Nisam glupI'm not stupid (male)to make "not be" constructions, just add 'ni-' before "to be" - Nisam - I'm not, Nisi - You're not, Nije - He/she/it is notNoteto make "not be" constructions, just add 'ni-' before "to be" - Nisam - I'm not, Nisi - You're not, Nije - He/she/it is not