What is the command?
Don't take pictures.
What is the command?
Turn off the TV.
What is the command?
Close your books.
What is the command?
Don't smoke.
What is the command?
Open your books.
What is the command?
Don't step/walk on the grass
What is the command?
Don't talk. Silence, please.
What is the command?
Don't open the door.