I could ride you could ride she could ride we could ride you could ride they could ride
V-ing form
I could be riding you could be riding she could be riding we could be riding you could be riding they could be riding
Perfect
I could have ridden you could have ridden she could have ridden we could have ridden you could have ridden they could have ridden
V-ing perfect
I could have been riding you could have been riding she could have been riding we could have been riding you could have been riding they could have been riding
Negation
Simple form
I could not ride you could not ride she could not ride we could not ride you could not ride they could not ride
V-ing form
I could not be riding you could not be riding she could not be riding we could not be riding you could not be riding they could not be riding
Perfect
I could not have ridden you could not have ridden she could not have ridden we could not have ridden you could not have ridden they could not have ridden
V-ing perfect
I could not have been riding you could not have been riding she could not have been riding we could not have been riding you could not have been riding they could not have been riding
Interrogative form
Simple form
could I ride? could you ride? could she ride? could we ride? could you ride? could they ride?
V-ing form
could I be riding? could you be riding? could she be riding? could we be riding? could you be riding? could they be riding?
Perfect
could I have ridden? could you have ridden? could she have ridden? could we have ridden? could you have ridden? could they have ridden?
V-ing perfect
could I have been riding? could you have been riding? could she have been riding? could we have been riding? could you have been riding? could they have been riding?
Interro-negative form
Simple form
could I not ride? could you not ride? could she not ride? could we not ride? could you not ride? could they not ride?
V-ing form
could I not be riding? could you not be riding? could she not be riding? could we not be riding? could you not be riding? could they not be riding?
Perfect
could I not have ridden? could you not have ridden? could she not have ridden? could we not have ridden? could you not have ridden? could they not have ridden?
V-ing perfect
could I not have been riding? could you not have been riding? could she not have been riding? could we not have been riding? could you not have been riding? could they not have been riding?