must alter
Verbo regular: alter - altered- altered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must alter
you must alter
she must alter
we must alter
you must alter
they must alter 	I must be altering
you must be altering
she must be altering
we must be altering
you must be altering
they must be altering	I must have altered
you must have altered
she must have altered
we must have altered
you must have altered
they must have altered	I must have been altering
you must have been altering
she must have been altering
we must have been altering
you must have been altering
they must have been altering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not alter
you must not alter
she must not alter
we must not alter
you must not alter
they must not alter 	I must not be altering
you must not be altering
she must not be altering
we must not be altering
you must not be altering
they must not be altering	I must not have altered
you must not have altered
she must not have altered
we must not have altered
you must not have altered
they must not have altered	I must not have been altering
you must not have been altering
she must not have been altering
we must not have been altering
you must not have been altering
they must not have been altering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I alter?
must you alter?
must she alter?
must we alter?
must you alter?
must they alter? 	must I be altering?
must you be altering?
must she be altering?
must we be altering?
must you be altering?
must they be altering? 	must I have altered?
must you have altered?
must she have altered?
must we have altered?
must you have altered?
must they have altered? 	must I have been altering?
must you have been altering?
must she have been altering?
must we have been altering?
must you have been altering?
must they have been altering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not alter?
must you not alter?
must she not alter?
must we not alter?
must you not alter?
must they not alter? 	must I not be altering?
must you not be altering?
must she not be altering?
must we not be altering?
must you not be altering?
must they not be altering? 	must I not have altered?
must you not have altered?
must she not have altered?
must we not have altered?
must you not have altered?
must they not have altered? 	must I not have been altering?
must you not have been altering?
must she not have been altering?
must we not have been altering?
must you not have been altering?
must they not have been altering?