I must book you must book he must book we must book you must book they must book
Forma con V-ing
I must be booking you must be booking he must be booking we must be booking you must be booking they must be booking
Perfecto
I must have booked you must have booked he must have booked we must have booked you must have booked they must have booked
Perfecto con V-ing
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
Negación
Forma simple
I mustn't book you mustn't book he mustn't book we mustn't book you mustn't book they mustn't book
Forma con V-ing
I mustn't be booking you mustn't be booking he mustn't be booking we mustn't be booking you mustn't be booking they mustn't be booking
Perfecto
I mustn't have booked you mustn't have booked he mustn't have booked we mustn't have booked you mustn't have booked they mustn't have booked
Perfecto con V-ing
I mustn't have been booking you mustn't have been booking he 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
must I book? must you book? must he book? must we book? must you book? must they book?
Forma con V-ing
must I be booking? must you be booking? must he be booking? must we be booking? must you be booking? must they be booking?
Perfecto
must I have booked? must you have booked? must he have booked? must we have booked? must you have booked? must they have booked?
Perfecto con V-ing
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-negativa
Forma simple
mustn't I book? mustn't you book? mustn't he book? mustn't we book? mustn't you book? mustn't they book?
Forma con V-ing
mustn't I be booking? mustn't you be booking? mustn't he be booking? mustn't we be booking? mustn't you be booking? mustn't they be booking?
Perfecto
mustn't I have booked? mustn't you have booked? mustn't he have booked? mustn't we have booked? mustn't you have booked? mustn't they have booked?
Perfecto con V-ing
mustn't I have been booking? mustn't you have been booking? mustn't he have been booking? mustn't we have been booking? mustn't you have been booking? mustn't they have been booking?