I must power you must power he must power we must power you must power they must power
V-ing form
I must be powering you must be powering he must be powering we must be powering you must be powering they must be powering
Perfect
I must have powered you must have powered he must have powered we must have powered you must have powered they must have powered
V-ing perfect
I must have been powering you must have been powering he must have been powering we must have been powering you must have been powering they must have been powering
Negation
Simple form
I must not power you must not power he must not power we must not power you must not power they must not power
V-ing form
I must not be powering you must not be powering he must not be powering we must not be powering you must not be powering they must not be powering
Perfect
I must not have powered you must not have powered he must not have powered we must not have powered you must not have powered they must not have powered
V-ing perfect
I must not have been powering you must not have been powering he must not have been powering we must not have been powering you must not have been powering they must not have been powering
Interrogative form
Simple form
must I power? must you power? must he power? must we power? must you power? must they power?
V-ing form
must I be powering? must you be powering? must he be powering? must we be powering? must you be powering? must they be powering?
Perfect
must I have powered? must you have powered? must he have powered? must we have powered? must you have powered? must they have powered?
V-ing perfect
must I have been powering? must you have been powering? must he have been powering? must we have been powering? must you have been powering? must they have been powering?
Interro-negative form
Simple form
must I not power? must you not power? must he not power? must we not power? must you not power? must they not power?
V-ing form
must I not be powering? must you not be powering? must he not be powering? must we not be powering? must you not be powering? must they not be powering?
Perfect
must I not have powered? must you not have powered? must he not have powered? must we not have powered? must you not have powered? must they not have powered?
V-ing perfect
must I not have been powering? must you not have been powering? must he not have been powering? must we not have been powering? must you not have been powering? must they not have been powering?