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