English verb conjugation
COULD TRAVAIL

Regular verb: travail - travailed - travailed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?