I could cool you could cool he could cool we could cool you could cool they could cool
V-ing form
I could be cooling you could be cooling he could be cooling we could be cooling you could be cooling they could be cooling
Perfect
I could have cooled you could have cooled he could have cooled we could have cooled you could have cooled they could have cooled
V-ing perfect
I could have been cooling you could have been cooling he could have been cooling we could have been cooling you could have been cooling they could have been cooling
Negation
Simple form
I could not cool you could not cool he could not cool we could not cool you could not cool they could not cool
V-ing form
I could not be cooling you could not be cooling he could not be cooling we could not be cooling you could not be cooling they could not be cooling
Perfect
I could not have cooled you could not have cooled he could not have cooled we could not have cooled you could not have cooled they could not have cooled
V-ing perfect
I could not have been cooling you could not have been cooling he could not have been cooling we could not have been cooling you could not have been cooling they could not have been cooling
Interrogative form
Simple form
could I cool? could you cool? could he cool? could we cool? could you cool? could they cool?
V-ing form
could I be cooling? could you be cooling? could he be cooling? could we be cooling? could you be cooling? could they be cooling?
Perfect
could I have cooled? could you have cooled? could he have cooled? could we have cooled? could you have cooled? could they have cooled?
V-ing perfect
could I have been cooling? could you have been cooling? could he have been cooling? could we have been cooling? could you have been cooling? could they have been cooling?
Interro-negative form
Simple form
could I not cool? could you not cool? could he not cool? could we not cool? could you not cool? could they not cool?
V-ing form
could I not be cooling? could you not be cooling? could he not be cooling? could we not be cooling? could you not be cooling? could they not be cooling?
Perfect
could I not have cooled? could you not have cooled? could he not have cooled? could we not have cooled? could you not have cooled? could they not have cooled?
V-ing perfect
could I not have been cooling? could you not have been cooling? could he not have been cooling? could we not have been cooling? could you not have been cooling? could they not have been cooling?