I could paddle you could paddle she could paddle we could paddle you could paddle they could paddle
V-ing form
I could be paddling you could be paddling she could be paddling we could be paddling you could be paddling they could be paddling
Perfect
I could have paddled you could have paddled she could have paddled we could have paddled you could have paddled they could have paddled
V-ing perfect
I could have been paddling you could have been paddling she could have been paddling we could have been paddling you could have been paddling they could have been paddling
Negation
Simple form
I could not paddle you could not paddle she could not paddle we could not paddle you could not paddle they could not paddle
V-ing form
I could not be paddling you could not be paddling she could not be paddling we could not be paddling you could not be paddling they could not be paddling
Perfect
I could not have paddled you could not have paddled she could not have paddled we could not have paddled you could not have paddled they could not have paddled
V-ing perfect
I could not have been paddling you could not have been paddling she could not have been paddling we could not have been paddling you could not have been paddling they could not have been paddling
Interrogative form
Simple form
could I paddle? could you paddle? could she paddle? could we paddle? could you paddle? could they paddle?
V-ing form
could I be paddling? could you be paddling? could she be paddling? could we be paddling? could you be paddling? could they be paddling?
Perfect
could I have paddled? could you have paddled? could she have paddled? could we have paddled? could you have paddled? could they have paddled?
V-ing perfect
could I have been paddling? could you have been paddling? could she have been paddling? could we have been paddling? could you have been paddling? could they have been paddling?
Interro-negative form
Simple form
could I not paddle? could you not paddle? could she not paddle? could we not paddle? could you not paddle? could they not paddle?
V-ing form
could I not be paddling? could you not be paddling? could she not be paddling? could we not be paddling? could you not be paddling? could they not be paddling?
Perfect
could I not have paddled? could you not have paddled? could she not have paddled? could we not have paddled? could you not have paddled? could they not have paddled?
V-ing perfect
could I not have been paddling? could you not have been paddling? could she not have been paddling? could we not have been paddling? could you not have been paddling? could they not have been paddling?