I must skewer you must skewer he must skewer we must skewer you must skewer they must skewer
V-ing form
I must be skewering you must be skewering he must be skewering we must be skewering you must be skewering they must be skewering
Perfect
I must have skewered you must have skewered he must have skewered we must have skewered you must have skewered they must have skewered
V-ing perfect
I must have been skewering you must have been skewering he must have been skewering we must have been skewering you must have been skewering they must have been skewering
Negation
Simple form
I must not skewer you must not skewer he must not skewer we must not skewer you must not skewer they must not skewer
V-ing form
I must not be skewering you must not be skewering he must not be skewering we must not be skewering you must not be skewering they must not be skewering
Perfect
I must not have skewered you must not have skewered he must not have skewered we must not have skewered you must not have skewered they must not have skewered
V-ing perfect
I must not have been skewering you must not have been skewering he must not have been skewering we must not have been skewering you must not have been skewering they must not have been skewering
Interrogative form
Simple form
must I skewer? must you skewer? must he skewer? must we skewer? must you skewer? must they skewer?
V-ing form
must I be skewering? must you be skewering? must he be skewering? must we be skewering? must you be skewering? must they be skewering?
Perfect
must I have skewered? must you have skewered? must he have skewered? must we have skewered? must you have skewered? must they have skewered?
V-ing perfect
must I have been skewering? must you have been skewering? must he have been skewering? must we have been skewering? must you have been skewering? must they have been skewering?
Interro-negative form
Simple form
must I not skewer? must you not skewer? must he not skewer? must we not skewer? must you not skewer? must they not skewer?
V-ing form
must I not be skewering? must you not be skewering? must he not be skewering? must we not be skewering? must you not be skewering? must they not be skewering?
Perfect
must I not have skewered? must you not have skewered? must he not have skewered? must we not have skewered? must you not have skewered? must they not have skewered?
V-ing perfect
must I not have been skewering? must you not have been skewering? must he not have been skewering? must we not have been skewering? must you not have been skewering? must they not have been skewering?