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