must rebook
Regular verb: rebook - rebooked- rebooked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must rebook
you must rebook
he must rebook
we must rebook
you must rebook
they must rebook 	I must be rebooking
you must be rebooking
he must be rebooking
we must be rebooking
you must be rebooking
they must be rebooking	I must have rebooked
you must have rebooked
he must have rebooked
we must have rebooked
you must have rebooked
they must have rebooked	I must have been rebooking
you must have been rebooking
he must have been rebooking
we must have been rebooking
you must have been rebooking
they must have been rebooking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not rebook
you must not rebook
he must not rebook
we must not rebook
you must not rebook
they must not rebook 	I must not be rebooking
you must not be rebooking
he must not be rebooking
we must not be rebooking
you must not be rebooking
they must not be rebooking	I must not have rebooked
you must not have rebooked
he must not have rebooked
we must not have rebooked
you must not have rebooked
they must not have rebooked	I must not have been rebooking
you must not have been rebooking
he must not have been rebooking
we must not have been rebooking
you must not have been rebooking
they must not have been rebooking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I rebook?
must you rebook?
must he rebook?
must we rebook?
must you rebook?
must they rebook? 	must I be rebooking?
must you be rebooking?
must he be rebooking?
must we be rebooking?
must you be rebooking?
must they be rebooking? 	must I have rebooked?
must you have rebooked?
must he have rebooked?
must we have rebooked?
must you have rebooked?
must they have rebooked? 	must I have been rebooking?
must you have been rebooking?
must he have been rebooking?
must we have been rebooking?
must you have been rebooking?
must they have been rebooking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not rebook?
must you not rebook?
must he not rebook?
must we not rebook?
must you not rebook?
must they not rebook? 	must I not be rebooking?
must you not be rebooking?
must he not be rebooking?
must we not be rebooking?
must you not be rebooking?
must they not be rebooking? 	must I not have rebooked?
must you not have rebooked?
must he not have rebooked?
must we not have rebooked?
must you not have rebooked?
must they not have rebooked? 	must I not have been rebooking?
must you not have been rebooking?
must he not have been rebooking?
must we not have been rebooking?
must you not have been rebooking?
must they not have been rebooking?