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 couldn't drool you couldn't drool he couldn't drool we couldn't drool you couldn't drool they couldn't drool
V-ing form
I couldn't be drooling you couldn't be drooling he couldn't be drooling we couldn't be drooling you couldn't be drooling they couldn't be drooling
Perfect
I couldn't have drooled you couldn't have drooled he couldn't have drooled we couldn't have drooled you couldn't have drooled they couldn't have drooled
V-ing perfect
I couldn't have been drooling you couldn't have been drooling he couldn't have been drooling we couldn't have been drooling you couldn't have been drooling they couldn't 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
couldn't I drool? couldn't you drool? couldn't he drool? couldn't we drool? couldn't you drool? couldn't they drool?
V-ing form
couldn't I be drooling? couldn't you be drooling? couldn't he be drooling? couldn't we be drooling? couldn't you be drooling? couldn't they be drooling?
Perfect
couldn't I have drooled? couldn't you have drooled? couldn't he have drooled? couldn't we have drooled? couldn't you have drooled? couldn't they have drooled?
V-ing perfect
couldn't I have been drooling? couldn't you have been drooling? couldn't he have been drooling? couldn't we have been drooling? couldn't you have been drooling? couldn't they have been drooling?