English verb conjugation
CAN BOOK

Regular verb: book - booked - booked

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can I not book? can you not book? can he not book? can we not book? can you not book? can they not book?	can I not be booking? can you not be booking? can he not be booking? can we not be booking? can you not be booking? can they not be booking?
Perfect	V-ing perfect
can I not have booked? can you not have booked? can he not have booked? can we not have booked? can you not have booked? can they not have booked?	can I not have been booking? can you not have been booking? can he not have been booking? can we not have been booking? can you not have been booking? can they not have been booking?