I must man you must man he must man we must man you must man they must man
V-ing form
I must be manning you must be manning he must be manning we must be manning you must be manning they must be manning
Perfect
I must have manned you must have manned he must have manned we must have manned you must have manned they must have manned
V-ing perfect
I must have been manning you must have been manning he must have been manning we must have been manning you must have been manning they must have been manning
Negation
Simple form
I must not man you must not man he must not man we must not man you must not man they must not man
V-ing form
I must not be manning you must not be manning he must not be manning we must not be manning you must not be manning they must not be manning
Perfect
I must not have manned you must not have manned he must not have manned we must not have manned you must not have manned they must not have manned
V-ing perfect
I must not have been manning you must not have been manning he must not have been manning we must not have been manning you must not have been manning they must not have been manning
Interrogative form
Simple form
must I man? must you man? must he man? must we man? must you man? must they man?
V-ing form
must I be manning? must you be manning? must he be manning? must we be manning? must you be manning? must they be manning?
Perfect
must I have manned? must you have manned? must he have manned? must we have manned? must you have manned? must they have manned?
V-ing perfect
must I have been manning? must you have been manning? must he have been manning? must we have been manning? must you have been manning? must they have been manning?
Interro-negative form
Simple form
must I not man? must you not man? must he not man? must we not man? must you not man? must they not man?
V-ing form
must I not be manning? must you not be manning? must he not be manning? must we not be manning? must you not be manning? must they not be manning?
Perfect
must I not have manned? must you not have manned? must he not have manned? must we not have manned? must you not have manned? must they not have manned?
V-ing perfect
must I not have been manning? must you not have been manning? must he not have been manning? must we not have been manning? must you not have been manning? must they not have been manning?