English verb conjugation
COULD COUNTERVAIL

Regular verb: countervail - countervailed - countervailed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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