1. We don't serve couscous here.
Couscous

      2. They didn't understand the message.
The message

      3. They are not downloading the file.
The file

      4. Nobody has found the missing dog yet.
The missing dog

      5. They won't talk to her anymore.
She

      6. They would never answer your questions.
Your questions

      7. We cannot trust him.
He

      8. They won't have given me anything by that time.
I

      9. No one has ever replaced those tyres.
Those tyres

      10. They needn't pay the bills soon.
The bills

      11. Nobody had asked us.
We

      12. They didn't do anything to solve the problem.
Nothing

      13. You oughtn't to do the quiz if you understood the lesson.
The quiz

      14. Nobody was looking at her.
She

      15. Nobody has contacted the managers.
The managers