I must slap you must slap she must slap we must slap you must slap they must slap
V-ing form
I must be slapping you must be slapping she must be slapping we must be slapping you must be slapping they must be slapping
Perfect
I must have slapped you must have slapped she must have slapped we must have slapped you must have slapped they must have slapped
V-ing perfect
I must have been slapping you must have been slapping she must have been slapping we must have been slapping you must have been slapping they must have been slapping
Negation
Simple form
I mustn't slap you mustn't slap she mustn't slap we mustn't slap you mustn't slap they mustn't slap
V-ing form
I mustn't be slapping you mustn't be slapping she mustn't be slapping we mustn't be slapping you mustn't be slapping they mustn't be slapping
Perfect
I mustn't have slapped you mustn't have slapped she mustn't have slapped we mustn't have slapped you mustn't have slapped they mustn't have slapped
V-ing perfect
I mustn't have been slapping you mustn't have been slapping she mustn't have been slapping we mustn't have been slapping you mustn't have been slapping they mustn't have been slapping
Interrogative form
Simple form
must I slap? must you slap? must she slap? must we slap? must you slap? must they slap?
V-ing form
must I be slapping? must you be slapping? must she be slapping? must we be slapping? must you be slapping? must they be slapping?
Perfect
must I have slapped? must you have slapped? must she have slapped? must we have slapped? must you have slapped? must they have slapped?
V-ing perfect
must I have been slapping? must you have been slapping? must she have been slapping? must we have been slapping? must you have been slapping? must they have been slapping?
Interro-negative form
Simple form
mustn't I slap? mustn't you slap? mustn't she slap? mustn't we slap? mustn't you slap? mustn't they slap?
V-ing form
mustn't I be slapping? mustn't you be slapping? mustn't she be slapping? mustn't we be slapping? mustn't you be slapping? mustn't they be slapping?
Perfect
mustn't I have slapped? mustn't you have slapped? mustn't she have slapped? mustn't we have slapped? mustn't you have slapped? mustn't they have slapped?
V-ing perfect
mustn't I have been slapping? mustn't you have been slapping? mustn't she have been slapping? mustn't we have been slapping? mustn't you have been slapping? mustn't they have been slapping?