I could differ you could differ she could differ we could differ you could differ they could differ
V-ing form
I could be differing you could be differing she could be differing we could be differing you could be differing they could be differing
Perfect
I could have differed you could have differed she could have differed we could have differed you could have differed they could have differed
V-ing perfect
I could have been differing you could have been differing she could have been differing we could have been differing you could have been differing they could have been differing
Negation
Simple form
I could not differ you could not differ she could not differ we could not differ you could not differ they could not differ
V-ing form
I could not be differing you could not be differing she could not be differing we could not be differing you could not be differing they could not be differing
Perfect
I could not have differed you could not have differed she could not have differed we could not have differed you could not have differed they could not have differed
V-ing perfect
I could not have been differing you could not have been differing she could not have been differing we could not have been differing you could not have been differing they could not have been differing
Interrogative form
Simple form
could I differ? could you differ? could she differ? could we differ? could you differ? could they differ?
V-ing form
could I be differing? could you be differing? could she be differing? could we be differing? could you be differing? could they be differing?
Perfect
could I have differed? could you have differed? could she have differed? could we have differed? could you have differed? could they have differed?
V-ing perfect
could I have been differing? could you have been differing? could she have been differing? could we have been differing? could you have been differing? could they have been differing?
Interro-negative form
Simple form
could I not differ? could you not differ? could she not differ? could we not differ? could you not differ? could they not differ?
V-ing form
could I not be differing? could you not be differing? could she not be differing? could we not be differing? could you not be differing? could they not be differing?
Perfect
could I not have differed? could you not have differed? could she not have differed? could we not have differed? could you not have differed? could they not have differed?
V-ing perfect
could I not have been differing? could you not have been differing? could she not have been differing? could we not have been differing? could you not have been differing? could they not have been differing?