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