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
she must book
we must book
you must book
they must book 	I must be booking
you must be booking
she must be booking
we must be booking
you must be booking
they must be booking	I must have booked
you must have booked
she 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
she 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 mustn't book
you mustn't book
she mustn't book
we mustn't book
you mustn't book
they mustn't book 	I mustn't be booking
you mustn't be booking
she mustn't be booking
we mustn't be booking
you mustn't be booking
they mustn't be booking	I mustn't have booked
you mustn't have booked
she mustn't have booked
we mustn't have booked
you mustn't have booked
they mustn't have booked	I mustn't have been booking
you mustn't have been booking
she mustn't have been booking
we mustn't have been booking
you mustn't have been booking
they mustn't have been booking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I book?
must you book?
must she book?
must we book?
must you book?
must they book? 	must I be booking?
must you be booking?
must she be booking?
must we be booking?
must you be booking?
must they be booking? 	must I have booked?
must you have booked?
must she 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 she 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 	
mustn't I book?
mustn't you book?
mustn't she book?
mustn't we book?
mustn't you book?
mustn't they book? 	mustn't I be booking?
mustn't you be booking?
mustn't she be booking?
mustn't we be booking?
mustn't you be booking?
mustn't they be booking? 	mustn't I have booked?
mustn't you have booked?
mustn't she have booked?
mustn't we have booked?
mustn't you have booked?
mustn't they have booked? 	mustn't I have been booking?
mustn't you have been booking?
mustn't she have been booking?
mustn't we have been booking?
mustn't you have been booking?
mustn't they have been booking?