I must act you must act he must act we must act you must act they must act
V-ing form
I must be acting you must be acting he must be acting we must be acting you must be acting they must be acting
Perfect
I must have acted you must have acted he must have acted we must have acted you must have acted they must have acted
V-ing perfect
I must have been acting you must have been acting he must have been acting we must have been acting you must have been acting they must have been acting
Negation
Simple form
I must not act you must not act he must not act we must not act you must not act they must not act
V-ing form
I must not be acting you must not be acting he must not be acting we must not be acting you must not be acting they must not be acting
Perfect
I must not have acted you must not have acted he must not have acted we must not have acted you must not have acted they must not have acted
V-ing perfect
I must not have been acting you must not have been acting he must not have been acting we must not have been acting you must not have been acting they must not have been acting
Interrogative form
Simple form
must I act? must you act? must he act? must we act? must you act? must they act?
V-ing form
must I be acting? must you be acting? must he be acting? must we be acting? must you be acting? must they be acting?
Perfect
must I have acted? must you have acted? must he have acted? must we have acted? must you have acted? must they have acted?
V-ing perfect
must I have been acting? must you have been acting? must he have been acting? must we have been acting? must you have been acting? must they have been acting?
Interro-negative form
Simple form
must I not act? must you not act? must he not act? must we not act? must you not act? must they not act?
V-ing form
must I not be acting? must you not be acting? must he not be acting? must we not be acting? must you not be acting? must they not be acting?
Perfect
must I not have acted? must you not have acted? must he not have acted? must we not have acted? must you not have acted? must they not have acted?
V-ing perfect
must I not have been acting? must you not have been acting? must he not have been acting? must we not have been acting? must you not have been acting? must they not have been acting?