could prevent
Verbe régulier : prevent - prevented- prevented
Traduction française : éviter - prévenir 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could prevent
you could prevent
he could prevent
we could prevent
you could prevent
they could prevent 	I could be preventing
you could be preventing
he could be preventing
we could be preventing
you could be preventing
they could be preventing	I could have prevented
you could have prevented
he could have prevented
we could have prevented
you could have prevented
they could have prevented	I could have been preventing
you could have been preventing
he could have been preventing
we could have been preventing
you could have been preventing
they could have been preventing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could not prevent
you could not prevent
he could not prevent
we could not prevent
you could not prevent
they could not prevent 	I could not be preventing
you could not be preventing
he could not be preventing
we could not be preventing
you could not be preventing
they could not be preventing	I could not have prevented
you could not have prevented
he could not have prevented
we could not have prevented
you could not have prevented
they could not have prevented	I could not have been preventing
you could not have been preventing
he could not have been preventing
we could not have been preventing
you could not have been preventing
they could not have been preventing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I prevent?
could you prevent?
could he prevent?
could we prevent?
could you prevent?
could they prevent? 	could I be preventing?
could you be preventing?
could he be preventing?
could we be preventing?
could you be preventing?
could they be preventing? 	could I have prevented?
could you have prevented?
could he have prevented?
could we have prevented?
could you have prevented?
could they have prevented? 	could I have been preventing?
could you have been preventing?
could he have been preventing?
could we have been preventing?
could you have been preventing?
could they have been preventing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I not prevent?
could you not prevent?
could he not prevent?
could we not prevent?
could you not prevent?
could they not prevent? 	could I not be preventing?
could you not be preventing?
could he not be preventing?
could we not be preventing?
could you not be preventing?
could they not be preventing? 	could I not have prevented?
could you not have prevented?
could he not have prevented?
could we not have prevented?
could you not have prevented?
could they not have prevented? 	could I not have been preventing?
could you not have been preventing?
could he not have been preventing?
could we not have been preventing?
could you not have been preventing?
could they not have been preventing?