could countervail
Verbo regular: countervail - countervailed- countervailed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't countervail
you couldn't countervail
he couldn't countervail
we couldn't countervail
you couldn't countervail
they couldn't countervail 	I couldn't be countervailing
you couldn't be countervailing
he couldn't be countervailing
we couldn't be countervailing
you couldn't be countervailing
they couldn't be countervailing	I couldn't have countervailed
you couldn't have countervailed
he couldn't have countervailed
we couldn't have countervailed
you couldn't have countervailed
they couldn't have countervailed	I couldn't have been countervailing
you couldn't have been countervailing
he couldn't have been countervailing
we couldn't have been countervailing
you couldn't have been countervailing
they couldn't have been countervailing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I countervail?
couldn't you countervail?
couldn't he countervail?
couldn't we countervail?
couldn't you countervail?
couldn't they countervail? 	couldn't I be countervailing?
couldn't you be countervailing?
couldn't he be countervailing?
couldn't we be countervailing?
couldn't you be countervailing?
couldn't they be countervailing? 	couldn't I have countervailed?
couldn't you have countervailed?
couldn't he have countervailed?
couldn't we have countervailed?
couldn't you have countervailed?
couldn't they have countervailed? 	couldn't I have been countervailing?
couldn't you have been countervailing?
couldn't he have been countervailing?
couldn't we have been countervailing?
couldn't you have been countervailing?
couldn't they have been countervailing?