I could paddle you could paddle he could paddle we could paddle you could paddle they could paddle
V-ing form
I could be paddling you could be paddling he could be paddling we could be paddling you could be paddling they could be paddling
Perfect
I could have paddled you could have paddled he 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 he could have been paddling we could have been paddling you could have been paddling they could have been paddling
Negation
Simple form
I couldn't paddle you couldn't paddle he couldn't paddle we couldn't paddle you couldn't paddle they couldn't paddle
V-ing form
I couldn't be paddling you couldn't be paddling he couldn't be paddling we couldn't be paddling you couldn't be paddling they couldn't be paddling
Perfect
I couldn't have paddled you couldn't have paddled he couldn't have paddled we couldn't have paddled you couldn't have paddled they couldn't have paddled
V-ing perfect
I couldn't have been paddling you couldn't have been paddling he couldn't have been paddling we couldn't have been paddling you couldn't have been paddling they couldn't have been paddling
Interrogative form
Simple form
could I paddle? could you paddle? could he paddle? could we paddle? could you paddle? could they paddle?
V-ing form
could I be paddling? could you be paddling? could he be paddling? could we be paddling? could you be paddling? could they be paddling?
Perfect
could I have paddled? could you have paddled? could he 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 he have been paddling? could we have been paddling? could you have been paddling? could they have been paddling?
Interro-negative form
Simple form
couldn't I paddle? couldn't you paddle? couldn't he paddle? couldn't we paddle? couldn't you paddle? couldn't they paddle?
V-ing form
couldn't I be paddling? couldn't you be paddling? couldn't he be paddling? couldn't we be paddling? couldn't you be paddling? couldn't they be paddling?
Perfect
couldn't I have paddled? couldn't you have paddled? couldn't he have paddled? couldn't we have paddled? couldn't you have paddled? couldn't they have paddled?
V-ing perfect
couldn't I have been paddling? couldn't you have been paddling? couldn't he have been paddling? couldn't we have been paddling? couldn't you have been paddling? couldn't they have been paddling?