I must countermand you must countermand she must countermand we must countermand you must countermand they must countermand
V-ing form
I must be countermanding you must be countermanding she must be countermanding we must be countermanding you must be countermanding they must be countermanding
Perfect
I must have countermanded you must have countermanded she must have countermanded we must have countermanded you must have countermanded they must have countermanded
V-ing perfect
I must have been countermanding you must have been countermanding she must have been countermanding we must have been countermanding you must have been countermanding they must have been countermanding
Negation
Simple form
I must not countermand you must not countermand she must not countermand we must not countermand you must not countermand they must not countermand
V-ing form
I must not be countermanding you must not be countermanding she must not be countermanding we must not be countermanding you must not be countermanding they must not be countermanding
Perfect
I must not have countermanded you must not have countermanded she must not have countermanded we must not have countermanded you must not have countermanded they must not have countermanded
V-ing perfect
I must not have been countermanding you must not have been countermanding she must not have been countermanding we must not have been countermanding you must not have been countermanding they must not have been countermanding
Interrogative form
Simple form
must I countermand? must you countermand? must she countermand? must we countermand? must you countermand? must they countermand?
V-ing form
must I be countermanding? must you be countermanding? must she be countermanding? must we be countermanding? must you be countermanding? must they be countermanding?
Perfect
must I have countermanded? must you have countermanded? must she have countermanded? must we have countermanded? must you have countermanded? must they have countermanded?
V-ing perfect
must I have been countermanding? must you have been countermanding? must she have been countermanding? must we have been countermanding? must you have been countermanding? must they have been countermanding?
Interro-negative form
Simple form
must I not countermand? must you not countermand? must she not countermand? must we not countermand? must you not countermand? must they not countermand?
V-ing form
must I not be countermanding? must you not be countermanding? must she not be countermanding? must we not be countermanding? must you not be countermanding? must they not be countermanding?
Perfect
must I not have countermanded? must you not have countermanded? must she not have countermanded? must we not have countermanded? must you not have countermanded? must they not have countermanded?
V-ing perfect
must I not have been countermanding? must you not have been countermanding? must she not have been countermanding? must we not have been countermanding? must you not have been countermanding? must they not have been countermanding?