can countervail
Verbe régulier : countervail - countervailed- countervailed

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

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I cannot countervail
you cannot countervail
she cannot countervail
we cannot countervail
you cannot countervail
they cannot countervail 	I cannot be countervailing
you cannot be countervailing
she cannot be countervailing
we cannot be countervailing
you cannot be countervailing
they cannot be countervailing	I cannot have countervailed
you cannot have countervailed
she cannot have countervailed
we cannot have countervailed
you cannot have countervailed
they cannot have countervailed	I cannot have been countervailing
you cannot have been countervailing
she cannot have been countervailing
we cannot have been countervailing
you cannot have been countervailing
they cannot have been countervailing	

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

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