I must stay you must stay she must stay we must stay you must stay they must stay
Forma con V-ing
I must be staying you must be staying she must be staying we must be staying you must be staying they must be staying
Perfecto
I must have stayed you must have stayed she must have stayed we must have stayed you must have stayed they must have stayed
Perfecto con V-ing
I must have been staying you must have been staying she must have been staying we must have been staying you must have been staying they must have been staying
Negación
Forma simple
I must not stay you must not stay she must not stay we must not stay you must not stay they must not stay
Forma con V-ing
I must not be staying you must not be staying she must not be staying we must not be staying you must not be staying they must not be staying
Perfecto
I must not have stayed you must not have stayed she must not have stayed we must not have stayed you must not have stayed they must not have stayed
Perfecto con V-ing
I must not have been staying you must not have been staying she must not have been staying we must not have been staying you must not have been staying they must not have been staying
Forma interrogativa
Forma simple
must I stay? must you stay? must she stay? must we stay? must you stay? must they stay?
Forma con V-ing
must I be staying? must you be staying? must she be staying? must we be staying? must you be staying? must they be staying?
Perfecto
must I have stayed? must you have stayed? must she have stayed? must we have stayed? must you have stayed? must they have stayed?
Perfecto con V-ing
must I have been staying? must you have been staying? must she have been staying? must we have been staying? must you have been staying? must they have been staying?
Forma interro-negativa
Forma simple
must I not stay? must you not stay? must she not stay? must we not stay? must you not stay? must they not stay?
Forma con V-ing
must I not be staying? must you not be staying? must she not be staying? must we not be staying? must you not be staying? must they not be staying?
Perfecto
must I not have stayed? must you not have stayed? must she not have stayed? must we not have stayed? must you not have stayed? must they not have stayed?
Perfecto con V-ing
must I not have been staying? must you not have been staying? must she not have been staying? must we not have been staying? must you not have been staying? must they not have been staying?