Ответ:

  1. She ’s chatting to her friends online. В chat конечная согласная удваивается перед -ing.
  2. He is preparing his history presentation. У prepare конечная e опускается.
  3. We are waiting for the school bus.
  4. He is making a video about skateboarders. У make конечная e опускается.
  5. They aren’t crying; they are laughing.
  6. I ’m not watching anything; I ’m working!

Ответ: ’s chatting; is preparing; are waiting; is making; aren’t crying; are laughing; ’m not watching; ’m working.