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