must refer
Regelmä&szlig;iges Verb: refer - referred- referred

Bestätigung 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I must refer
you must refer
he must refer
we must refer
you must refer
they must refer 	I must be referring
you must be referring
he must be referring
we must be referring
you must be referring
they must be referring	I must have referred
you must have referred
he must have referred
we must have referred
you must have referred
they must have referred	I must have been referring
you must have been referring
he must have been referring
we must have been referring
you must have been referring
they must have been referring	

Negation 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I mustn't refer
you mustn't refer
he mustn't refer
we mustn't refer
you mustn't refer
they mustn't refer 	I mustn't be referring
you mustn't be referring
he mustn't be referring
we mustn't be referring
you mustn't be referring
they mustn't be referring	I mustn't have referred
you mustn't have referred
he mustn't have referred
we mustn't have referred
you mustn't have referred
they mustn't have referred	I mustn't have been referring
you mustn't have been referring
he mustn't have been referring
we mustn't have been referring
you mustn't have been referring
they mustn't have been referring	

Fragende Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
must I refer?
must you refer?
must he refer?
must we refer?
must you refer?
must they refer? 	must I be referring?
must you be referring?
must he be referring?
must we be referring?
must you be referring?
must they be referring? 	must I have referred?
must you have referred?
must he have referred?
must we have referred?
must you have referred?
must they have referred? 	must I have been referring?
must you have been referring?
must he have been referring?
must we have been referring?
must you have been referring?
must they have been referring? 	

Fragende Negation Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
mustn't I refer?
mustn't you refer?
mustn't he refer?
mustn't we refer?
mustn't you refer?
mustn't they refer? 	mustn't I be referring?
mustn't you be referring?
mustn't he be referring?
mustn't we be referring?
mustn't you be referring?
mustn't they be referring? 	mustn't I have referred?
mustn't you have referred?
mustn't he have referred?
mustn't we have referred?
mustn't you have referred?
mustn't they have referred? 	mustn't I have been referring?
mustn't you have been referring?
mustn't he have been referring?
mustn't we have been referring?
mustn't you have been referring?
mustn't they have been referring?