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
she could countervail
we could countervail
you could countervail
they could countervail 	I could be countervailing
you could be countervailing
she could be countervailing
we could be countervailing
you could be countervailing
they could be countervailing	I could have countervailed
you could have countervailed
she 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
she 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 couldn't countervail
you couldn't countervail
she couldn't countervail
we couldn't countervail
you couldn't countervail
they couldn't countervail 	I couldn't be countervailing
you couldn't be countervailing
she couldn't be countervailing
we couldn't be countervailing
you couldn't be countervailing
they couldn't be countervailing	I couldn't have countervailed
you couldn't have countervailed
she couldn't have countervailed
we couldn't have countervailed
you couldn't have countervailed
they couldn't have countervailed	I couldn't have been countervailing
you couldn't have been countervailing
she couldn't have been countervailing
we couldn't have been countervailing
you couldn't have been countervailing
they couldn't have been countervailing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I countervail?
could you countervail?
could she countervail?
could we countervail?
could you countervail?
could they countervail? 	could I be countervailing?
could you be countervailing?
could she be countervailing?
could we be countervailing?
could you be countervailing?
could they be countervailing? 	could I have countervailed?
could you have countervailed?
could she 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 she 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 	
couldn't I countervail?
couldn't you countervail?
couldn't she countervail?
couldn't we countervail?
couldn't you countervail?
couldn't they countervail? 	couldn't I be countervailing?
couldn't you be countervailing?
couldn't she be countervailing?
couldn't we be countervailing?
couldn't you be countervailing?
couldn't they be countervailing? 	couldn't I have countervailed?
couldn't you have countervailed?
couldn't she have countervailed?
couldn't we have countervailed?
couldn't you have countervailed?
couldn't they have countervailed? 	couldn't I have been countervailing?
couldn't you have been countervailing?
couldn't she have been countervailing?
couldn't we have been countervailing?
couldn't you have been countervailing?
couldn't they have been countervailing?