should countervail
Verbe régulier : countervail - countervailed- countervailed

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

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

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

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