I could ambush you could ambush he could ambush we could ambush you could ambush they could ambush
V-ing form
I could be ambushing you could be ambushing he could be ambushing we could be ambushing you could be ambushing they could be ambushing
Perfect
I could have ambushed you could have ambushed he could have ambushed we could have ambushed you could have ambushed they could have ambushed
V-ing perfect
I could have been ambushing you could have been ambushing he could have been ambushing we could have been ambushing you could have been ambushing they could have been ambushing
Negation
Simple form
I couldn't ambush you couldn't ambush he couldn't ambush we couldn't ambush you couldn't ambush they couldn't ambush
V-ing form
I couldn't be ambushing you couldn't be ambushing he couldn't be ambushing we couldn't be ambushing you couldn't be ambushing they couldn't be ambushing
Perfect
I couldn't have ambushed you couldn't have ambushed he couldn't have ambushed we couldn't have ambushed you couldn't have ambushed they couldn't have ambushed
V-ing perfect
I couldn't have been ambushing you couldn't have been ambushing he couldn't have been ambushing we couldn't have been ambushing you couldn't have been ambushing they couldn't have been ambushing
Interrogative form
Simple form
could I ambush? could you ambush? could he ambush? could we ambush? could you ambush? could they ambush?
V-ing form
could I be ambushing? could you be ambushing? could he be ambushing? could we be ambushing? could you be ambushing? could they be ambushing?
Perfect
could I have ambushed? could you have ambushed? could he have ambushed? could we have ambushed? could you have ambushed? could they have ambushed?
V-ing perfect
could I have been ambushing? could you have been ambushing? could he have been ambushing? could we have been ambushing? could you have been ambushing? could they have been ambushing?
Interro-negative form
Simple form
couldn't I ambush? couldn't you ambush? couldn't he ambush? couldn't we ambush? couldn't you ambush? couldn't they ambush?
V-ing form
couldn't I be ambushing? couldn't you be ambushing? couldn't he be ambushing? couldn't we be ambushing? couldn't you be ambushing? couldn't they be ambushing?
Perfect
couldn't I have ambushed? couldn't you have ambushed? couldn't he have ambushed? couldn't we have ambushed? couldn't you have ambushed? couldn't they have ambushed?
V-ing perfect
couldn't I have been ambushing? couldn't you have been ambushing? couldn't he have been ambushing? couldn't we have been ambushing? couldn't you have been ambushing? couldn't they have been ambushing?