1、连接代词：who, whose, whom, what, which。有词义，在从句中担任成分，如主语、表语、 宾语、或定语等。 2、连接副词：whe
n, where, why, how。有词义，在从句中担任成分，作状语。 3、 连接词： that, whether, if, as if。 that 无词义， 在从句中不担任成分， 有时可省略； (whether), if as if 虽有词义，但在从句中不担任成分。 注意：连接代词与连接副词在句中不再是疑问句，因而从句中谓语不用疑问式。连接代词与 连接副词在从句充当句子成分，连接词 whether 和 if（是否） ，as if（好象）在从句中不充当句子成 分，只起连接作用。根据句义，如果连接代词与连接副词，whether、if 和 as if 都用不上时，才用 that 作连接词（that 本身无任何含义） 。
④介词后的宾语从句要用 whether 引导。 whether 可与不定式连用。 whether 也可引导主语从句、 表语从句、同位语从句，还可引导让步状语从句，以上均不能换成 if。但引导条件从句时，只能用 if，而不能用 whether。 e.g. It depends on whether we have enough time. They don’t know whether to go there. Please come to see me if you have time.
同位语从句在句中作某一名词的同位语，一般位于该名词（如：news, fact, idea, suggestion, promise 等）之后，说明该名词的具体内容。 e.g. I have no idea when he will be back. The fact that he had not said anything surprised everybody.
1. China is no longer what it used to be. 2. The truth that the earth turn around the sun is known to all. 3. It was snowing when he arrived at the station. 4. How he persuaded the manager to change the plan is interesting to us all. 5. The news that they had won the game soon spread over the whole school. 6. The news that you told me yesterday was really disappointing. 7. That is where Lu Xun used to live. 8. He spoke as if he understood what he was talking about. 9. Do you remember the teacher who taught us English at middle school? 10. I wonder why she refused my invitation.
1、主语从句在复合句作主语。 e.g. Who will go is not important. 2、用 it 作形式主语，主语从句放在句末。 e.g. It doesn’t matter so much whether you will come or not. 3、that 引导主语从句时，不能省略。 e.g. That he suddenly fell ill last week made us surprised.
1、表语从句在复合句中作表语，位于系动词之后。 e.g. The question was who could go there. 2、引导表语从句的连接词 that 有时可省去。 e.g. My idea is (that) we can get more comrades to help in the work.
1. I can’t decide ____________ dictionary I should buy. 2. That’s ____________ he refused my invitation. 3. I am very interested in ____________ he has improved his pronunciation in such a short time. 4. ____________ we need is more time. 5. The fact ____________ she had not said anything at the meeting surprised everybody. 6. ____________ and ____________ they will meet has not been decided yet. 7. Please tell me ____________ you are waiting for. 8. Is that ____________ you are looking for? 9. Would you please tell me ____________ the nearest post office is? 10. I don’t know ____________ he will agree to the plan or not. 1.（安徽高考，27）The limits of a person’s intelligence, generally speaking, are fixed at birth, but _____ he reaches these limits will depend on his environment. A. where B. whether C. that D. why 2.（浙江高考，4）I made a promise _____ this year, my first in high school, would be different. A. whether B. what C. that D. how
1、宾语从句在复合句中作宾语。引导宾语从句的连词 that 一般可省略。 e.g. I hope (that) everything is all right. 2、介词之后的宾语从句，不可用 which 或 if 连接，要分别用 what 或 whether。 e.g. I’m interested in whether you’ve finished the work.. I’m interested in what you’ve said. 3、whether 与 if 都可以引导宾语从句，常可互换。但下面情况不能互换。 ①宾语从句是否定句时，只用 if，不用 whether。 e.g. I wonder if it doesn’t rain. ②用 if 会引起误解，就要用 whether。 e.g. Please let me know whether you want to go.（此句如果把 whether 改成 if，容易当成条件句理 解） ③宾语从句中的 whether 与 or not 直接连用，就不能换成 if；不直接连用，可换。 e.g. I don’t know whether or not the report is true. I don’t know whether/ if the report is true or not.
