English verb conjugation
COULD PREBOOK

Regular verb: prebook - prebooked - prebooked

Affirmation

Simple form	V-ing form
I could prebook you could prebook he could prebook we could prebook you could prebook they could prebook	I could be prebooking you could be prebooking he could be prebooking we could be prebooking you could be prebooking they could be prebooking
Perfect	V-ing perfect
I could have prebooked you could have prebooked he could have prebooked we could have prebooked you could have prebooked they could have prebooked	I could have been prebooking you could have been prebooking he could have been prebooking we could have been prebooking you could have been prebooking they could have been prebooking

Negation

Simple form	V-ing form
I could not prebook you could not prebook he could not prebook we could not prebook you could not prebook they could not prebook	I could not be prebooking you could not be prebooking he could not be prebooking we could not be prebooking you could not be prebooking they could not be prebooking
Perfect	V-ing perfect
I could not have prebooked you could not have prebooked he could not have prebooked we could not have prebooked you could not have prebooked they could not have prebooked	I could not have been prebooking you could not have been prebooking he could not have been prebooking we could not have been prebooking you could not have been prebooking they could not have been prebooking

Interrogative form

Simple form	V-ing form
could I prebook? could you prebook? could he prebook? could we prebook? could you prebook? could they prebook?	could I be prebooking? could you be prebooking? could he be prebooking? could we be prebooking? could you be prebooking? could they be prebooking?
Perfect	V-ing perfect
could I have prebooked? could you have prebooked? could he have prebooked? could we have prebooked? could you have prebooked? could they have prebooked?	could I have been prebooking? could you have been prebooking? could he have been prebooking? could we have been prebooking? could you have been prebooking? could they have been prebooking?

Interro-negative form

Simple form	V-ing form
could I not prebook? could you not prebook? could he not prebook? could we not prebook? could you not prebook? could they not prebook?	could I not be prebooking? could you not be prebooking? could he not be prebooking? could we not be prebooking? could you not be prebooking? could they not be prebooking?
Perfect	V-ing perfect
could I not have prebooked? could you not have prebooked? could he not have prebooked? could we not have prebooked? could you not have prebooked? could they not have prebooked?	could I not have been prebooking? could you not have been prebooking? could he not have been prebooking? could we not have been prebooking? could you not have been prebooking? could they not have been prebooking?