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