I could drool you could drool he could drool we could drool you could drool they could drool
V-ing form
I could be drooling you could be drooling he could be drooling we could be drooling you could be drooling they could be drooling
Perfect
I could have drooled you could have drooled he could have drooled we could have drooled you could have drooled they could have drooled
V-ing perfect
I could have been drooling you could have been drooling he could have been drooling we could have been drooling you could have been drooling they could have been drooling
Negation
Simple form
I could not drool you could not drool he could not drool we could not drool you could not drool they could not drool
V-ing form
I could not be drooling you could not be drooling he could not be drooling we could not be drooling you could not be drooling they could not be drooling
Perfect
I could not have drooled you could not have drooled he could not have drooled we could not have drooled you could not have drooled they could not have drooled
V-ing perfect
I could not have been drooling you could not have been drooling he could not have been drooling we could not have been drooling you could not have been drooling they could not have been drooling
Interrogative form
Simple form
could I drool? could you drool? could he drool? could we drool? could you drool? could they drool?
V-ing form
could I be drooling? could you be drooling? could he be drooling? could we be drooling? could you be drooling? could they be drooling?
Perfect
could I have drooled? could you have drooled? could he have drooled? could we have drooled? could you have drooled? could they have drooled?
V-ing perfect
could I have been drooling? could you have been drooling? could he have been drooling? could we have been drooling? could you have been drooling? could they have been drooling?
Interro-negative form
Simple form
could I not drool? could you not drool? could he not drool? could we not drool? could you not drool? could they not drool?
V-ing form
could I not be drooling? could you not be drooling? could he not be drooling? could we not be drooling? could you not be drooling? could they not be drooling?
Perfect
could I not have drooled? could you not have drooled? could he not have drooled? could we not have drooled? could you not have drooled? could they not have drooled?
V-ing perfect
could I not have been drooling? could you not have been drooling? could he not have been drooling? could we not have been drooling? could you not have been drooling? could they not have been drooling?