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 couldn't bush you couldn't bush she couldn't bush we couldn't bush you couldn't bush they couldn't bush
V-ing form
I couldn't be bushing you couldn't be bushing she couldn't be bushing we couldn't be bushing you couldn't be bushing they couldn't be bushing
Perfect
I couldn't have bushed you couldn't have bushed she couldn't have bushed we couldn't have bushed you couldn't have bushed they couldn't have bushed
V-ing perfect
I couldn't have been bushing you couldn't have been bushing she couldn't have been bushing we couldn't have been bushing you couldn't have been bushing they couldn't 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
couldn't I bush? couldn't you bush? couldn't she bush? couldn't we bush? couldn't you bush? couldn't they bush?
V-ing form
couldn't I be bushing? couldn't you be bushing? couldn't she be bushing? couldn't we be bushing? couldn't you be bushing? couldn't they be bushing?
Perfect
couldn't I have bushed? couldn't you have bushed? couldn't she have bushed? couldn't we have bushed? couldn't you have bushed? couldn't they have bushed?
V-ing perfect
couldn't I have been bushing? couldn't you have been bushing? couldn't she have been bushing? couldn't we have been bushing? couldn't you have been bushing? couldn't they have been bushing?