I could deprave you could deprave he could deprave we could deprave you could deprave they could deprave
V-ing form
I could be depraving you could be depraving he could be depraving we could be depraving you could be depraving they could be depraving
Perfect
I could have depraved you could have depraved he 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 he 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 he 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 he 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 he 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 he 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 he deprave? could we deprave? could you deprave? could they deprave?
V-ing form
could I be depraving? could you be depraving? could he be depraving? could we be depraving? could you be depraving? could they be depraving?
Perfect
could I have depraved? could you have depraved? could he 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 he 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 he 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 he 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 he 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 he have been depraving? couldn't we have been depraving? couldn't you have been depraving? couldn't they have been depraving?