may countervail
Regular verb: countervail - countervailed- countervailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may countervail
you may countervail
he may countervail
we may countervail
you may countervail
they may countervail 	I may be countervailing
you may be countervailing
he may be countervailing
we may be countervailing
you may be countervailing
they may be countervailing	I may have countervailed
you may have countervailed
he 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
he may have been countervailing
we may have been countervailing
you may have been countervailing
they may have been countervailing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may not countervail
you may not countervail
he may not countervail
we may not countervail
you may not countervail
they may not countervail 	I may not be countervailing
you may not be countervailing
he may not be countervailing
we may not be countervailing
you may not be countervailing
they may not be countervailing	I may not have countervailed
you may not have countervailed
he may not have countervailed
we may not have countervailed
you may not have countervailed
they may not have countervailed	I may not have been countervailing
you may not have been countervailing
he may not have been countervailing
we may not have been countervailing
you may not have been countervailing
they may not have been countervailing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I countervail?
may you countervail?
may he countervail?
may we countervail?
may you countervail?
may they countervail? 	may I be countervailing?
may you be countervailing?
may he be countervailing?
may we be countervailing?
may you be countervailing?
may they be countervailing? 	may I have countervailed?
may you have countervailed?
may he 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 he have been countervailing?
may we have been countervailing?
may you have been countervailing?
may they have been countervailing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I not countervail?
may you not countervail?
may he not countervail?
may we not countervail?
may you not countervail?
may they not countervail? 	may I not be countervailing?
may you not be countervailing?
may he not be countervailing?
may we not be countervailing?
may you not be countervailing?
may they not be countervailing? 	may I not have countervailed?
may you not have countervailed?
may he not have countervailed?
may we not have countervailed?
may you not have countervailed?
may they not have countervailed? 	may I not have been countervailing?
may you not have been countervailing?
may he not have been countervailing?
may we not have been countervailing?
may you not have been countervailing?
may they not have been countervailing?