I could ear you could ear he could ear we could ear you could ear they could ear
V-ing form
I could be earing you could be earing he could be earing we could be earing you could be earing they could be earing
Perfect
I could have eared you could have eared he could have eared we could have eared you could have eared they could have eared
V-ing perfect
I could have been earing you could have been earing he could have been earing we could have been earing you could have been earing they could have been earing
Negation
Simple form
I could not ear you could not ear he could not ear we could not ear you could not ear they could not ear
V-ing form
I could not be earing you could not be earing he could not be earing we could not be earing you could not be earing they could not be earing
Perfect
I could not have eared you could not have eared he could not have eared we could not have eared you could not have eared they could not have eared
V-ing perfect
I could not have been earing you could not have been earing he could not have been earing we could not have been earing you could not have been earing they could not have been earing
Interrogative form
Simple form
could I ear? could you ear? could he ear? could we ear? could you ear? could they ear?
V-ing form
could I be earing? could you be earing? could he be earing? could we be earing? could you be earing? could they be earing?
Perfect
could I have eared? could you have eared? could he have eared? could we have eared? could you have eared? could they have eared?
V-ing perfect
could I have been earing? could you have been earing? could he have been earing? could we have been earing? could you have been earing? could they have been earing?
Interro-negative form
Simple form
could I not ear? could you not ear? could he not ear? could we not ear? could you not ear? could they not ear?
V-ing form
could I not be earing? could you not be earing? could he not be earing? could we not be earing? could you not be earing? could they not be earing?
Perfect
could I not have eared? could you not have eared? could he not have eared? could we not have eared? could you not have eared? could they not have eared?
V-ing perfect
could I not have been earing? could you not have been earing? could he not have been earing? could we not have been earing? could you not have been earing? could they not have been earing?