I must slap you must slap he must slap we must slap you must slap they must slap
V-ing form
I must be slapping you must be slapping he must be slapping we must be slapping you must be slapping they must be slapping
Perfect
I must have slapped you must have slapped he 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 he 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 he 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 he 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 he 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 he 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 he slap? must we slap? must you slap? must they slap?
V-ing form
must I be slapping? must you be slapping? must he be slapping? must we be slapping? must you be slapping? must they be slapping?
Perfect
must I have slapped? must you have slapped? must he 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 he 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 he 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 he 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 he 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 he have been slapping? mustn't we have been slapping? mustn't you have been slapping? mustn't they have been slapping?