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