I could bush you could bush she could bush we could bush you could bush they could bush
V-ing form
I could be bushing you could be bushing she could be bushing we could be bushing you could be bushing they could be bushing
Perfect
I could have bushed you could have bushed she could have bushed we could have bushed you could have bushed they could have bushed
V-ing perfect
I could have been bushing you could have been bushing she could have been bushing we could have been bushing you could have been bushing they could have been bushing
Negation
Simple form
I could not bush you could not bush she could not bush we could not bush you could not bush they could not bush
V-ing form
I could not be bushing you could not be bushing she could not be bushing we could not be bushing you could not be bushing they could not be bushing
Perfect
I could not have bushed you could not have bushed she could not have bushed we could not have bushed you could not have bushed they could not have bushed
V-ing perfect
I could not have been bushing you could not have been bushing she could not have been bushing we could not have been bushing you could not have been bushing they could not have been bushing
Interrogative form
Simple form
could I bush? could you bush? could she bush? could we bush? could you bush? could they bush?
V-ing form
could I be bushing? could you be bushing? could she be bushing? could we be bushing? could you be bushing? could they be bushing?
Perfect
could I have bushed? could you have bushed? could she have bushed? could we have bushed? could you have bushed? could they have bushed?
V-ing perfect
could I have been bushing? could you have been bushing? could she have been bushing? could we have been bushing? could you have been bushing? could they have been bushing?
Interro-negative form
Simple form
could I not bush? could you not bush? could she not bush? could we not bush? could you not bush? could they not bush?
V-ing form
could I not be bushing? could you not be bushing? could she not be bushing? could we not be bushing? could you not be bushing? could they not be bushing?
Perfect
could I not have bushed? could you not have bushed? could she not have bushed? could we not have bushed? could you not have bushed? could they not have bushed?
V-ing perfect
could I not have been bushing? could you not have been bushing? could she not have been bushing? could we not have been bushing? could you not have been bushing? could they not have been bushing?