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
he can countervail
we can countervail
you can countervail
they can countervail 	I can be countervailing
you can be countervailing
he can be countervailing
we can be countervailing
you can be countervailing
they can be countervailing	I can have countervailed
you can have countervailed
he 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
he 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 can't countervail
you can't countervail
he can't countervail
we can't countervail
you can't countervail
they can't countervail 	I can't be countervailing
you can't be countervailing
he can't be countervailing
we can't be countervailing
you can't be countervailing
they can't be countervailing	I can't have countervailed
you can't have countervailed
he can't have countervailed
we can't have countervailed
you can't have countervailed
they can't have countervailed	I can't have been countervailing
you can't have been countervailing
he can't have been countervailing
we can't have been countervailing
you can't have been countervailing
they can't have been countervailing	

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