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 must not double-book you must not double-book he must not double-book we must not double-book you must not double-book they must not double-book	I must not be double-booking you must not be double-booking he must not be double-booking we must not be double-booking you must not be double-booking they must not be double-booking
Perfect	V-ing perfect
I must not have double-booked you must not have double-booked he must not have double-booked we must not have double-booked you must not have double-booked they must not have double-booked	I must not have been double-booking you must not have been double-booking he must not have been double-booking we must not have been double-booking you must not have been double-booking they must not 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
must I not double-book? must you not double-book? must he not double-book? must we not double-book? must you not double-book? must they not double-book?	must I not be double-booking? must you not be double-booking? must he not be double-booking? must we not be double-booking? must you not be double-booking? must they not be double-booking?
Perfect	V-ing perfect
must I not have double-booked? must you not have double-booked? must he not have double-booked? must we not have double-booked? must you not have double-booked? must they not have double-booked?	must I not have been double-booking? must you not have been double-booking? must he not have been double-booking? must we not have been double-booking? must you not have been double-booking? must they not have been double-booking?