can travail
Verbo regular: travail - travailed- travailed

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

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

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

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