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 mustn't rebook
you mustn't rebook
he mustn't rebook
we mustn't rebook
you mustn't rebook
they mustn't rebook 	I mustn't be rebooking
you mustn't be rebooking
he mustn't be rebooking
we mustn't be rebooking
you mustn't be rebooking
they mustn't be rebooking	I mustn't have rebooked
you mustn't have rebooked
he mustn't have rebooked
we mustn't have rebooked
you mustn't have rebooked
they mustn't have rebooked	I mustn't have been rebooking
you mustn't have been rebooking
he mustn't have been rebooking
we mustn't have been rebooking
you mustn't have been rebooking
they mustn't 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 	
mustn't I rebook?
mustn't you rebook?
mustn't he rebook?
mustn't we rebook?
mustn't you rebook?
mustn't they rebook? 	mustn't I be rebooking?
mustn't you be rebooking?
mustn't he be rebooking?
mustn't we be rebooking?
mustn't you be rebooking?
mustn't they be rebooking? 	mustn't I have rebooked?
mustn't you have rebooked?
mustn't he have rebooked?
mustn't we have rebooked?
mustn't you have rebooked?
mustn't they have rebooked? 	mustn't I have been rebooking?
mustn't you have been rebooking?
mustn't he have been rebooking?
mustn't we have been rebooking?
mustn't you have been rebooking?
mustn't they have been rebooking?