I must scratch you must scratch he must scratch we must scratch you must scratch they must scratch
Forma con V-ing
I must be scratching you must be scratching he must be scratching we must be scratching you must be scratching they must be scratching
Perfecto
I must have scratched you must have scratched he must have scratched we must have scratched you must have scratched they must have scratched
Perfecto con V-ing
I must have been scratching you must have been scratching he must have been scratching we must have been scratching you must have been scratching they must have been scratching
Negación
Forma simple
I must not scratch you must not scratch he must not scratch we must not scratch you must not scratch they must not scratch
Forma con V-ing
I must not be scratching you must not be scratching he must not be scratching we must not be scratching you must not be scratching they must not be scratching
Perfecto
I must not have scratched you must not have scratched he must not have scratched we must not have scratched you must not have scratched they must not have scratched
Perfecto con V-ing
I must not have been scratching you must not have been scratching he must not have been scratching we must not have been scratching you must not have been scratching they must not have been scratching
Forma interrogativa
Forma simple
must I scratch? must you scratch? must he scratch? must we scratch? must you scratch? must they scratch?
Forma con V-ing
must I be scratching? must you be scratching? must he be scratching? must we be scratching? must you be scratching? must they be scratching?
Perfecto
must I have scratched? must you have scratched? must he have scratched? must we have scratched? must you have scratched? must they have scratched?
Perfecto con V-ing
must I have been scratching? must you have been scratching? must he have been scratching? must we have been scratching? must you have been scratching? must they have been scratching?
Forma interro-negativa
Forma simple
must I not scratch? must you not scratch? must he not scratch? must we not scratch? must you not scratch? must they not scratch?
Forma con V-ing
must I not be scratching? must you not be scratching? must he not be scratching? must we not be scratching? must you not be scratching? must they not be scratching?
Perfecto
must I not have scratched? must you not have scratched? must he not have scratched? must we not have scratched? must you not have scratched? must they not have scratched?
Perfecto con V-ing
must I not have been scratching? must you not have been scratching? must he not have been scratching? must we not have been scratching? must you not have been scratching? must they not have been scratching?