English verb conjugation
MUST MAR

Regular verb: mar - marred - marred

Affirmation

Simple form	V-ing form
I must mar you must mar she must mar we must mar you must mar they must mar	I must be marring you must be marring she must be marring we must be marring you must be marring they must be marring
Perfect	V-ing perfect
I must have marred you must have marred she must have marred we must have marred you must have marred they must have marred	I must have been marring you must have been marring she must have been marring we must have been marring you must have been marring they must have been marring

Negation

Simple form	V-ing form
I must not mar you must not mar she must not mar we must not mar you must not mar they must not mar	I must not be marring you must not be marring she must not be marring we must not be marring you must not be marring they must not be marring
Perfect	V-ing perfect
I must not have marred you must not have marred she must not have marred we must not have marred you must not have marred they must not have marred	I must not have been marring you must not have been marring she must not have been marring we must not have been marring you must not have been marring they must not have been marring

Interrogative form

Simple form	V-ing form
must I mar? must you mar? must she mar? must we mar? must you mar? must they mar?	must I be marring? must you be marring? must she be marring? must we be marring? must you be marring? must they be marring?
Perfect	V-ing perfect
must I have marred? must you have marred? must she have marred? must we have marred? must you have marred? must they have marred?	must I have been marring? must you have been marring? must she have been marring? must we have been marring? must you have been marring? must they have been marring?

Interro-negative form

Simple form	V-ing form
must I not mar? must you not mar? must she not mar? must we not mar? must you not mar? must they not mar?	must I not be marring? must you not be marring? must she not be marring? must we not be marring? must you not be marring? must they not be marring?
Perfect	V-ing perfect
must I not have marred? must you not have marred? must she not have marred? must we not have marred? must you not have marred? must they not have marred?	must I not have been marring? must you not have been marring? must she not have been marring? must we not have been marring? must you not have been marring? must they not have been marring?