English verb conjugation
MUST DOUBLE-BOOK

Regular verb: double-book - double-booked - double-booked

Affirmation

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

Negation

Simple form	V-ing form
I mustn't double-book you mustn't double-book he mustn't double-book we mustn't double-book you mustn't double-book they mustn't double-book	I mustn't be double-booking you mustn't be double-booking he mustn't be double-booking we mustn't be double-booking you mustn't be double-booking they mustn't be double-booking
Perfect	V-ing perfect
I mustn't have double-booked you mustn't have double-booked he mustn't have double-booked we mustn't have double-booked you mustn't have double-booked they mustn't have double-booked	I mustn't have been double-booking you mustn't have been double-booking he mustn't have been double-booking we mustn't have been double-booking you mustn't have been double-booking they mustn't have been double-booking

Interrogative form

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

Interro-negative form

Simple form	V-ing form
mustn't I double-book? mustn't you double-book? mustn't he double-book? mustn't we double-book? mustn't you double-book? mustn't they double-book?	mustn't I be double-booking? mustn't you be double-booking? mustn't he be double-booking? mustn't we be double-booking? mustn't you be double-booking? mustn't they be double-booking?
Perfect	V-ing perfect
mustn't I have double-booked? mustn't you have double-booked? mustn't he have double-booked? mustn't we have double-booked? mustn't you have double-booked? mustn't they have double-booked?	mustn't I have been double-booking? mustn't you have been double-booking? mustn't he have been double-booking? mustn't we have been double-booking? mustn't you have been double-booking? mustn't they have been double-booking?