giải giúp em ạ 1. He has difficulty in making friends at his school.  He finds it 2. He said, “Don’t buy this book if you don’t like it”  He 3. Keep quiet or I’ll scream.  Unless 4. I don’t have a map, so I can’t direct you. If 5. “Think well before you answer my questions today, Mary” , the teacher said  The teacher 6. I can't take much exercise because I don't have enough free time. à If 7. “Are you angry with me?” she said to Peter. She 8. Be careful when you do your test this morning,” the teacher said to us. The teacher 9. I regret not finishing my homework at the weekend. I wish 10. Be careful or you’ll cut yourself with that knife. à Unless ………………………/ If 11. I’m sorry I will leave here tomorrow. à I wish 12. “Why do you have to do this work now?” she said to me.She 13. They can’t sell their products in this country  Their 14. A neighbor is looking after the children.  The children 15. My son always writes words on the wall. à Words 16. What a pity Peter didn’t tell you the truth yesterday.  I wish 17. Hurry up or you will miss the train.  If 18. It rains today, that’s why John stays at home.  If 19. Mary said to John, “I can’t go to the movie with you tomorrow.” à Mary 20. Mary never gets bad marks because she studies hard à If