新编英语语法教程(第6版)第18讲 练习参考答案.doc

新编英语语法教程（第6版）第18讲 练习参考答案Ex. 18Aa)1. neednt (= dont have to, dont need to, havent got to)2. wont have to 3. didnt have to (= didnt need to) 4. neednt 5. didnt have to6. didnt have to 7. neednt 8. neednt 9. wont have to 10. needntb) 11. You had to 12. He wasnt to 13. He wasnt to 14. You had to15. He said I wasnt to 16. They had to 17. We had to 18. I wasnt to19. He said you werent to 20. We had toEx. 18B1. He may be doing his homework.2. She may have forgotten to call me back.3.Could you lend me 5 pounds until tomorrow?4. I wonder if I could leave now.5.It might rain this evening.6. Old Tom might have left San Diego.7. If it should rain tomorrow, the football match would be put off.8.You should do as he says.9.If you should change your mind, please let me know.10. Im surprised that he should have an accident.11. Shall I go with you?12. You shant answer her back again.13. You mustnt violate the traffic regulations again.14. He must have got lost in the mountains.15. You neednt go and see him.16. You neednt have written to her.17. You should have helped her.18. If you would change this car, I should be very grateful.19. Would you mind shutting the door?20. She shouldnt have bought that house.21. Its odd that she should say that.22. Dont call him. Hell be taking a nap.23. Dont write to him. He wont be home now.24. Dont bother him. He will have heard the news.25. A lion will attack people only when hungry.26. What will you do after graduation?27. Mary ought to be home by now.28. You oughtnt to have bought a new car.29. He used to work in Shanghai, but now he