Rewrite each sentence using have to/ don't have to/mustn't. Don't change the meaning.
1. Never use a mobile phone at school!
2. There's no need for us to do it now.
3. It's illegal to cheat in exams.
4. It's a rule- students of our school wear uniforms.
5. It's your decision- do it if you want.
6. It's illegal to steal.
7. There's no need for you to stay.
8. It's your decision- read this book if you want.