shall countervail
Regular verb: countervail - countervailed- countervailed

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

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

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

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