must be
Verbo irregular: be - was/were- been

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must be
you must be
she must be
we must be
you must be
they must be 	I must be being
you must be being
she must be being
we must be being
you must be being
they must be being	I must have been
you must have been
she must have been
we must have been
you must have been
they must have been	I must have been being
you must have been being
she must have been being
we must have been being
you must have been being
they must have been being	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not be
you must not be
she must not be
we must not be
you must not be
they must not be 	I must not be being
you must not be being
she must not be being
we must not be being
you must not be being
they must not be being	I must not have been
you must not have been
she must not have been
we must not have been
you must not have been
they must not have been	I must not have been being
you must not have been being
she must not have been being
we must not have been being
you must not have been being
they must not have been being	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I be?
must you be?
must she be?
must we be?
must you be?
must they be? 	must I be being?
must you be being?
must she be being?
must we be being?
must you be being?
must they be being? 	must I have been?
must you have been?
must she have been?
must we have been?
must you have been?
must they have been? 	must I have been being?
must you have been being?
must she have been being?
must we have been being?
must you have been being?
must they have been being? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not be?
must you not be?
must she not be?
must we not be?
must you not be?
must they not be? 	must I not be being?
must you not be being?
must she not be being?
must we not be being?
must you not be being?
must they not be being? 	must I not have been?
must you not have been?
must she not have been?
must we not have been?
must you not have been?
must they not have been? 	must I not have been being?
must you not have been being?
must she not have been being?
must we not have been being?
must you not have been being?
must they not have been being?