大学英语第四版？《大学英语》（第四版）-刘洪波，《剑桥国际英语认证考试》（初级/中级/高级）-剑桥大学出版社，《英语语法新编》-周有光。1、《大学英语》是比较基础的教材，适合初学者使用。2、《剑桥国际英语认证考试》是一些考试的参考书目，适合准备考试的学习者使用。3、《英语语法新编》是英语语言学的参考书目，那么，大学英语第四版？一起来了解一下吧。
不大。新视野大学英语读写教程1第三版和第四版都是由郑树棠教授担任主编，每个单元的标题都没改变，只是课后习题有所改动，所以其差别并不大。
《新世纪大学英语系列教材（第二版）综合教程4.pdf》
https://72k.us/file/16273814-430748935（选择普通下载即可！）
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作业帮，是由百度知道特别为中小学生打造的，作业问答和话题交流的平台，是百度自己开发的东西。不过作业还是自己做吧，如果实在有不会的先问老师吧。
《大学英语》（第四版）-刘洪波，《剑桥国际英语认证考试》（初级/中级/高级）-剑桥大学出版社，《英语语法新编》-周有光。
1、《大学英语》是比较基础的教材，适合初学者使用。
2、《剑桥国际英语认证考试》是一些考试的参考书目，适合准备考试的学习者使用。
3、《英语语法新编》是英语语言学的参考书目，适合对语言学知识有一定了解的学习者使用。
新编英语语法教程 第21讲 练习参考答案
1. going
2. to murder
3. putting
4. to explain, to understand, to say
5. going
6. wondering, going
7. being
8. biting
9. going, to appreciate, to start
10. working, spending 11. to learn, saying 12. to put, to prevent, climbing 13. seeing 14. telling 15. staying 16. being 17. getting 18. to build 19. wanting, to help 20. doing 21. paying 22. needing 23. waiting 24. to understand 25. writing 26. pooh-poohing 27. having seen 28. seeing 29. writing 30. correcting 31. flying, to come, to go, go, flying 32. shopping 33. making 34. to take 35. selling 36. to eat, trying 37. calling, letting, decide 38. travelling, standing / to stand, queuing, waiting, to go 39. keeping, to fill, asking, to keep, making 40. smoking, to risk, setting, smokeEx. 21B1. to solve 2. to meet 3. receiving / having received 4. seeing / having seen 5. him / his saying / having said 6. to have 7. to close down 8. receiving / having received 9. to be 10. not to understand 11. my trying 12. actually promising 13. the Government setting up 14. there being 15. to resign 16. to do 17. being 18. never to follow 19. to look into 20. to know 21. his being 22. him / his ever agreeing 23. having made 24. to have read 25. putting people out of workEx. 21C1. into believing 2. from going 3. into obeying 4. out of telling 5. into admitting 6. into giving up 7. into doing 8. out of marrying 9. from having to 10. from speaking 11. from doing 12. from going 13. into doing 14. into giving 15. into thinking 16. into believing 17. into accepting 18. from losing 19. about leaving 20. from attending 21. on making22. of driving 23. against keeping 24. into taking 25. into buying 26. from being 27. from giving 28. from attending29. into buying 30. to travelling 31. from being burnt 32. about starting 33. for playing 34. with obstructing 35. of obstructing 36. for having 37. into paying 38. out of going 39. from taking 40. from taking upEx. 21D1. spending, earning 2. smoking 3. hitting 4. to do / doing 5. to be looked into 6. watching 7. taking 8. putting 9. lying / to lie, staring / to stare 10. to help, (to) prepare, holding 11. telling 12. to double / doubling 13. to get 14. to understand 15. to remind, watering / to be watered 16. being, to apologize 17. working, to age, lose 18. hearing, say, cutting / to be cut 19. cooking, washing, sweeping, cleaning 20. to risk, getting 21. to drink 22. working 23. acting, to see, wearing, reciting 24. trying, to make 25. pressing / to be pressed 26. to give 27. to mention 28. to tell 29. to wait, deciding, to accept 30. arriving 31. to think 32. practising 33. knitting34. pretending 35. being, attempting, to learn, skiing 36. spelling, being 37. your wanting, to help, to practise, doing 38. my saying, giving, to spell 39. allowing, to play, asking 40. him to start, takingEx. 21E1. a. He ought to be shot first.b. He deserves to be the first who will shoot.2. a. That boy ought to be watched.b. That boy wants to see what is happening.3. a. I paid the bill, and remember having done so.b. I remembered that I had to pay the bill, so I paid it.4. a. The man experimented by turing the key another way. b. The man made an attempt to turn the key another way.5. a. I told you that David stole the money and regret having done so.b. I have to tell you that David stole the money, and I’m sorry I must do so. 6. a. When did they stop working?b. When did they leave some place in order to work.7. a. I put it there, but I’ve quite forgotten what I did.b. It hasn’t occurred to me that I should put it there.8. a. I cannot but apologize. b. I can’t help him to apologize for his wrong doing. 9. a. We won’t build the dam any longer.b. We’ll stop something else and begin to build the dam.10.a. The meaning of revolution is the liberation of the prod (baidu.com)
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