must bluff
Regular verb: bluff - bluffed- bluffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must bluff
you must bluff
he must bluff
we must bluff
you must bluff
they must bluff 	I must be bluffing
you must be bluffing
he must be bluffing
we must be bluffing
you must be bluffing
they must be bluffing	I must have bluffed
you must have bluffed
he must have bluffed
we must have bluffed
you must have bluffed
they must have bluffed	I must have been bluffing
you must have been bluffing
he must have been bluffing
we must have been bluffing
you must have been bluffing
they must have been bluffing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't bluff
you mustn't bluff
he mustn't bluff
we mustn't bluff
you mustn't bluff
they mustn't bluff 	I mustn't be bluffing
you mustn't be bluffing
he mustn't be bluffing
we mustn't be bluffing
you mustn't be bluffing
they mustn't be bluffing	I mustn't have bluffed
you mustn't have bluffed
he mustn't have bluffed
we mustn't have bluffed
you mustn't have bluffed
they mustn't have bluffed	I mustn't have been bluffing
you mustn't have been bluffing
he mustn't have been bluffing
we mustn't have been bluffing
you mustn't have been bluffing
they mustn't have been bluffing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I bluff?
must you bluff?
must he bluff?
must we bluff?
must you bluff?
must they bluff? 	must I be bluffing?
must you be bluffing?
must he be bluffing?
must we be bluffing?
must you be bluffing?
must they be bluffing? 	must I have bluffed?
must you have bluffed?
must he have bluffed?
must we have bluffed?
must you have bluffed?
must they have bluffed? 	must I have been bluffing?
must you have been bluffing?
must he have been bluffing?
must we have been bluffing?
must you have been bluffing?
must they have been bluffing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I bluff?
mustn't you bluff?
mustn't he bluff?
mustn't we bluff?
mustn't you bluff?
mustn't they bluff? 	mustn't I be bluffing?
mustn't you be bluffing?
mustn't he be bluffing?
mustn't we be bluffing?
mustn't you be bluffing?
mustn't they be bluffing? 	mustn't I have bluffed?
mustn't you have bluffed?
mustn't he have bluffed?
mustn't we have bluffed?
mustn't you have bluffed?
mustn't they have bluffed? 	mustn't I have been bluffing?
mustn't you have been bluffing?
mustn't he have been bluffing?
mustn't we have been bluffing?
mustn't you have been bluffing?
mustn't they have been bluffing?