I must chew you must chew he must chew we must chew you must chew they must chew
V-ing form
I must be chewing you must be chewing he must be chewing we must be chewing you must be chewing they must be chewing
Perfect
I must have chewed you must have chewed he must have chewed we must have chewed you must have chewed they must have chewed
V-ing perfect
I must have been chewing you must have been chewing he must have been chewing we must have been chewing you must have been chewing they must have been chewing
Negation
Simple form
I must not chew you must not chew he must not chew we must not chew you must not chew they must not chew
V-ing form
I must not be chewing you must not be chewing he must not be chewing we must not be chewing you must not be chewing they must not be chewing
Perfect
I must not have chewed you must not have chewed he must not have chewed we must not have chewed you must not have chewed they must not have chewed
V-ing perfect
I must not have been chewing you must not have been chewing he must not have been chewing we must not have been chewing you must not have been chewing they must not have been chewing
Interrogative form
Simple form
must I chew? must you chew? must he chew? must we chew? must you chew? must they chew?
V-ing form
must I be chewing? must you be chewing? must he be chewing? must we be chewing? must you be chewing? must they be chewing?
Perfect
must I have chewed? must you have chewed? must he have chewed? must we have chewed? must you have chewed? must they have chewed?
V-ing perfect
must I have been chewing? must you have been chewing? must he have been chewing? must we have been chewing? must you have been chewing? must they have been chewing?
Interro-negative form
Simple form
must I not chew? must you not chew? must he not chew? must we not chew? must you not chew? must they not chew?
V-ing form
must I not be chewing? must you not be chewing? must he not be chewing? must we not be chewing? must you not be chewing? must they not be chewing?
Perfect
must I not have chewed? must you not have chewed? must he not have chewed? must we not have chewed? must you not have chewed? must they not have chewed?
V-ing perfect
must I not have been chewing? must you not have been chewing? must he not have been chewing? must we not have been chewing? must you not have been chewing? must they not have been chewing?