English verb conjugation
COULD BOOK

Regular verb: book - booked - booked

Affirmation

Simple form	V-ing form
I could book you could book he could book we could book you could book they could book	I could be booking you could be booking he could be booking we could be booking you could be booking they could be booking
Perfect	V-ing perfect
I could have booked you could have booked he could have booked we could have booked you could have booked they could have booked	I could have been booking you could have been booking he could have been booking we could have been booking you could have been booking they could have been booking

Negation

Simple form	V-ing form
I couldn't book you couldn't book he couldn't book we couldn't book you couldn't book they couldn't book	I couldn't be booking you couldn't be booking he couldn't be booking we couldn't be booking you couldn't be booking they couldn't be booking
Perfect	V-ing perfect
I couldn't have booked you couldn't have booked he couldn't have booked we couldn't have booked you couldn't have booked they couldn't have booked	I couldn't have been booking you couldn't have been booking he couldn't have been booking we couldn't have been booking you couldn't have been booking they couldn't have been booking

Interrogative form

Simple form	V-ing form
could I book? could you book? could he book? could we book? could you book? could they book?	could I be booking? could you be booking? could he be booking? could we be booking? could you be booking? could they be booking?
Perfect	V-ing perfect
could I have booked? could you have booked? could he have booked? could we have booked? could you have booked? could they have booked?	could I have been booking? could you have been booking? could he have been booking? could we have been booking? could you have been booking? could they have been booking?

Interro-negative form

Simple form	V-ing form
couldn't I book? couldn't you book? couldn't he book? couldn't we book? couldn't you book? couldn't they book?	couldn't I be booking? couldn't you be booking? couldn't he be booking? couldn't we be booking? couldn't you be booking? couldn't they be booking?
Perfect	V-ing perfect
couldn't I have booked? couldn't you have booked? couldn't he have booked? couldn't we have booked? couldn't you have booked? couldn't they have booked?	couldn't I have been booking? couldn't you have been booking? couldn't he have been booking? couldn't we have been booking? couldn't you have been booking? couldn't they have been booking?