could preharden
Verbe régulier : preharden - prehardened- prehardened

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

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

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

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