I must slenderise you must slenderise he must slenderise we must slenderise you must slenderise they must slenderise
V-ing form
I must be slenderising you must be slenderising he must be slenderising we must be slenderising you must be slenderising they must be slenderising
Perfect
I must have slenderised you must have slenderised he must have slenderised we must have slenderised you must have slenderised they must have slenderised
V-ing perfect
I must have been slenderising you must have been slenderising he must have been slenderising we must have been slenderising you must have been slenderising they must have been slenderising
Negation
Simple form
I mustn't slenderise you mustn't slenderise he mustn't slenderise we mustn't slenderise you mustn't slenderise they mustn't slenderise
V-ing form
I mustn't be slenderising you mustn't be slenderising he mustn't be slenderising we mustn't be slenderising you mustn't be slenderising they mustn't be slenderising
Perfect
I mustn't have slenderised you mustn't have slenderised he mustn't have slenderised we mustn't have slenderised you mustn't have slenderised they mustn't have slenderised
V-ing perfect
I mustn't have been slenderising you mustn't have been slenderising he mustn't have been slenderising we mustn't have been slenderising you mustn't have been slenderising they mustn't have been slenderising
Interrogative form
Simple form
must I slenderise? must you slenderise? must he slenderise? must we slenderise? must you slenderise? must they slenderise?
V-ing form
must I be slenderising? must you be slenderising? must he be slenderising? must we be slenderising? must you be slenderising? must they be slenderising?
Perfect
must I have slenderised? must you have slenderised? must he have slenderised? must we have slenderised? must you have slenderised? must they have slenderised?
V-ing perfect
must I have been slenderising? must you have been slenderising? must he have been slenderising? must we have been slenderising? must you have been slenderising? must they have been slenderising?
Interro-negative form
Simple form
mustn't I slenderise? mustn't you slenderise? mustn't he slenderise? mustn't we slenderise? mustn't you slenderise? mustn't they slenderise?
V-ing form
mustn't I be slenderising? mustn't you be slenderising? mustn't he be slenderising? mustn't we be slenderising? mustn't you be slenderising? mustn't they be slenderising?
Perfect
mustn't I have slenderised? mustn't you have slenderised? mustn't he have slenderised? mustn't we have slenderised? mustn't you have slenderised? mustn't they have slenderised?
V-ing perfect
mustn't I have been slenderising? mustn't you have been slenderising? mustn't he have been slenderising? mustn't we have been slenderising? mustn't you have been slenderising? mustn't they have been slenderising?