(-)_____your phone. (use)
Don't use
(+)
stand up
(-)
Don't sit down
(-)
Don't jump
(-)
Don't sing
(+)
open the window
(-) be late
Don't be late
(-) be sad
Don't be sad
(+) be careful
Be careful
(-)
Don't take photos (here).
(-)
Don't eat or drink (here).
