I must save you must save he must save we must save you must save they must save
Forma con V-ing
I must be saving you must be saving he must be saving we must be saving you must be saving they must be saving
Perfecto
I must have saved you must have saved he must have saved we must have saved you must have saved they must have saved
Perfecto con V-ing
I must have been saving you must have been saving he must have been saving we must have been saving you must have been saving they must have been saving
Negación
Forma simple
I must not save you must not save he must not save we must not save you must not save they must not save
Forma con V-ing
I must not be saving you must not be saving he must not be saving we must not be saving you must not be saving they must not be saving
Perfecto
I must not have saved you must not have saved he must not have saved we must not have saved you must not have saved they must not have saved
Perfecto con V-ing
I must not have been saving you must not have been saving he must not have been saving we must not have been saving you must not have been saving they must not have been saving
Forma interrogativa
Forma simple
must I save? must you save? must he save? must we save? must you save? must they save?
Forma con V-ing
must I be saving? must you be saving? must he be saving? must we be saving? must you be saving? must they be saving?
Perfecto
must I have saved? must you have saved? must he have saved? must we have saved? must you have saved? must they have saved?
Perfecto con V-ing
must I have been saving? must you have been saving? must he have been saving? must we have been saving? must you have been saving? must they have been saving?
Forma interro-negativa
Forma simple
must I not save? must you not save? must he not save? must we not save? must you not save? must they not save?
Forma con V-ing
must I not be saving? must you not be saving? must he not be saving? must we not be saving? must you not be saving? must they not be saving?
Perfecto
must I not have saved? must you not have saved? must he not have saved? must we not have saved? must you not have saved? must they not have saved?
Perfecto con V-ing
must I not have been saving? must you not have been saving? must he not have been saving? must we not have been saving? must you not have been saving? must they not have been saving?