could fester
Verbe régulier : fester - festered- festered
Traduction française : suppurer (UK) buller 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could fester
you could fester
she could fester
we could fester
you could fester
they could fester 	I could be festering
you could be festering
she could be festering
we could be festering
you could be festering
they could be festering	I could have festered
you could have festered
she could have festered
we could have festered
you could have festered
they could have festered	I could have been festering
you could have been festering
she could have been festering
we could have been festering
you could have been festering
they could have been festering	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could not fester
you could not fester
she could not fester
we could not fester
you could not fester
they could not fester 	I could not be festering
you could not be festering
she could not be festering
we could not be festering
you could not be festering
they could not be festering	I could not have festered
you could not have festered
she could not have festered
we could not have festered
you could not have festered
they could not have festered	I could not have been festering
you could not have been festering
she could not have been festering
we could not have been festering
you could not have been festering
they could not have been festering	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I fester?
could you fester?
could she fester?
could we fester?
could you fester?
could they fester? 	could I be festering?
could you be festering?
could she be festering?
could we be festering?
could you be festering?
could they be festering? 	could I have festered?
could you have festered?
could she have festered?
could we have festered?
could you have festered?
could they have festered? 	could I have been festering?
could you have been festering?
could she have been festering?
could we have been festering?
could you have been festering?
could they have been festering? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I not fester?
could you not fester?
could she not fester?
could we not fester?
could you not fester?
could they not fester? 	could I not be festering?
could you not be festering?
could she not be festering?
could we not be festering?
could you not be festering?
could they not be festering? 	could I not have festered?
could you not have festered?
could she not have festered?
could we not have festered?
could you not have festered?
could they not have festered? 	could I not have been festering?
could you not have been festering?
could she not have been festering?
could we not have been festering?
could you not have been festering?
could they not have been festering?