Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I must sew up you must sew up he must sew up we must sew up you must sew up they must sew up
V-ing form
I must be sew uping you must be sew uping he must be sew uping we must be sew uping you must be sew uping they must be sew uping
Perfect
I must have sew uped you must have sew uped he must have sew uped we must have sew uped you must have sew uped they must have sew uped
V-ing perfect
I must have been sew uping you must have been sew uping he must have been sew uping we must have been sew uping you must have been sew uping they must have been sew uping
Negation
Simple form
I must not sew up you must not sew up he must not sew up we must not sew up you must not sew up they must not sew up
V-ing form
I must not be sew uping you must not be sew uping he must not be sew uping we must not be sew uping you must not be sew uping they must not be sew uping
Perfect
I must not have sew uped you must not have sew uped he must not have sew uped we must not have sew uped you must not have sew uped they must not have sew uped
V-ing perfect
I must not have been sew uping you must not have been sew uping he must not have been sew uping we must not have been sew uping you must not have been sew uping they must not have been sew uping
Interrogative form
Simple form
must I sew up? must you sew up? must he sew up? must we sew up? must you sew up? must they sew up?
V-ing form
must I be sew uping? must you be sew uping? must he be sew uping? must we be sew uping? must you be sew uping? must they be sew uping?
Perfect
must I have sew uped? must you have sew uped? must he have sew uped? must we have sew uped? must you have sew uped? must they have sew uped?
V-ing perfect
must I have been sew uping? must you have been sew uping? must he have been sew uping? must we have been sew uping? must you have been sew uping? must they have been sew uping?
Interro-negative form
Simple form
must I not sew up? must you not sew up? must he not sew up? must we not sew up? must you not sew up? must they not sew up?
V-ing form
must I not be sew uping? must you not be sew uping? must he not be sew uping? must we not be sew uping? must you not be sew uping? must they not be sew uping?
Perfect
must I not have sew uped? must you not have sew uped? must he not have sew uped? must we not have sew uped? must you not have sew uped? must they not have sew uped?
V-ing perfect
must I not have been sew uping? must you not have been sew uping? must he not have been sew uping? must we not have been sew uping? must you not have been sew uping? must they not have been sew uping?