could vail
Verbo regular: vail - vailed- vailed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could vail
you could vail
he could vail
we could vail
you could vail
they could vail 	I could be vailing
you could be vailing
he could be vailing
we could be vailing
you could be vailing
they could be vailing	I could have vailed
you could have vailed
he could have vailed
we could have vailed
you could have vailed
they could have vailed	I could have been vailing
you could have been vailing
he could have been vailing
we could have been vailing
you could have been vailing
they could have been vailing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't vail
you couldn't vail
he couldn't vail
we couldn't vail
you couldn't vail
they couldn't vail 	I couldn't be vailing
you couldn't be vailing
he couldn't be vailing
we couldn't be vailing
you couldn't be vailing
they couldn't be vailing	I couldn't have vailed
you couldn't have vailed
he couldn't have vailed
we couldn't have vailed
you couldn't have vailed
they couldn't have vailed	I couldn't have been vailing
you couldn't have been vailing
he couldn't have been vailing
we couldn't have been vailing
you couldn't have been vailing
they couldn't have been vailing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I vail?
could you vail?
could he vail?
could we vail?
could you vail?
could they vail? 	could I be vailing?
could you be vailing?
could he be vailing?
could we be vailing?
could you be vailing?
could they be vailing? 	could I have vailed?
could you have vailed?
could he have vailed?
could we have vailed?
could you have vailed?
could they have vailed? 	could I have been vailing?
could you have been vailing?
could he have been vailing?
could we have been vailing?
could you have been vailing?
could they have been vailing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I vail?
couldn't you vail?
couldn't he vail?
couldn't we vail?
couldn't you vail?
couldn't they vail? 	couldn't I be vailing?
couldn't you be vailing?
couldn't he be vailing?
couldn't we be vailing?
couldn't you be vailing?
couldn't they be vailing? 	couldn't I have vailed?
couldn't you have vailed?
couldn't he have vailed?
couldn't we have vailed?
couldn't you have vailed?
couldn't they have vailed? 	couldn't I have been vailing?
couldn't you have been vailing?
couldn't he have been vailing?
couldn't we have been vailing?
couldn't you have been vailing?
couldn't they have been vailing?