I must travail you must travail she must travail we must travail you must travail they must travail
Forma con V-ing
I must be travailing you must be travailing she must be travailing we must be travailing you must be travailing they must be travailing
Perfecto
I must have travailed you must have travailed she must have travailed we must have travailed you must have travailed they must have travailed
Perfecto con V-ing
I must have been travailing you must have been travailing she must have been travailing we must have been travailing you must have been travailing they must have been travailing
Negación
Forma simple
I must not travail you must not travail she must not travail we must not travail you must not travail they must not travail
Forma con V-ing
I must not be travailing you must not be travailing she must not be travailing we must not be travailing you must not be travailing they must not be travailing
Perfecto
I must not have travailed you must not have travailed she must not have travailed we must not have travailed you must not have travailed they must not have travailed
Perfecto con V-ing
I must not have been travailing you must not have been travailing she must not have been travailing we must not have been travailing you must not have been travailing they must not have been travailing
Forma interrogativa
Forma simple
must I travail? must you travail? must she travail? must we travail? must you travail? must they travail?
Forma con V-ing
must I be travailing? must you be travailing? must she be travailing? must we be travailing? must you be travailing? must they be travailing?
Perfecto
must I have travailed? must you have travailed? must she have travailed? must we have travailed? must you have travailed? must they have travailed?
Perfecto con V-ing
must I have been travailing? must you have been travailing? must she have been travailing? must we have been travailing? must you have been travailing? must they have been travailing?
Forma interro-negativa
Forma simple
must I not travail? must you not travail? must she not travail? must we not travail? must you not travail? must they not travail?
Forma con V-ing
must I not be travailing? must you not be travailing? must she not be travailing? must we not be travailing? must you not be travailing? must they not be travailing?
Perfecto
must I not have travailed? must you not have travailed? must she not have travailed? must we not have travailed? must you not have travailed? must they not have travailed?
Perfecto con V-ing
must I not have been travailing? must you not have been travailing? must she not have been travailing? must we not have been travailing? must you not have been travailing? must they not have been travailing?