must biff
Regelmä&szlig;iges Verb: biff - biffed- biffed

Bestätigung 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I must biff
you must biff
he must biff
we must biff
you must biff
they must biff 	I must be biffing
you must be biffing
he must be biffing
we must be biffing
you must be biffing
they must be biffing	I must have biffed
you must have biffed
he must have biffed
we must have biffed
you must have biffed
they must have biffed	I must have been biffing
you must have been biffing
he must have been biffing
we must have been biffing
you must have been biffing
they must have been biffing	

Negation 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I mustn't biff
you mustn't biff
he mustn't biff
we mustn't biff
you mustn't biff
they mustn't biff 	I mustn't be biffing
you mustn't be biffing
he mustn't be biffing
we mustn't be biffing
you mustn't be biffing
they mustn't be biffing	I mustn't have biffed
you mustn't have biffed
he mustn't have biffed
we mustn't have biffed
you mustn't have biffed
they mustn't have biffed	I mustn't have been biffing
you mustn't have been biffing
he mustn't have been biffing
we mustn't have been biffing
you mustn't have been biffing
they mustn't have been biffing	

Fragende Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
must I biff?
must you biff?
must he biff?
must we biff?
must you biff?
must they biff? 	must I be biffing?
must you be biffing?
must he be biffing?
must we be biffing?
must you be biffing?
must they be biffing? 	must I have biffed?
must you have biffed?
must he have biffed?
must we have biffed?
must you have biffed?
must they have biffed? 	must I have been biffing?
must you have been biffing?
must he have been biffing?
must we have been biffing?
must you have been biffing?
must they have been biffing? 	

Fragende Negation Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
mustn't I biff?
mustn't you biff?
mustn't he biff?
mustn't we biff?
mustn't you biff?
mustn't they biff? 	mustn't I be biffing?
mustn't you be biffing?
mustn't he be biffing?
mustn't we be biffing?
mustn't you be biffing?
mustn't they be biffing? 	mustn't I have biffed?
mustn't you have biffed?
mustn't he have biffed?
mustn't we have biffed?
mustn't you have biffed?
mustn't they have biffed? 	mustn't I have been biffing?
mustn't you have been biffing?
mustn't he have been biffing?
mustn't we have been biffing?
mustn't you have been biffing?
mustn't they have been biffing?