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