must toughen
Regelmä&szlig;iges Verb: toughen - toughened- toughened

Bestätigung 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I must toughen
you must toughen
he must toughen
we must toughen
you must toughen
they must toughen 	I must be toughening
you must be toughening
he must be toughening
we must be toughening
you must be toughening
they must be toughening	I must have toughened
you must have toughened
he must have toughened
we must have toughened
you must have toughened
they must have toughened	I must have been toughening
you must have been toughening
he must have been toughening
we must have been toughening
you must have been toughening
they must have been toughening	

Negation 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I mustn't toughen
you mustn't toughen
he mustn't toughen
we mustn't toughen
you mustn't toughen
they mustn't toughen 	I mustn't be toughening
you mustn't be toughening
he mustn't be toughening
we mustn't be toughening
you mustn't be toughening
they mustn't be toughening	I mustn't have toughened
you mustn't have toughened
he mustn't have toughened
we mustn't have toughened
you mustn't have toughened
they mustn't have toughened	I mustn't have been toughening
you mustn't have been toughening
he mustn't have been toughening
we mustn't have been toughening
you mustn't have been toughening
they mustn't have been toughening	

Fragende Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
must I toughen?
must you toughen?
must he toughen?
must we toughen?
must you toughen?
must they toughen? 	must I be toughening?
must you be toughening?
must he be toughening?
must we be toughening?
must you be toughening?
must they be toughening? 	must I have toughened?
must you have toughened?
must he have toughened?
must we have toughened?
must you have toughened?
must they have toughened? 	must I have been toughening?
must you have been toughening?
must he have been toughening?
must we have been toughening?
must you have been toughening?
must they have been toughening? 	

Fragende Negation Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
mustn't I toughen?
mustn't you toughen?
mustn't he toughen?
mustn't we toughen?
mustn't you toughen?
mustn't they toughen? 	mustn't I be toughening?
mustn't you be toughening?
mustn't he be toughening?
mustn't we be toughening?
mustn't you be toughening?
mustn't they be toughening? 	mustn't I have toughened?
mustn't you have toughened?
mustn't he have toughened?
mustn't we have toughened?
mustn't you have toughened?
mustn't they have toughened? 	mustn't I have been toughening?
mustn't you have been toughening?
mustn't he have been toughening?
mustn't we have been toughening?
mustn't you have been toughening?
mustn't they have been toughening?