I must open you must open he must open we must open you must open they must open
Forma com 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
Perfeito
I must have opened you must have opened he must have opened we must have opened you must have opened they must have opened
Perfeito com 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
Negação
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 com 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
Perfeito
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
Perfeito com 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 com 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?
Perfeito
must I have opened? must you have opened? must he have opened? must we have opened? must you have opened? must they have opened?
Perfeito com 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-Negação
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 com 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?
Perfeito
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?
Perfeito com 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?