I could edit you could edit he could edit we could edit you could edit they could edit
V-ing form
I could be editing you could be editing he could be editing we could be editing you could be editing they could be editing
Perfect
I could have edited you could have edited he could have edited we could have edited you could have edited they could have edited
V-ing perfect
I could have been editing you could have been editing he could have been editing we could have been editing you could have been editing they could have been editing
Negation
Simple form
I could not edit you could not edit he could not edit we could not edit you could not edit they could not edit
V-ing form
I could not be editing you could not be editing he could not be editing we could not be editing you could not be editing they could not be editing
Perfect
I could not have edited you could not have edited he could not have edited we could not have edited you could not have edited they could not have edited
V-ing perfect
I could not have been editing you could not have been editing he could not have been editing we could not have been editing you could not have been editing they could not have been editing
Interrogative form
Simple form
could I edit? could you edit? could he edit? could we edit? could you edit? could they edit?
V-ing form
could I be editing? could you be editing? could he be editing? could we be editing? could you be editing? could they be editing?
Perfect
could I have edited? could you have edited? could he have edited? could we have edited? could you have edited? could they have edited?
V-ing perfect
could I have been editing? could you have been editing? could he have been editing? could we have been editing? could you have been editing? could they have been editing?
Interro-negative form
Simple form
could I not edit? could you not edit? could he not edit? could we not edit? could you not edit? could they not edit?
V-ing form
could I not be editing? could you not be editing? could he not be editing? could we not be editing? could you not be editing? could they not be editing?
Perfect
could I not have edited? could you not have edited? could he not have edited? could we not have edited? could you not have edited? could they not have edited?
V-ing perfect
could I not have been editing? could you not have been editing? could he not have been editing? could we not have been editing? could you not have been editing? could they not have been editing?