éramos íbamos

erais ibais

eran iban

(c) Preterite see 16.1.2.5

NOTE Ser and ir have the same forms in the preterite.

(d) Future and conditional

Regular (seré, etc.; sería, etc.) Regular (iría, etc.; iría, etc.)

(e) Present subjunctive

sea vaya

seas (seás) vayas (vayás)

sea vaya

seamos vayamos

seáis vayáis

sean vayan

Infinitive 2nd person singular imperative

Hacer‘to do’, ‘to make’ (and its compounds) haz

Ir‘to go’ ve

Poner‘to put’, ‘to place’ (and its compounds) pon

Salir‘to go out’ sal (salí)

Ser‘to be’ sé

Venir‘to come’ (and its compounds) ven

VERB FORMS 16.1