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