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