must use
Verbo regular: use - used- used

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must use
you must use
he must use
we must use
you must use
they must use 	I must be using
you must be using
he must be using
we must be using
you must be using
they must be using	I must have used
you must have used
he must have used
we must have used
you must have used
they must have used	I must have been using
you must have been using
he must have been using
we must have been using
you must have been using
they must have been using	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not use
you must not use
he must not use
we must not use
you must not use
they must not use 	I must not be using
you must not be using
he must not be using
we must not be using
you must not be using
they must not be using	I must not have used
you must not have used
he must not have used
we must not have used
you must not have used
they must not have used	I must not have been using
you must not have been using
he must not have been using
we must not have been using
you must not have been using
they must not have been using	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I use?
must you use?
must he use?
must we use?
must you use?
must they use? 	must I be using?
must you be using?
must he be using?
must we be using?
must you be using?
must they be using? 	must I have used?
must you have used?
must he have used?
must we have used?
must you have used?
must they have used? 	must I have been using?
must you have been using?
must he have been using?
must we have been using?
must you have been using?
must they have been using? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not use?
must you not use?
must he not use?
must we not use?
must you not use?
must they not use? 	must I not be using?
must you not be using?
must he not be using?
must we not be using?
must you not be using?
must they not be using? 	must I not have used?
must you not have used?
must he not have used?
must we not have used?
must you not have used?
must they not have used? 	must I not have been using?
must you not have been using?
must he not have been using?
must we not have been using?
must you not have been using?
must they not have been using?