Imperative form of irregular verbs

Some verbs are irregular in the direct imperative form:

Essere (to be)

Sii (tu)
Siate (voi)

Avere (to have)

Abbi (tu)
Abbiate (voi)

Sapere (to know)

Sappi (tu)
Sappiate (voi)

Other irregular imperative and monosyllabic verbs have two forms in the 2nd person singular:

Dare (to give)

Da’/ Dai (tu)

Fare (to do/make)

Fa’/ Fai (tu)

Stare (to stay)

Sta’/ Stai (tu)

Andare (to go)

Va’/ Vai (tu)

Attention! When we use the imperative form with pronouns we can only use the truncated form (da’, fa’, sta’, va’) and the consonant of the pronoun doubles (except for the pronoun “gli”).

Dammi le buste della spesa! Sono troppo pesanti per te!
(Give me the shopping bags! They are too heavy for you!)

L’aereo di Carla atterra alle nove. Valla a prendere tu, per favore: io ho la macchina guasta.
(Carla’s plane lands at 9. Go and pick her up please, my car has broken down.)

È un momento difficile per Luca. Stagli vicino!
(It’s a difficult time for Luca. Be there for him!)

The verb “dire”(to say), monosyllabic, has only the truncated form in the 2nd person singular.

Dire (to say)

Di’ (tu)

When we use the imperative form with pronouns, the consonant of the pronoun doubles (except for the pronoun “gli”).

Dai, dimmi come è andato il tuo appuntamento, sono curiosa!
(Come on, tell me how your date went, I really want to know!)

Se vedi Giorgio digli di farsi sentire.
(If you see Giorgio, tell him to get in touch.)

See also:

Italian Grammar: Imperative form of irregular verbs

Italian Exercises: Imperative Form

Italian Course Exercises – Unit 6: Verbi Irregolari – L’Imperativo – C’è/Ci sono

Italian Imperative Form Video Exercise