EXTENSIONS are the little abbreviations that occasionally follow the character name. There are only three extensions commonly used: (V.O.), for "voiceover," which indicates that the person talking is not really in this scene, usually because he's a narrator, telling the story from a point after the story takes place; (O.S.) for "off screen," which means the character is physically present in the scene but he's off camera as he speaks; and (CONT'D), which means that a character is speaking twice in a row in the same scene, interrupted by action but not by another character talking. Extensions appear in parentheses directly following the character name, on the same line. Descriptions like "angry" and "on the telephone" and "shouting" aren't Extensions, they're Parentheticals, and go on a separate line.