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