English verb conjugation
CAN TRAVAIL

Regular verb: travail - travailed - travailed

Affirmation

Simple form	V-ing form
I can travail you can travail she can travail we can travail you can travail they can travail	I can be travailing you can be travailing she can be travailing we can be travailing you can be travailing they can be travailing
Perfect	V-ing perfect
I can have travailed you can have travailed she 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 she can have been travailing we can have been travailing you can have been travailing they can have been travailing

Negation

Simple form	V-ing form
I cannot travail you cannot travail she cannot travail we cannot travail you cannot travail they cannot travail	I cannot be travailing you cannot be travailing she cannot be travailing we cannot be travailing you cannot be travailing they cannot be travailing
Perfect	V-ing perfect
I cannot have travailed you cannot have travailed she 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 she cannot have been travailing we cannot have been travailing you cannot have been travailing they cannot have been travailing

Interrogative form

Simple form	V-ing form
can I travail? can you travail? can she travail? can we travail? can you travail? can they travail?	can I be travailing? can you be travailing? can she be travailing? can we be travailing? can you be travailing? can they be travailing?
Perfect	V-ing perfect
can I have travailed? can you have travailed? can she 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 she have been travailing? can we have been travailing? can you have been travailing? can they have been travailing?

Interro-negative form

Simple form	V-ing form
can I not travail? can you not travail? can she 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 she not be travailing? can we not be travailing? can you not be travailing? can they not be travailing?
Perfect	V-ing perfect
can I not have travailed? can you not have travailed? can she 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 she not have been travailing? can we not have been travailing? can you not have been travailing? can they not have been travailing?