I must whack you must whack he must whack we must whack you must whack they must whack
V-ing form
I must be whacking you must be whacking he must be whacking we must be whacking you must be whacking they must be whacking
Perfect
I must have whacked you must have whacked he must have whacked we must have whacked you must have whacked they must have whacked
V-ing perfect
I must have been whacking you must have been whacking he must have been whacking we must have been whacking you must have been whacking they must have been whacking
Negation
Simple form
I must not whack you must not whack he must not whack we must not whack you must not whack they must not whack
V-ing form
I must not be whacking you must not be whacking he must not be whacking we must not be whacking you must not be whacking they must not be whacking
Perfect
I must not have whacked you must not have whacked he must not have whacked we must not have whacked you must not have whacked they must not have whacked
V-ing perfect
I must not have been whacking you must not have been whacking he must not have been whacking we must not have been whacking you must not have been whacking they must not have been whacking
Interrogative form
Simple form
must I whack? must you whack? must he whack? must we whack? must you whack? must they whack?
V-ing form
must I be whacking? must you be whacking? must he be whacking? must we be whacking? must you be whacking? must they be whacking?
Perfect
must I have whacked? must you have whacked? must he have whacked? must we have whacked? must you have whacked? must they have whacked?
V-ing perfect
must I have been whacking? must you have been whacking? must he have been whacking? must we have been whacking? must you have been whacking? must they have been whacking?
Interro-negative form
Simple form
must I not whack? must you not whack? must he not whack? must we not whack? must you not whack? must they not whack?
V-ing form
must I not be whacking? must you not be whacking? must he not be whacking? must we not be whacking? must you not be whacking? must they not be whacking?
Perfect
must I not have whacked? must you not have whacked? must he not have whacked? must we not have whacked? must you not have whacked? must they not have whacked?
V-ing perfect
must I not have been whacking? must you not have been whacking? must he not have been whacking? must we not have been whacking? must you not have been whacking? must they not have been whacking?