I could empty you could empty she could empty we could empty you could empty they could empty
V-ing form
I could be emptying you could be emptying she could be emptying we could be emptying you could be emptying they could be emptying
Perfect
I could have emptied you could have emptied she could have emptied we could have emptied you could have emptied they could have emptied
V-ing perfect
I could have been emptying you could have been emptying she could have been emptying we could have been emptying you could have been emptying they could have been emptying
Negation
Simple form
I couldn't empty you couldn't empty she couldn't empty we couldn't empty you couldn't empty they couldn't empty
V-ing form
I couldn't be emptying you couldn't be emptying she couldn't be emptying we couldn't be emptying you couldn't be emptying they couldn't be emptying
Perfect
I couldn't have emptied you couldn't have emptied she couldn't have emptied we couldn't have emptied you couldn't have emptied they couldn't have emptied
V-ing perfect
I couldn't have been emptying you couldn't have been emptying she couldn't have been emptying we couldn't have been emptying you couldn't have been emptying they couldn't have been emptying
Interrogative form
Simple form
could I empty? could you empty? could she empty? could we empty? could you empty? could they empty?
V-ing form
could I be emptying? could you be emptying? could she be emptying? could we be emptying? could you be emptying? could they be emptying?
Perfect
could I have emptied? could you have emptied? could she have emptied? could we have emptied? could you have emptied? could they have emptied?
V-ing perfect
could I have been emptying? could you have been emptying? could she have been emptying? could we have been emptying? could you have been emptying? could they have been emptying?
Interro-negative form
Simple form
couldn't I empty? couldn't you empty? couldn't she empty? couldn't we empty? couldn't you empty? couldn't they empty?
V-ing form
couldn't I be emptying? couldn't you be emptying? couldn't she be emptying? couldn't we be emptying? couldn't you be emptying? couldn't they be emptying?
Perfect
couldn't I have emptied? couldn't you have emptied? couldn't she have emptied? couldn't we have emptied? couldn't you have emptied? couldn't they have emptied?
V-ing perfect
couldn't I have been emptying? couldn't you have been emptying? couldn't she have been emptying? couldn't we have been emptying? couldn't you have been emptying? couldn't they have been emptying?