I must sew you must sew he must sew we must sew you must sew they must sew
V-ing form
I must be sewing you must be sewing he must be sewing we must be sewing you must be sewing they must be sewing
Perfect
I must have sewn you must have sewn he must have sewn we must have sewn you must have sewn they must have sewn
V-ing perfect
I must have been sewing you must have been sewing he must have been sewing we must have been sewing you must have been sewing they must have been sewing
Negation
Simple form
I must not sew you must not sew he must not sew we must not sew you must not sew they must not sew
V-ing form
I must not be sewing you must not be sewing he must not be sewing we must not be sewing you must not be sewing they must not be sewing
Perfect
I must not have sewn you must not have sewn he must not have sewn we must not have sewn you must not have sewn they must not have sewn
V-ing perfect
I must not have been sewing you must not have been sewing he must not have been sewing we must not have been sewing you must not have been sewing they must not have been sewing
Interrogative form
Simple form
must I sew? must you sew? must he sew? must we sew? must you sew? must they sew?
V-ing form
must I be sewing? must you be sewing? must he be sewing? must we be sewing? must you be sewing? must they be sewing?
Perfect
must I have sewn? must you have sewn? must he have sewn? must we have sewn? must you have sewn? must they have sewn?
V-ing perfect
must I have been sewing? must you have been sewing? must he have been sewing? must we have been sewing? must you have been sewing? must they have been sewing?
Interro-negative form
Simple form
must I not sew? must you not sew? must he not sew? must we not sew? must you not sew? must they not sew?
V-ing form
must I not be sewing? must you not be sewing? must he not be sewing? must we not be sewing? must you not be sewing? must they not be sewing?
Perfect
must I not have sewn? must you not have sewn? must he not have sewn? must we not have sewn? must you not have sewn? must they not have sewn?
V-ing perfect
must I not have been sewing? must you not have been sewing? must he not have been sewing? must we not have been sewing? must you not have been sewing? must they not have been sewing?