I must screen you must screen he must screen we must screen you must screen they must screen
Forme en 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
Perfect
I must have screened you must have screened he must have screened we must have screened you must have screened they must have screened
Perfect en 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
Négation
Forme simple
I must not screen you must not screen he must not screen we must not screen you must not screen they must not screen
Forme en V-ing
I must not be screening you must not be screening he must not be screening we must not be screening you must not be screening they must not be screening
Perfect
I must not have screened you must not have screened he must not have screened we must not have screened you must not have screened they must not have screened
Perfect en V-ing
I must not have been screening you must not have been screening he must not have been screening we must not have been screening you must not have been screening they must not have been screening
Forme interrogative
Forme simple
must I screen? must you screen? must he screen? must we screen? must you screen? must they screen?
Forme en 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?
Perfect
must I have screened? must you have screened? must he have screened? must we have screened? must you have screened? must they have screened?
Perfect en 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?
Forme interro-négative
Forme simple
must I not screen? must you not screen? must he not screen? must we not screen? must you not screen? must they not screen?
Forme en V-ing
must I not be screening? must you not be screening? must he not be screening? must we not be screening? must you not be screening? must they not be screening?
Perfect
must I not have screened? must you not have screened? must he not have screened? must we not have screened? must you not have screened? must they not have screened?
Perfect en V-ing
must I not have been screening? must you not have been screening? must he not have been screening? must we not have been screening? must you not have been screening? must they not have been screening?