could travail
Verbo regular: travail - travailed- travailed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could travail
you could travail
he could travail
we could travail
you could travail
they could travail 	I could be travailing
you could be travailing
he could be travailing
we could be travailing
you could be travailing
they could be travailing	I could have travailed
you could have travailed
he could have travailed
we could have travailed
you could have travailed
they could have travailed	I could have been travailing
you could have been travailing
he could have been travailing
we could have been travailing
you could have been travailing
they could have been travailing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't travail
you couldn't travail
he couldn't travail
we couldn't travail
you couldn't travail
they couldn't travail 	I couldn't be travailing
you couldn't be travailing
he couldn't be travailing
we couldn't be travailing
you couldn't be travailing
they couldn't be travailing	I couldn't have travailed
you couldn't have travailed
he couldn't have travailed
we couldn't have travailed
you couldn't have travailed
they couldn't have travailed	I couldn't have been travailing
you couldn't have been travailing
he couldn't have been travailing
we couldn't have been travailing
you couldn't have been travailing
they couldn't have been travailing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I travail?
could you travail?
could he travail?
could we travail?
could you travail?
could they travail? 	could I be travailing?
could you be travailing?
could he be travailing?
could we be travailing?
could you be travailing?
could they be travailing? 	could I have travailed?
could you have travailed?
could he have travailed?
could we have travailed?
could you have travailed?
could they have travailed? 	could I have been travailing?
could you have been travailing?
could he have been travailing?
could we have been travailing?
could you have been travailing?
could they have been travailing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I travail?
couldn't you travail?
couldn't he travail?
couldn't we travail?
couldn't you travail?
couldn't they travail? 	couldn't I be travailing?
couldn't you be travailing?
couldn't he be travailing?
couldn't we be travailing?
couldn't you be travailing?
couldn't they be travailing? 	couldn't I have travailed?
couldn't you have travailed?
couldn't he have travailed?
couldn't we have travailed?
couldn't you have travailed?
couldn't they have travailed? 	couldn't I have been travailing?
couldn't you have been travailing?
couldn't he have been travailing?
couldn't we have been travailing?
couldn't you have been travailing?
couldn't they have been travailing?