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