I could rebook you could rebook he could rebook we could rebook you could rebook they could rebook
V-ing form
I could be rebooking you could be rebooking he could be rebooking we could be rebooking you could be rebooking they could be rebooking
Perfect
I could have rebooked you could have rebooked he could have rebooked we could have rebooked you could have rebooked they could have rebooked
V-ing perfect
I could have been rebooking you could have been rebooking he could have been rebooking we could have been rebooking you could have been rebooking they could have been rebooking
Negation
Simple form
I could not rebook you could not rebook he could not rebook we could not rebook you could not rebook they could not rebook
V-ing form
I could not be rebooking you could not be rebooking he could not be rebooking we could not be rebooking you could not be rebooking they could not be rebooking
Perfect
I could not have rebooked you could not have rebooked he could not have rebooked we could not have rebooked you could not have rebooked they could not have rebooked
V-ing perfect
I could not have been rebooking you could not have been rebooking he could not have been rebooking we could not have been rebooking you could not have been rebooking they could not have been rebooking
Interrogative form
Simple form
could I rebook? could you rebook? could he rebook? could we rebook? could you rebook? could they rebook?
V-ing form
could I be rebooking? could you be rebooking? could he be rebooking? could we be rebooking? could you be rebooking? could they be rebooking?
Perfect
could I have rebooked? could you have rebooked? could he have rebooked? could we have rebooked? could you have rebooked? could they have rebooked?
V-ing perfect
could I have been rebooking? could you have been rebooking? could he have been rebooking? could we have been rebooking? could you have been rebooking? could they have been rebooking?
Interro-negative form
Simple form
could I not rebook? could you not rebook? could he not rebook? could we not rebook? could you not rebook? could they not rebook?
V-ing form
could I not be rebooking? could you not be rebooking? could he not be rebooking? could we not be rebooking? could you not be rebooking? could they not be rebooking?
Perfect
could I not have rebooked? could you not have rebooked? could he not have rebooked? could we not have rebooked? could you not have rebooked? could they not have rebooked?
V-ing perfect
could I not have been rebooking? could you not have been rebooking? could he not have been rebooking? could we not have been rebooking? could you not have been rebooking? could they not have been rebooking?