must book
Verbo regular: book - booked- booked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must book
you must book
he must book
we must book
you must book
they must book 	I must be booking
you must be booking
he must be booking
we must be booking
you must be booking
they must be booking	I must have booked
you must have booked
he must have booked
we must have booked
you must have booked
they must have booked	I must have been booking
you must have been booking
he must have been booking
we must have been booking
you must have been booking
they must have been booking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not book
you must not book
he must not book
we must not book
you must not book
they must not book 	I must not be booking
you must not be booking
he must not be booking
we must not be booking
you must not be booking
they must not be booking	I must not have booked
you must not have booked
he must not have booked
we must not have booked
you must not have booked
they must not have booked	I must not have been booking
you must not have been booking
he must not have been booking
we must not have been booking
you must not have been booking
they must not have been booking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I book?
must you book?
must he book?
must we book?
must you book?
must they book? 	must I be booking?
must you be booking?
must he be booking?
must we be booking?
must you be booking?
must they be booking? 	must I have booked?
must you have booked?
must he have booked?
must we have booked?
must you have booked?
must they have booked? 	must I have been booking?
must you have been booking?
must he have been booking?
must we have been booking?
must you have been booking?
must they have been booking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not book?
must you not book?
must he not book?
must we not book?
must you not book?
must they not book? 	must I not be booking?
must you not be booking?
must he not be booking?
must we not be booking?
must you not be booking?
must they not be booking? 	must I not have booked?
must you not have booked?
must he not have booked?
must we not have booked?
must you not have booked?
must they not have booked? 	must I not have been booking?
must you not have been booking?
must he not have been booking?
must we not have been booking?
must you not have been booking?
must they not have been booking?