could countervail
Verbe régulier : countervail - countervailed- countervailed

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could countervail
you could countervail
he could countervail
we could countervail
you could countervail
they could countervail 	I could be countervailing
you could be countervailing
he could be countervailing
we could be countervailing
you could be countervailing
they could be countervailing	I could have countervailed
you could have countervailed
he could have countervailed
we could have countervailed
you could have countervailed
they could have countervailed	I could have been countervailing
you could have been countervailing
he could have been countervailing
we could have been countervailing
you could have been countervailing
they could have been countervailing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could not countervail
you could not countervail
he could not countervail
we could not countervail
you could not countervail
they could not countervail 	I could not be countervailing
you could not be countervailing
he could not be countervailing
we could not be countervailing
you could not be countervailing
they could not be countervailing	I could not have countervailed
you could not have countervailed
he could not have countervailed
we could not have countervailed
you could not have countervailed
they could not have countervailed	I could not have been countervailing
you could not have been countervailing
he could not have been countervailing
we could not have been countervailing
you could not have been countervailing
they could not have been countervailing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I countervail?
could you countervail?
could he countervail?
could we countervail?
could you countervail?
could they countervail? 	could I be countervailing?
could you be countervailing?
could he be countervailing?
could we be countervailing?
could you be countervailing?
could they be countervailing? 	could I have countervailed?
could you have countervailed?
could he have countervailed?
could we have countervailed?
could you have countervailed?
could they have countervailed? 	could I have been countervailing?
could you have been countervailing?
could he have been countervailing?
could we have been countervailing?
could you have been countervailing?
could they have been countervailing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I not countervail?
could you not countervail?
could he not countervail?
could we not countervail?
could you not countervail?
could they not countervail? 	could I not be countervailing?
could you not be countervailing?
could he not be countervailing?
could we not be countervailing?
could you not be countervailing?
could they not be countervailing? 	could I not have countervailed?
could you not have countervailed?
could he not have countervailed?
could we not have countervailed?
could you not have countervailed?
could they not have countervailed? 	could I not have been countervailing?
could you not have been countervailing?
could he not have been countervailing?
could we not have been countervailing?
could you not have been countervailing?
could they not have been countervailing?