1. Don't be in hurry, Bob. Pete must chew the food well. 2. do we have to send the parcel today, Must we sent a parcel today? We must have sent it yesterday. 3. If you want to have healthy teeth, you must use dental floss. 4. You mustn't bother Kitty. She is preparing for the exam. 5. If you cannot have children, you must adopt a child. This will save your marriage. 6. Children mustn't tell lies, Peter. It's very naughty. 7. You mustn't bite your nails. 8. You mustn't tell anyone about what I told you. Keep it secret. 9. You mustn't go out with such a guy. But why? Explain it to me, why? 10. We must weigh up all the pros and cons. This is very risky. Yes, I think, we must find new way to cope. 11. Evil must be punished. 12. do we have to leave so soon, Must we leave so soon. Don't be such a killjoy! 13. You mustn't open the present until Christmas Day. It may be a fluffy toy. Tell me, mom. I cannot wait. 14. do i have to do it immediately, must I do it immediately? No, we still have plenty of time.