must stuff
Verbo regular: stuff - stuffed- stuffed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must stuff
you must stuff
he must stuff
we must stuff
you must stuff
they must stuff 	I must be stuffing
you must be stuffing
he must be stuffing
we must be stuffing
you must be stuffing
they must be stuffing	I must have stuffed
you must have stuffed
he must have stuffed
we must have stuffed
you must have stuffed
they must have stuffed	I must have been stuffing
you must have been stuffing
he must have been stuffing
we must have been stuffing
you must have been stuffing
they must have been stuffing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not stuff
you must not stuff
he must not stuff
we must not stuff
you must not stuff
they must not stuff 	I must not be stuffing
you must not be stuffing
he must not be stuffing
we must not be stuffing
you must not be stuffing
they must not be stuffing	I must not have stuffed
you must not have stuffed
he must not have stuffed
we must not have stuffed
you must not have stuffed
they must not have stuffed	I must not have been stuffing
you must not have been stuffing
he must not have been stuffing
we must not have been stuffing
you must not have been stuffing
they must not have been stuffing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I stuff?
must you stuff?
must he stuff?
must we stuff?
must you stuff?
must they stuff? 	must I be stuffing?
must you be stuffing?
must he be stuffing?
must we be stuffing?
must you be stuffing?
must they be stuffing? 	must I have stuffed?
must you have stuffed?
must he have stuffed?
must we have stuffed?
must you have stuffed?
must they have stuffed? 	must I have been stuffing?
must you have been stuffing?
must he have been stuffing?
must we have been stuffing?
must you have been stuffing?
must they have been stuffing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not stuff?
must you not stuff?
must he not stuff?
must we not stuff?
must you not stuff?
must they not stuff? 	must I not be stuffing?
must you not be stuffing?
must he not be stuffing?
must we not be stuffing?
must you not be stuffing?
must they not be stuffing? 	must I not have stuffed?
must you not have stuffed?
must he not have stuffed?
must we not have stuffed?
must you not have stuffed?
must they not have stuffed? 	must I not have been stuffing?
must you not have been stuffing?
must he not have been stuffing?
must we not have been stuffing?
must you not have been stuffing?
must they not have been stuffing?