名词性从句总复习
一、名词性从句的意义和种类
在句中相当于一个名词作用的从句叫名词性从句。由于名词通常在句中充当主语、宾语、表语和同位语，所以名词性从句也包括主语从句、宾语从句、表语从句合同位语从句。
二、引导名词性从句的关联词
从属连词：that, whether, if （纯连词，在从句中不充当任何成分）
疑问代词: what, which, who/whom/whose（在从句中充当成分：主语、宾语、定语等）
疑问副词: when, where, why, how，whenever, wherever等（在从句中充当状语）
复合关系代词：what, whoever, whomever, whosever，whichever (在从句中充当成分：主语、宾语、定语等)
另外，how + 形容词/副词也可引导名词性从句，如how old, how long, how soon, how far, how fast, how often等, which / what + 名次也可引导名词从句。
三、关联词的选用
1、从句中有何疑问就用相应的疑问词引导从句。
e.g. 她在那儿住)
(她是干什么的)
I don’t know (她多大年纪)
’t come yet.(她为什么还没来)
她在找谁)
she will come tomorrow.(她明天会不会来)
2、从句中无任何疑问时用that引导从句。
e.g. She promised that she would buy me a present for my birthday.
She said that she didn’t know the news.
3、从句中若含有“… …的东西，… …的事情，……的话; ……的”等则需用what引导从句。
e.g. 1)我收回我说的话。I take back what I said.
2）我在那里看见的与我听到的情况大不一样。
What I saw there was quite different from what I had heard.
最使我吃惊的是他赢得了一等奖。
What surprised me most was that he won the first prize . (what 作从句主语)
4、一个从句只能用一个引导词。找出下列从句中多余的引导词：
1）That whether you’ll succeed depends on how hard you work..
2) She asked me that why I was absent from class yesterday.
3) The giant made a promise that if anybody could set him free from the kettle he would
make him king of the earth.
5、no matter + 疑问词不能引导名词性从句，只能引导让步状语从句。
No matter who breaks the law must be punished. (错)
Whoever (=Anyone who) breaks the law must be punished. (对)
Her father loves her so much that he always gives her whatever she wants. (对)
Her father loves her so much that he always gives her no matter what she wants. (错)
Yao Ming is warmly welcomed wherever he goes. (对)
Yao Ming is warmly welcomed no matter where he goes. (对)
四、须注意的几点
1. if 不能引导主语从句、表语从句、同位语从句。
2. 主语是reason 的表语从句要用that 引导，而不用because。
e.g. The reason why he was absent is that he missed his flight.
3．动词doubt 用在疑问句或否定句时，其后宾语从句常用that 作连接词；用在肯定句时，连接词用whether 或if 皆可，而不用that。
Do you doubt that he will win ? 你难道怀疑他将取胜?
I don't doubt that your proposition is wrong . 我相信你的建议是错的。
He doubt whether I know it . 他怀疑我知道了此事。
4．在主语从句、表语从句和同位语从句中的that不可以省略。在宾语从句中的that 可以省略。
以下句子中，可省略that的有（）
1）It is certain that he will succeed.
2）My problem is that I am short of money.
3）They believe that he has left the city.
4）I am glad that you passed the exam.
但是，并列的第二个宾语从句的引导词that不能省略。例如：
5）She said (that) Mr Black was a strict but kind teacher and that they all loved and respected him.(第二个that 不能省略)
5．主语从句常可用It is…that句型改写。其中It是形式主语，that引导的从句才是真正的主语。
That the earth is round is true.
= It's ture that the earth is round.
6．无论名词性从句中有何疑问，它的语序永远为陈述语序。
Do you know when he will come back ? 知道他何时回来吗?
7．正确掌握名词性从句谓语动词的时态。这是学习和掌握名词性从句的难题之一，在名词性从句中重点是宾语从句谓语动词的时态。
A. 若主句谓语动词为一般现在时和一般将来时，宾语从句的动词可根据句意用它所需要的任何状态。
Will you tell me how you learned English well ?
告诉我你怎么学好英语的，好吗?
I think he'll be back in an hour .
我想一小时后他会来的。
B. 若主句谓语动词是过去时态时，从句中的动词须用过去的相应时态。
I thought they were having lessons .
我想他们正在上课。
She said she had done her homework .
她说她已做完了作业。
Mary said she would help me with my English .
玛丽说她将帮我学英语。
C. 宾语从句表达客观真理，不论主句是什么时态，从句都用一般现在时。
The teacher told us light travels faster than sound .
老师告诉我们光的速度比声音快。
8. 否定转移问题。在主句为第一人称主语后跟think , believe , suppose , expect , guess ,
imagine 等动词时，宾语从句的否定形式应转移到主句中。
We don't expect he will come tonight, will he ?
