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 mustn't whack you mustn't whack he mustn't whack we mustn't whack you mustn't whack they mustn't whack
V-ing form
I mustn't be whacking you mustn't be whacking he mustn't be whacking we mustn't be whacking you mustn't be whacking they mustn't be whacking
Perfect
I mustn't have whacked you mustn't have whacked he mustn't have whacked we mustn't have whacked you mustn't have whacked they mustn't have whacked
V-ing perfect
I mustn't have been whacking you mustn't have been whacking he mustn't have been whacking we mustn't have been whacking you mustn't have been whacking they mustn't 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
mustn't I whack? mustn't you whack? mustn't he whack? mustn't we whack? mustn't you whack? mustn't they whack?
V-ing form
mustn't I be whacking? mustn't you be whacking? mustn't he be whacking? mustn't we be whacking? mustn't you be whacking? mustn't they be whacking?
Perfect
mustn't I have whacked? mustn't you have whacked? mustn't he have whacked? mustn't we have whacked? mustn't you have whacked? mustn't they have whacked?
V-ing perfect
mustn't I have been whacking? mustn't you have been whacking? mustn't he have been whacking? mustn't we have been whacking? mustn't you have been whacking? mustn't they have been whacking?