may countervail
Verbe régulier : countervail - countervailed- countervailed

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

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

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

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