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