We grow up hearing negative commands: Don’t bother your brother! Don’t scream! Don’t forget to do your homework! The negative tu command forms of all verbs are formed by the infinitive of the verb preceded by non:

Non andare!

Non avere!

Non dire!

Non fare!

Non mangiare!

The negative voi command forms of all verbs are formed simply by placing non before the affirmative voi form:

Non credete!

Non dormite!

Non fate!

Non finite!

Non parlate!