I could dispute you could dispute he could dispute we could dispute you could dispute they could dispute
V-ing form
I could be disputing you could be disputing he could be disputing we could be disputing you could be disputing they could be disputing
Perfect
I could have disputed you could have disputed he could have disputed we could have disputed you could have disputed they could have disputed
V-ing perfect
I could have been disputing you could have been disputing he could have been disputing we could have been disputing you could have been disputing they could have been disputing
Negation
Simple form
I could not dispute you could not dispute he could not dispute we could not dispute you could not dispute they could not dispute
V-ing form
I could not be disputing you could not be disputing he could not be disputing we could not be disputing you could not be disputing they could not be disputing
Perfect
I could not have disputed you could not have disputed he could not have disputed we could not have disputed you could not have disputed they could not have disputed
V-ing perfect
I could not have been disputing you could not have been disputing he could not have been disputing we could not have been disputing you could not have been disputing they could not have been disputing
Interrogative form
Simple form
could I dispute? could you dispute? could he dispute? could we dispute? could you dispute? could they dispute?
V-ing form
could I be disputing? could you be disputing? could he be disputing? could we be disputing? could you be disputing? could they be disputing?
Perfect
could I have disputed? could you have disputed? could he have disputed? could we have disputed? could you have disputed? could they have disputed?
V-ing perfect
could I have been disputing? could you have been disputing? could he have been disputing? could we have been disputing? could you have been disputing? could they have been disputing?
Interro-negative form
Simple form
could I not dispute? could you not dispute? could he not dispute? could we not dispute? could you not dispute? could they not dispute?
V-ing form
could I not be disputing? could you not be disputing? could he not be disputing? could we not be disputing? could you not be disputing? could they not be disputing?
Perfect
could I not have disputed? could you not have disputed? could he not have disputed? could we not have disputed? could you not have disputed? could they not have disputed?
V-ing perfect
could I not have been disputing? could you not have been disputing? could he not have been disputing? could we not have been disputing? could you not have been disputing? could they not have been disputing?