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 couldn't rebook you couldn't rebook he couldn't rebook we couldn't rebook you couldn't rebook they couldn't rebook
V-ing form
I couldn't be rebooking you couldn't be rebooking he couldn't be rebooking we couldn't be rebooking you couldn't be rebooking they couldn't be rebooking
Perfect
I couldn't have rebooked you couldn't have rebooked he couldn't have rebooked we couldn't have rebooked you couldn't have rebooked they couldn't have rebooked
V-ing perfect
I couldn't have been rebooking you couldn't have been rebooking he couldn't have been rebooking we couldn't have been rebooking you couldn't have been rebooking they couldn't 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
couldn't I rebook? couldn't you rebook? couldn't he rebook? couldn't we rebook? couldn't you rebook? couldn't they rebook?
V-ing form
couldn't I be rebooking? couldn't you be rebooking? couldn't he be rebooking? couldn't we be rebooking? couldn't you be rebooking? couldn't they be rebooking?
Perfect
couldn't I have rebooked? couldn't you have rebooked? couldn't he have rebooked? couldn't we have rebooked? couldn't you have rebooked? couldn't they have rebooked?
V-ing perfect
couldn't I have been rebooking? couldn't you have been rebooking? couldn't he have been rebooking? couldn't we have been rebooking? couldn't you have been rebooking? couldn't they have been rebooking?