Regular verb: book book - book booked - book booked
Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I must book book you must book book he must book book we must book book you must book book they must book book
V-ing form
I must be book booking you must be book booking he must be book booking we must be book booking you must be book booking they must be book booking
Perfect
I must have book booked you must have book booked he must have book booked we must have book booked you must have book booked they must have book booked
V-ing perfect
I must have been book booking you must have been book booking he must have been book booking we must have been book booking you must have been book booking they must have been book booking
Negation
Simple form
I mustn't book book you mustn't book book he mustn't book book we mustn't book book you mustn't book book they mustn't book book
V-ing form
I mustn't be book booking you mustn't be book booking he mustn't be book booking we mustn't be book booking you mustn't be book booking they mustn't be book booking
Perfect
I mustn't have book booked you mustn't have book booked he mustn't have book booked we mustn't have book booked you mustn't have book booked they mustn't have book booked
V-ing perfect
I mustn't have been book booking you mustn't have been book booking he mustn't have been book booking we mustn't have been book booking you mustn't have been book booking they mustn't have been book booking
Interrogative form
Simple form
must I book book? must you book book? must he book book? must we book book? must you book book? must they book book?
V-ing form
must I be book booking? must you be book booking? must he be book booking? must we be book booking? must you be book booking? must they be book booking?
Perfect
must I have book booked? must you have book booked? must he have book booked? must we have book booked? must you have book booked? must they have book booked?
V-ing perfect
must I have been book booking? must you have been book booking? must he have been book booking? must we have been book booking? must you have been book booking? must they have been book booking?
Interro-negative form
Simple form
mustn't I book book? mustn't you book book? mustn't he book book? mustn't we book book? mustn't you book book? mustn't they book book?
V-ing form
mustn't I be book booking? mustn't you be book booking? mustn't he be book booking? mustn't we be book booking? mustn't you be book booking? mustn't they be book booking?
Perfect
mustn't I have book booked? mustn't you have book booked? mustn't he have book booked? mustn't we have book booked? mustn't you have book booked? mustn't they have book booked?
V-ing perfect
mustn't I have been book booking? mustn't you have been book booking? mustn't he have been book booking? mustn't we have been book booking? mustn't you have been book booking? mustn't they have been book booking?