3.（全国高考 I，24）It is by no means clear _____ the president can do to end the strike. A. how B. which C. that D. what 4.（上海高考，40）The map is one of the best tools a man has _ _ he goes to a new place. A. whenever B. whatever C. wherever D. however 5.（重庆高考，34）Evidence has been found through years of study _____ children’s early sleeping problems are likely to continue when they grow up. A. why B. how C. whether D. that 6. （湖南高考， Everyone in the village is very friendly. It doesn’t matter _____ you have lived there for 26） a short or a long time. A. why B. how C. whether D. when 7. （福建高考， We promise _____ attends the party a chance to have a photo taken with the movie star. 35） A. who B. whom C. whoever D. whomever 8.（北京高考，24）Jerry did not regret giving the comment but felt _____ he could have expressed it differently. A. why B. how C. that D. whether 9. （天津高考， It doesn’t matter _____ you turn right or left at the crossing—both roads lead to the park. 9） A. whether B. how C. if D. when 10.（江西高考，25）It suddenly occurred to him _____ he had left his keys in the office. A. whether B. where C. which D. that 11. （陕西高考， As many as five courses are provided, and you are free to choose _____ suits you best. 20） A. whatever B whichever C. whenever D. wherever 12.（四川高考，17）Scientists study _____ human brains work to make computers. A. when B. how C. that D. whether A. will do B. had done C. do D. did（模块四第 3 单元 task） 13. 辽宁高考， （ 34） The newcomer went to the library the other day and searched for _____ he could find about Mark Twain. A. wherever B. however C. whatever D. whichever 14． （山东高考，21）Whenever you are done with the book, just give it to Lucy or Helen or _____. A. whoever B. wherever C. whatever D. however 15.（山东高考，25）It doesn’t matter _____ you pay by cash or credit card in this store. A. how B. whether C. what D. why 16. 江苏高考， （ 27） The notice came around two in the afternoon _____ the meeting would be postponed. A. when B. that C. whether D. how 17.（上海高考，34）There is much truth in the idea kindness is usually served by frankness. A. why B. which C. that D. whether 18.（上海高考，38）—We've only got this small bookcase. Will that do? —No, _ _ I am looking for is something much bigger and stronger. A. who B. that C. what D. which 19. He was never satisfied with _____.
A. what she had achieved B. had what she achieved C. she had achieved D. that she achieved 20. These photographs will show you _____. A. what does our village look like B. what our village looks like C. how does our village look like D. how our village looks like 21. Peter insisted _____ he pay the bill. A. on that B. what C. that D. on which 22. They urged _____ the library open during the vacation. A. when B. where C. why D. that 23. We wish we could have learned _____ when we were at high school. A. what you did B. that you had done C. that what you did D. what did you do 24.1 will describe to you _____ I saw when there. A. what B. that C. which D./ 25. From _____ I should say he is a good worker. A. what 1 know of him B. that I do know of him C. what do I know of him D. that do I know of him 26. I will give this dictionary to __ wants to have it. A. whomever B. anyone C. whoever D. someone 27._____ they will come here hasn' t been decided yet. A. What B. That C. When D. Where 28. _____ was said here must be kept secret. A. Who B. The thing C. Whatever D. Where 29. It is still a question _____ we shall have our sports meet. A. if B. that C. what D. when 30. I'm going anyway. _____ she will go is up to her to decide. A. If or not B. Whether or not C. If D. That 31. It is strange _____ she have left without saying a word. A. that B. what C. why D. how 32. It is very clear _____ our policy is a correct one. A. what B. that C. why D. where 33. _____ Mr Zhang said is quite right. A. That B. When C. What D. Whether 34. It has been decided _____ he will be sent there. A. if B. whether C. why D. that 35. It doesn' t matter _____he' s come back or not. A. if B. whether C. that D. when
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