Odpowiedź:
1. I'm going to tell you a secret. You mustn't tell anyone!
2. Jack must be home before 11.30 p.m. on Friday nights.
3. You mustn't drop cans in the street. The police might fine you.
4. We mustn't forget Helen's birthday. It's next Tuesday.
5. Benny must work harder. He's going to fail his exams.
6. You must start each sentence with a capital letter.
7. You mustn't smoke in restaurants in the UK.
