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 couldn't ride you couldn't ride she couldn't ride we couldn't ride you couldn't ride they couldn't ride
V-ing form
I couldn't be riding you couldn't be riding she couldn't be riding we couldn't be riding you couldn't be riding they couldn't be riding
Perfect
I couldn't have ridden you couldn't have ridden she couldn't have ridden we couldn't have ridden you couldn't have ridden they couldn't have ridden
V-ing perfect
I couldn't have been riding you couldn't have been riding she couldn't have been riding we couldn't have been riding you couldn't have been riding they couldn't 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
couldn't I ride? couldn't you ride? couldn't she ride? couldn't we ride? couldn't you ride? couldn't they ride?
V-ing form
couldn't I be riding? couldn't you be riding? couldn't she be riding? couldn't we be riding? couldn't you be riding? couldn't they be riding?
Perfect
couldn't I have ridden? couldn't you have ridden? couldn't she have ridden? couldn't we have ridden? couldn't you have ridden? couldn't they have ridden?
V-ing perfect
couldn't I have been riding? couldn't you have been riding? couldn't she have been riding? couldn't we have been riding? couldn't you have been riding? couldn't they have been riding?