Ответ:

  1. I was sitting on the sofa when it started to snow.
  2. Who were you talking to at the gate?
  3. We were cleaning the garage when you called.
  4. What was Stephen laughing about?
  5. I wasn’t listening, so I don’t know what to do now.
  6. What film was Claudia watching with her parents?
  7. My brothers weren’t feeling very well, so they stayed at home.