9. 名词性从句作主语时，主句的谓语动词用单数。但是如果有两个或两个以上的主语从句并列做主语，则位于用复数。
When you will go to pick the apples hasn't been decided.
Exercises: Choose the correct answer
1. This is _____I mean.
A. it
B. that
C. which
D. what
2. I asked him ____he would go.
A. what
B. that
C. whom
D. if
3. I know _____my teacher is right.
A. which
B. what
C. who
D. that
4. ____he is right is evident.
A. what
B. whom
C. That
D. If
5. I doubt ___it will rain this afternoon.
A. whether
B. that
C. what
D. about
6. I have no doubt ___he will help me this time.
A. if
B. that
C. whether
D. how
7. ____the earth is round is known to everybody
A. Then
B. That
C. This
D. Which
8. He told me the news ____our team had won the game
A. about
B. of
C. that
D. as
9. It makes no difference to me____he will come or not.
A. how
B. why
C. when
D. whether
10. ___is unknown to me.
A. Where he is
B. Where is he
C. He is where
D. Is he where
11. The subject of the sentence "What is interesting is that I do not even know him." is______.
A. what
B. interesting
C. what is interesting
D. I
12. He came here shortly before, so I can't know _____
A. he is good or not
B. if he is good
C. how is he
D. how did he .
13. ______? I think he is Charles Yang.
A. Who do you think he is
B. Do you think who he is
C. Whom do you think he is
D. Who you think he is
14. Do you remember where ____my watch?
A. had I put
B. have I put
C. I have put
D. do I put
15. The old man asked Henry_____England nest week.
A. whether will he go
B. whether would he go to
c. whether he is going to D. whether he would go to
16. The problem ____overworking all day long impairs his health.
A. is
B. that
C. which
D. is that
17. Jack asked me about myself and wanted to know____.
A. what had I studied English for
B. what did I study
英语名词性从句知识归纳 Prepared on 22 November 2020
名词性从句知识归纳 名词性从句是指在句子中相当于名词的从句，主要包括主语从句、宾语从句、表语从句和同位语从句。名词性从句不是修饰性从句，而是复合句中的主干。 . That the boy failed again in the exam disappointed his mother. （主语从句） I know that he is writing his composition in his room. （宾语从句） The question is how we can finish it on time. （表语从句） The fact that some Chinese are still poor is really a great problem. （同位语从句） 一、宾语从句---及物动词、介词、部分形容词（certain, sure, glad, afraid, frightened, happy, pleased, sad, sorry, surprised, upset, satisfied等）后. I believe (that) he is honest. (that不充当从句内的任何成分，一般情况可省略) I’m glad that you are satisfied with your job. (that不充当从句内的任何成分) He doesn’t care if/whether it isn’t a fine day. (if/whether不充当从句内的任何成分) Please tell me what you want. (what充当从句内的宾语)
中考专项训练名词性从句X知识点总结含答案解析 一、初中英语名词性从句 1．_______ you don't like him is none of my business. A. What B. Who C. That D. Whether 【答案】 C 【解析】【分析】句意：你不喜欢他，跟我没有什么关系。you don't like him为主语从句，其内容已经是完整的，所以用that，且引导主语从句的that不能省略。 2．While some behaviors may seem strange to you, remember you consider normal probably seems just as unusual to others. A. it; that B. what; that C. that; what D. which; that 【答案】 C 【解析】【分析】句意：虽然有些行为对你来说可能很奇怪，但请记住，你认为正常的行为对别人来说可能也不寻常。第一空为宾语从句，从句结构完整用that起连接作用，第二空为主语从句，从句中consider缺少宾语，应该用what，故选C。 【点评】考查名词性从句，本题涉及that引导的宾语从句和what引导的主语从句。 3．______excited Jenny most was ______ she finally succeeded in ______seemed to be the most difficult exam to him. A. That; that; which B. What; that; what C. That; because; that D. What; because; which 【答案】 B 【解析】【分析】句意：珍妮最兴奋的是对他来说似乎是最困难的考试，她终于成功了。______excited Jenny most是主语从句，从句中缺少主语，因此用关系代词what ；_____ she finally succeeded in ...是表语从句，从句中不缺少成分，因此用引导词that；______seemed to be the most difficult exam to him.是宾语从句，从句中缺少主语，因此用关系代词what ，故选B。 【点评】考查名词性从句，本题涉及主语从句，表语从句和宾语从句。 4．________ his failure lies is expected ________ clear to us. A. What… to make B. How… made C. Where… to be made D. Why… making 【答案】C 【解析】【分析】句意：他的失败之处有可能被我们弄清楚。分析句子可知，主语从句中的lie为不及物动词，所以主句中缺少状语，因此填where。expect sth.to do.固定短语，“期望某事发生”，sth. be expected to do.意为”某事有可能发生“。make sth. clear to sb为固定搭配，意为“向某人阐明某事，使某人弄清某事”。本句中make的宾语是where his failure lies 是被弄清楚，要用动词不定式的被动形式。因此选C。
