Impossible as it seemed, I knew then that our only hope lay down that dark alley. Karen sees a police car and heads towards it. For example: Elizabeth, aged 55, mother of Jean Bill, a plumber Any characters who come into a scene after the start of it should be introduced by 'Enter'.
Karen sees the police officer and freezes in fear. Lastly, you need to write. In the lower right-hand corner, put your name, address, phone number and email address. And I'm hungry. This is called "off-screen" and is abbreviated "O.