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