I may screen you may screen he may screen we may screen you may screen they may screen
V-ing form
I may be screening you may be screening he may be screening we may be screening you may be screening they may be screening
Perfect
I may have screened you may have screened he may have screened we may have screened you may have screened they may have screened
V-ing perfect
I may have been screening you may have been screening he may have been screening we may have been screening you may have been screening they may have been screening
Negation
Simple form
I mayn't screen you mayn't screen he mayn't screen we mayn't screen you mayn't screen they mayn't screen
V-ing form
I mayn't be screening you mayn't be screening he mayn't be screening we mayn't be screening you mayn't be screening they mayn't be screening
Perfect
I mayn't have screened you mayn't have screened he mayn't have screened we mayn't have screened you mayn't have screened they mayn't have screened
V-ing perfect
I mayn't have been screening you mayn't have been screening he mayn't have been screening we mayn't have been screening you mayn't have been screening they mayn't have been screening
Interrogative form
Simple form
may I screen? may you screen? may he screen? may we screen? may you screen? may they screen?
V-ing form
may I be screening? may you be screening? may he be screening? may we be screening? may you be screening? may they be screening?
Perfect
may I have screened? may you have screened? may he have screened? may we have screened? may you have screened? may they have screened?
V-ing perfect
may I have been screening? may you have been screening? may he have been screening? may we have been screening? may you have been screening? may they have been screening?
Interro-negative form
Simple form
mayn't I screen? mayn't you screen? mayn't he screen? mayn't we screen? mayn't you screen? mayn't they screen?
V-ing form
mayn't I be screening? mayn't you be screening? mayn't he be screening? mayn't we be screening? mayn't you be screening? mayn't they be screening?
Perfect
mayn't I have screened? mayn't you have screened? mayn't he have screened? mayn't we have screened? mayn't you have screened? mayn't they have screened?
V-ing perfect
mayn't I have been screening? mayn't you have been screening? mayn't he have been screening? mayn't we have been screening? mayn't you have been screening? mayn't they have been screening?