I could delay you could delay he could delay we could delay you could delay they could delay
V-ing form
I could be delaying you could be delaying he could be delaying we could be delaying you could be delaying they could be delaying
Perfect
I could have delayed you could have delayed he could have delayed we could have delayed you could have delayed they could have delayed
V-ing perfect
I could have been delaying you could have been delaying he could have been delaying we could have been delaying you could have been delaying they could have been delaying
Negation
Simple form
I could not delay you could not delay he could not delay we could not delay you could not delay they could not delay
V-ing form
I could not be delaying you could not be delaying he could not be delaying we could not be delaying you could not be delaying they could not be delaying
Perfect
I could not have delayed you could not have delayed he could not have delayed we could not have delayed you could not have delayed they could not have delayed
V-ing perfect
I could not have been delaying you could not have been delaying he could not have been delaying we could not have been delaying you could not have been delaying they could not have been delaying
Interrogative form
Simple form
could I delay? could you delay? could he delay? could we delay? could you delay? could they delay?
V-ing form
could I be delaying? could you be delaying? could he be delaying? could we be delaying? could you be delaying? could they be delaying?
Perfect
could I have delayed? could you have delayed? could he have delayed? could we have delayed? could you have delayed? could they have delayed?
V-ing perfect
could I have been delaying? could you have been delaying? could he have been delaying? could we have been delaying? could you have been delaying? could they have been delaying?
Interro-negative form
Simple form
could I not delay? could you not delay? could he not delay? could we not delay? could you not delay? could they not delay?
V-ing form
could I not be delaying? could you not be delaying? could he not be delaying? could we not be delaying? could you not be delaying? could they not be delaying?
Perfect
could I not have delayed? could you not have delayed? could he not have delayed? could we not have delayed? could you not have delayed? could they not have delayed?
V-ing perfect
could I not have been delaying? could you not have been delaying? could he not have been delaying? could we not have been delaying? could you not have been delaying? could they not have been delaying?