ought to countervail
Regular verb: countervail - countervailed- countervailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to countervail
you ought to countervail
she ought to countervail
we ought to countervail
you ought to countervail
they ought to countervail 	I ought to be countervailing
you ought to be countervailing
she ought to be countervailing
we ought to be countervailing
you ought to be countervailing
they ought to be countervailing	I ought to have countervailed
you ought to have countervailed
she ought to have countervailed
we ought to have countervailed
you ought to have countervailed
they ought to have countervailed	I ought to have been countervailing
you ought to have been countervailing
she ought to have been countervailing
we ought to have been countervailing
you ought to have been countervailing
they ought to have been countervailing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to countervail
you oughtn't to countervail
she oughtn't to countervail
we oughtn't to countervail
you oughtn't to countervail
they oughtn't to countervail 	I oughtn't to be countervailing
you oughtn't to be countervailing
she oughtn't to be countervailing
we oughtn't to be countervailing
you oughtn't to be countervailing
they oughtn't to be countervailing	I oughtn't to have countervailed
you oughtn't to have countervailed
she oughtn't to have countervailed
we oughtn't to have countervailed
you oughtn't to have countervailed
they oughtn't to have countervailed	I oughtn't to have been countervailing
you oughtn't to have been countervailing
she oughtn't to have been countervailing
we oughtn't to have been countervailing
you oughtn't to have been countervailing
they oughtn't to have been countervailing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I countervail?
ought to you countervail?
ought to she countervail?
ought to we countervail?
ought to you countervail?
ought to they countervail? 	ought to I be countervailing?
ought to you be countervailing?
ought to she be countervailing?
ought to we be countervailing?
ought to you be countervailing?
ought to they be countervailing? 	ought to I have countervailed?
ought to you have countervailed?
ought to she have countervailed?
ought to we have countervailed?
ought to you have countervailed?
ought to they have countervailed? 	ought to I have been countervailing?
ought to you have been countervailing?
ought to she have been countervailing?
ought to we have been countervailing?
ought to you have been countervailing?
ought to they have been countervailing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to countervail?
oughtn't you to countervail?
oughtn't she to countervail?
oughtn't we to countervail?
oughtn't you to countervail?
oughtn't they to countervail? 	oughtn't I to be countervailing?
oughtn't you to be countervailing?
oughtn't she to be countervailing?
oughtn't we to be countervailing?
oughtn't you to be countervailing?
oughtn't they to be countervailing? 	oughtn't I to have countervailed?
oughtn't you to have countervailed?
oughtn't she to have countervailed?
oughtn't we to have countervailed?
oughtn't you to have countervailed?
oughtn't they to have countervailed? 	oughtn't I to have been countervailing?
oughtn't you to have been countervailing?
oughtn't she to have been countervailing?
oughtn't we to have been countervailing?
oughtn't you to have been countervailing?
oughtn't they to have been countervailing?