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