I could brick you could brick he could brick we could brick you could brick they could brick
V-ing form
I could be bricking you could be bricking he could be bricking we could be bricking you could be bricking they could be bricking
Perfect
I could have bricked you could have bricked he could have bricked we could have bricked you could have bricked they could have bricked
V-ing perfect
I could have been bricking you could have been bricking he could have been bricking we could have been bricking you could have been bricking they could have been bricking
Negation
Simple form
I could not brick you could not brick he could not brick we could not brick you could not brick they could not brick
V-ing form
I could not be bricking you could not be bricking he could not be bricking we could not be bricking you could not be bricking they could not be bricking
Perfect
I could not have bricked you could not have bricked he could not have bricked we could not have bricked you could not have bricked they could not have bricked
V-ing perfect
I could not have been bricking you could not have been bricking he could not have been bricking we could not have been bricking you could not have been bricking they could not have been bricking
Interrogative form
Simple form
could I brick? could you brick? could he brick? could we brick? could you brick? could they brick?
V-ing form
could I be bricking? could you be bricking? could he be bricking? could we be bricking? could you be bricking? could they be bricking?
Perfect
could I have bricked? could you have bricked? could he have bricked? could we have bricked? could you have bricked? could they have bricked?
V-ing perfect
could I have been bricking? could you have been bricking? could he have been bricking? could we have been bricking? could you have been bricking? could they have been bricking?
Interro-negative form
Simple form
could I not brick? could you not brick? could he not brick? could we not brick? could you not brick? could they not brick?
V-ing form
could I not be bricking? could you not be bricking? could he not be bricking? could we not be bricking? could you not be bricking? could they not be bricking?
Perfect
could I not have bricked? could you not have bricked? could he not have bricked? could we not have bricked? could you not have bricked? could they not have bricked?
V-ing perfect
could I not have been bricking? could you not have been bricking? could he not have been bricking? could we not have been bricking? could you not have been bricking? could they not have been bricking?