I could loo you could loo he could loo we could loo you could loo they could loo
V-ing form
I could be looing you could be looing he could be looing we could be looing you could be looing they could be looing
Perfect
I could have looed you could have looed he could have looed we could have looed you could have looed they could have looed
V-ing perfect
I could have been looing you could have been looing he could have been looing we could have been looing you could have been looing they could have been looing
Negation
Simple form
I could not loo you could not loo he could not loo we could not loo you could not loo they could not loo
V-ing form
I could not be looing you could not be looing he could not be looing we could not be looing you could not be looing they could not be looing
Perfect
I could not have looed you could not have looed he could not have looed we could not have looed you could not have looed they could not have looed
V-ing perfect
I could not have been looing you could not have been looing he could not have been looing we could not have been looing you could not have been looing they could not have been looing
Interrogative form
Simple form
could I loo? could you loo? could he loo? could we loo? could you loo? could they loo?
V-ing form
could I be looing? could you be looing? could he be looing? could we be looing? could you be looing? could they be looing?
Perfect
could I have looed? could you have looed? could he have looed? could we have looed? could you have looed? could they have looed?
V-ing perfect
could I have been looing? could you have been looing? could he have been looing? could we have been looing? could you have been looing? could they have been looing?
Interro-negative form
Simple form
could I not loo? could you not loo? could he not loo? could we not loo? could you not loo? could they not loo?
V-ing form
could I not be looing? could you not be looing? could he not be looing? could we not be looing? could you not be looing? could they not be looing?
Perfect
could I not have looed? could you not have looed? could he not have looed? could we not have looed? could you not have looed? could they not have looed?
V-ing perfect
could I not have been looing? could you not have been looing? could he not have been looing? could we not have been looing? could you not have been looing? could they not have been looing?