1. Students musn't copy their friends' homework. It is prohibited.
2. Sara don't have to go shopping this afternoon, because her mum has already done it.
3. We can't go to school today. It's Sunday.
4. I should eat more fruit and vegetables. That's good for me.
5. Emily had to buy a new pair of glasses yesterday, because she lost her old one.
6. Could I have a glass of orange juice?
7. You don't have to print the document for me. I've already got a copy.
8. You musn't park here. It's prohibited.
9. Can I ask a question, please?
10. You should take a computer course if you don't know how to use your laptop.