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