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16. Express the prohibition with mustn't and lack of necessity with don't (doesn't) have to.

Examples: It is unnecessary for him to stay late at the lab. He doesn't have to stay late at the lab.
He is not allowed to be late for work. He mustn't be late for work.

1. It is unnecessary for him to show all these slides.
2. You are not allowed to miss the seminars.
3. It is unnecessary for this man to say who he is.
4. He is not allowed to speak sitting down.
5. You are not allowed to speak Russian in class.
6. It is unnecessary for you to do this exercise written.
7. It is unnecessary for her to do this work alone.
8. It is unnecessary for him to answer my question.

1. He doesn't have to show all these slides.2. You mustn't miss the seminars.3. This man doesn't have to say who he is.4. He mustn't speak sitting down.5. You mustn't speak Russian in class.6. You don't have to do this exercise written.7. She doesn't have to do this work alone.8. He doesn't have to answer my question.