I could appeal you could appeal she could appeal we could appeal you could appeal they could appeal
V-ing form
I could be appealing you could be appealing she could be appealing we could be appealing you could be appealing they could be appealing
Perfect
I could have appealed you could have appealed she could have appealed we could have appealed you could have appealed they could have appealed
V-ing perfect
I could have been appealing you could have been appealing she could have been appealing we could have been appealing you could have been appealing they could have been appealing
Negation
Simple form
I could not appeal you could not appeal she could not appeal we could not appeal you could not appeal they could not appeal
V-ing form
I could not be appealing you could not be appealing she could not be appealing we could not be appealing you could not be appealing they could not be appealing
Perfect
I could not have appealed you could not have appealed she could not have appealed we could not have appealed you could not have appealed they could not have appealed
V-ing perfect
I could not have been appealing you could not have been appealing she could not have been appealing we could not have been appealing you could not have been appealing they could not have been appealing
Interrogative form
Simple form
could I appeal? could you appeal? could she appeal? could we appeal? could you appeal? could they appeal?
V-ing form
could I be appealing? could you be appealing? could she be appealing? could we be appealing? could you be appealing? could they be appealing?
Perfect
could I have appealed? could you have appealed? could she have appealed? could we have appealed? could you have appealed? could they have appealed?
V-ing perfect
could I have been appealing? could you have been appealing? could she have been appealing? could we have been appealing? could you have been appealing? could they have been appealing?
Interro-negative form
Simple form
could I not appeal? could you not appeal? could she not appeal? could we not appeal? could you not appeal? could they not appeal?
V-ing form
could I not be appealing? could you not be appealing? could she not be appealing? could we not be appealing? could you not be appealing? could they not be appealing?
Perfect
could I not have appealed? could you not have appealed? could she not have appealed? could we not have appealed? could you not have appealed? could they not have appealed?
V-ing perfect
could I not have been appealing? could you not have been appealing? could she not have been appealing? could we not have been appealing? could you not have been appealing? could they not have been appealing?