1. Teenagers should have the freedom to decide what they want. 2. You shouldn’t listen to advice from people you don’t know.3. My parents must knock before coming into into my room. 4. He couldn’t use a computer when he was young.5. You mustn’t believe everything you hear.6. Could I borrow your computer to do my school project?7. I can't hear very well, so you must shout!8. You have to do the washing up today.