I could pave you could pave she could pave we could pave you could pave they could pave
V-ing form
I could be paving you could be paving she could be paving we could be paving you could be paving they could be paving
Perfect
I could have paved you could have paved she could have paved we could have paved you could have paved they could have paved
V-ing perfect
I could have been paving you could have been paving she could have been paving we could have been paving you could have been paving they could have been paving
Negation
Simple form
I could not pave you could not pave she could not pave we could not pave you could not pave they could not pave
V-ing form
I could not be paving you could not be paving she could not be paving we could not be paving you could not be paving they could not be paving
Perfect
I could not have paved you could not have paved she could not have paved we could not have paved you could not have paved they could not have paved
V-ing perfect
I could not have been paving you could not have been paving she could not have been paving we could not have been paving you could not have been paving they could not have been paving
Interrogative form
Simple form
could I pave? could you pave? could she pave? could we pave? could you pave? could they pave?
V-ing form
could I be paving? could you be paving? could she be paving? could we be paving? could you be paving? could they be paving?
Perfect
could I have paved? could you have paved? could she have paved? could we have paved? could you have paved? could they have paved?
V-ing perfect
could I have been paving? could you have been paving? could she have been paving? could we have been paving? could you have been paving? could they have been paving?
Interro-negative form
Simple form
could I not pave? could you not pave? could she not pave? could we not pave? could you not pave? could they not pave?
V-ing form
could I not be paving? could you not be paving? could she not be paving? could we not be paving? could you not be paving? could they not be paving?
Perfect
could I not have paved? could you not have paved? could she not have paved? could we not have paved? could you not have paved? could they not have paved?
V-ing perfect
could I not have been paving? could you not have been paving? could she not have been paving? could we not have been paving? could you not have been paving? could they not have been paving?