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