must walk
Verbo regular: walk - walked- walked

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

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

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

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