I must surname you must surname he must surname we must surname you must surname they must surname
Forma con V-ing
I must be surnaming you must be surnaming he must be surnaming we must be surnaming you must be surnaming they must be surnaming
Perfecto
I must have surnamed you must have surnamed he must have surnamed we must have surnamed you must have surnamed they must have surnamed
Perfecto con V-ing
I must have been surnaming you must have been surnaming he must have been surnaming we must have been surnaming you must have been surnaming they must have been surnaming
Negación
Forma simple
I mustn't surname you mustn't surname he mustn't surname we mustn't surname you mustn't surname they mustn't surname
Forma con V-ing
I mustn't be surnaming you mustn't be surnaming he mustn't be surnaming we mustn't be surnaming you mustn't be surnaming they mustn't be surnaming
Perfecto
I mustn't have surnamed you mustn't have surnamed he mustn't have surnamed we mustn't have surnamed you mustn't have surnamed they mustn't have surnamed
Perfecto con V-ing
I mustn't have been surnaming you mustn't have been surnaming he mustn't have been surnaming we mustn't have been surnaming you mustn't have been surnaming they mustn't have been surnaming
Forma interrogativa
Forma simple
must I surname? must you surname? must he surname? must we surname? must you surname? must they surname?
Forma con V-ing
must I be surnaming? must you be surnaming? must he be surnaming? must we be surnaming? must you be surnaming? must they be surnaming?
Perfecto
must I have surnamed? must you have surnamed? must he have surnamed? must we have surnamed? must you have surnamed? must they have surnamed?
Perfecto con V-ing
must I have been surnaming? must you have been surnaming? must he have been surnaming? must we have been surnaming? must you have been surnaming? must they have been surnaming?
Forma interro-negativa
Forma simple
mustn't I surname? mustn't you surname? mustn't he surname? mustn't we surname? mustn't you surname? mustn't they surname?
Forma con V-ing
mustn't I be surnaming? mustn't you be surnaming? mustn't he be surnaming? mustn't we be surnaming? mustn't you be surnaming? mustn't they be surnaming?
Perfecto
mustn't I have surnamed? mustn't you have surnamed? mustn't he have surnamed? mustn't we have surnamed? mustn't you have surnamed? mustn't they have surnamed?
Perfecto con V-ing
mustn't I have been surnaming? mustn't you have been surnaming? mustn't he have been surnaming? mustn't we have been surnaming? mustn't you have been surnaming? mustn't they have been surnaming?