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