English verb conjugation
CAN COUNTERVAIL

Regular verb: countervail - countervailed - countervailed

Affirmation

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

Negation

Simple form	V-ing form
I cannot countervail you cannot countervail she cannot countervail we cannot countervail you cannot countervail they cannot countervail	I cannot be countervailing you cannot be countervailing she cannot be countervailing we cannot be countervailing you cannot be countervailing they cannot be countervailing
Perfect	V-ing perfect
I cannot have countervailed you cannot have countervailed she cannot have countervailed we cannot have countervailed you cannot have countervailed they cannot have countervailed	I cannot have been countervailing you cannot have been countervailing she cannot have been countervailing we cannot have been countervailing you cannot have been countervailing they cannot have been countervailing

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can I not countervail? can you not countervail? can she not countervail? can we not countervail? can you not countervail? can they not countervail?	can I not be countervailing? can you not be countervailing? can she not be countervailing? can we not be countervailing? can you not be countervailing? can they not be countervailing?
Perfect	V-ing perfect
can I not have countervailed? can you not have countervailed? can she not have countervailed? can we not have countervailed? can you not have countervailed? can they not have countervailed?	can I not have been countervailing? can you not have been countervailing? can she not have been countervailing? can we not have been countervailing? can you not have been countervailing? can they not have been countervailing?