must preharden
Verbe régulier : preharden - prehardened- prehardened

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must preharden
you must preharden
he must preharden
we must preharden
you must preharden
they must preharden 	I must be prehardening
you must be prehardening
he must be prehardening
we must be prehardening
you must be prehardening
they must be prehardening	I must have prehardened
you must have prehardened
he must have prehardened
we must have prehardened
you must have prehardened
they must have prehardened	I must have been prehardening
you must have been prehardening
he must have been prehardening
we must have been prehardening
you must have been prehardening
they must have been prehardening	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't preharden
you mustn't preharden
he mustn't preharden
we mustn't preharden
you mustn't preharden
they mustn't preharden 	I mustn't be prehardening
you mustn't be prehardening
he mustn't be prehardening
we mustn't be prehardening
you mustn't be prehardening
they mustn't be prehardening	I mustn't have prehardened
you mustn't have prehardened
he mustn't have prehardened
we mustn't have prehardened
you mustn't have prehardened
they mustn't have prehardened	I mustn't have been prehardening
you mustn't have been prehardening
he mustn't have been prehardening
we mustn't have been prehardening
you mustn't have been prehardening
they mustn't have been prehardening	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I preharden?
must you preharden?
must he preharden?
must we preharden?
must you preharden?
must they preharden? 	must I be prehardening?
must you be prehardening?
must he be prehardening?
must we be prehardening?
must you be prehardening?
must they be prehardening? 	must I have prehardened?
must you have prehardened?
must he have prehardened?
must we have prehardened?
must you have prehardened?
must they have prehardened? 	must I have been prehardening?
must you have been prehardening?
must he have been prehardening?
must we have been prehardening?
must you have been prehardening?
must they have been prehardening? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I preharden?
mustn't you preharden?
mustn't he preharden?
mustn't we preharden?
mustn't you preharden?
mustn't they preharden? 	mustn't I be prehardening?
mustn't you be prehardening?
mustn't he be prehardening?
mustn't we be prehardening?
mustn't you be prehardening?
mustn't they be prehardening? 	mustn't I have prehardened?
mustn't you have prehardened?
mustn't he have prehardened?
mustn't we have prehardened?
mustn't you have prehardened?
mustn't they have prehardened? 	mustn't I have been prehardening?
mustn't you have been prehardening?
mustn't he have been prehardening?
mustn't we have been prehardening?
mustn't you have been prehardening?
mustn't they have been prehardening?