I must screen you must screen she must screen we must screen you must screen they must screen
Forma con V-ing
I must be screening you must be screening she must be screening we must be screening you must be screening they must be screening
Perfecto
I must have screened you must have screened she 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 she 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 she 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 she 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 she 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 she 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 she screen? must we screen? must you screen? must they screen?
Forma con V-ing
must I be screening? must you be screening? must she be screening? must we be screening? must you be screening? must they be screening?
Perfecto
must I have screened? must you have screened? must she 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 she 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 she 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 she 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 she 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 she have been screening? mustn't we have been screening? mustn't you have been screening? mustn't they have been screening?