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