I must do you must do he must do we must do you must do they must do
Forma con V-ing
I must be doing you must be doing he must be doing we must be doing you must be doing they must be doing
Perfecto
I must have done you must have done he must have done we must have done you must have done they must have done
Perfecto con V-ing
I must have been doing you must have been doing he must have been doing we must have been doing you must have been doing they must have been doing
Negación
Forma simple
I must not do you must not do he must not do we must not do you must not do they must not do
Forma con V-ing
I must not be doing you must not be doing he must not be doing we must not be doing you must not be doing they must not be doing
Perfecto
I must not have done you must not have done he must not have done we must not have done you must not have done they must not have done
Perfecto con V-ing
I must not have been doing you must not have been doing he must not have been doing we must not have been doing you must not have been doing they must not have been doing
Forma interrogativa
Forma simple
must I do? must you do? must he do? must we do? must you do? must they do?
Forma con V-ing
must I be doing? must you be doing? must he be doing? must we be doing? must you be doing? must they be doing?
Perfecto
must I have done? must you have done? must he have done? must we have done? must you have done? must they have done?
Perfecto con V-ing
must I have been doing? must you have been doing? must he have been doing? must we have been doing? must you have been doing? must they have been doing?
Forma interro-negativa
Forma simple
must I not do? must you not do? must he not do? must we not do? must you not do? must they not do?
Forma con V-ing
must I not be doing? must you not be doing? must he not be doing? must we not be doing? must you not be doing? must they not be doing?
Perfecto
must I not have done? must you not have done? must he not have done? must we not have done? must you not have done? must they not have done?
Perfecto con V-ing
must I not have been doing? must you not have been doing? must he not have been doing? must we not have been doing? must you not have been doing? must they not have been doing?