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