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