名词性从句的解题技巧（二） 安徽省蚌埠二中----朱正军 B）名词性从句缺表语： 从句缺表语比上述情况复杂一些，根据句意分析，如果需要使用连接代词的话，判断选择的 方法与上述方法相同，而表达“谁的？”这一所属关系时则用whose (如：I don’t know whose this book is.)。如： 15. I read about it in some book or other. Does it matter ____ it was? 【北京卷2006】 A. were B. what C. how D. which 16. ----Can you do me a favor? ----It depends on ____ it is. 【北京卷2006】 A. which B. whichever C. what D. whatever 17. I want to be liked and loved for _____ I am inside. 【北京卷2010】 A. who B. where C. what D. how 18. Engines are to machines ____ hearts are to animals. 【山东卷2006】 A. as B. that C. what D. which 【这是一个较为特殊的句式结构，从句是第一个are的表语。句意为“发动机对于机器而言就 如同动物的心脏。”】 答案：15. D 16. C 17. C 18. C。选择方法上文已经讲过，在此不再赘述。 如果不能使用连接代词，则根据语义选择适当的连接副词，如Please tell me who/what/where/how he is一句中的几个连接词都是正确的，具体用哪一个要看上下文。 C）名词性从句缺定语： 名词性从句缺定语如果指“谁的？”则用whose，如：I don’t know whose book this is. 如果指“什么的？”则用what或whatever，如：I don’t care what person you’d like to make friends with.或You can make friends with whatever person you like. 再如： 19. It is uncertain_____ side effect the medicine will bring about although about two thousand patients have taken it. 【浙江卷2010】 A. that B. what C. how D. whether 该题表达的是“什么样的”，所以答案为B。 如果指“哪一个？”则用which或whichever。如： 20. ____ team wins on Saturday will go through to the national championships. 【山东卷2006】 A. No matter what B. No matter which C. whatever D. whichever 【谈及星期六的比赛，当然就有了范围的限制，所以要用which或whichever，意为“哪个队”，分析一下句型结构不难看出连接词既是team的定语，whichever team又是will go through的 主语，即“一身兼两职”。同时，No matter wh+只能引导让步状语从句。】 答案：20. D。which与whichever之间语法上的区别和who与whoever whom与whomever相同，whichever可解释为any person who/any thing which。 二）如果名词性从句中不缺少上述成分，则根据句意有无疑问将连接词的选择分成两种情况：A）从句语义是确定无疑的： a) 从句表达的是“一种事实”则用that。 1. It never occurred to me ____ you could succeed in persuading him to change. 【陕西卷2010】 A. which B. what C. that D. if
名词性从句在写作中的运用 一用名词性从句连接下句子: 1.Two thirds of all girls in Britain are on a diet. It worries their parents and teachers a lot. The fact that _________________________________________________（同位语从句） 2.Mr. Smith said a lot on how to learn English. His words gave us a lot of help. What Mr. Smith said _________________________________________________(主语从句) 二用不同的表达完成句子: (1) 众所周知，昨天是汶川地震三周纪念 ①You all know that it was the third anniversary of the Wenchuan earthquake yesterday. =I think it known to you all ________________________________________________ =That it was the third ________________________________________________ =It is known to you all that ________________________________________________ =The fact that ________________________________________________
名词性从句 名词性从句相当于名词，可分别作主句的主语、表语、宾语和同位语。因此，名词性从句厅分为主语从句、表语从句、宾语从句和同位从句。 （一）引导名词性从句的连接词 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：when, 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；if (whether), as if虽有词义，但在从句中不担任成分。 注意： 1、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）。 2、不可省略的连词： （1）介词后的连词 （2）引导主语从句和同位语从句的连词不可省略。 That she was chosen made us very happy. We heard the news that our team had won. （二）主语从句 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. 主要句型有： （1）It+be+形容词+that从句。 It is probable that he told her everything. 很可能他把一切都告诉她了。 （2）It+be+名词词组(no wonder, an honour, a good thing, a pity, no surprise, etc.)+that从句。It’s no surprise that our team should have won the game. 我们没赢这场比赛真意外。 （3）It+be+过去分词+that从句。 It is said that Mr. Green has arrived in Beijing. 据说格林先生已经到了北京。 （4）It+seem, happen等不及物动词及短语+that从句。 It seems that Alice is not coming to the party at all. Alice似乎不来参加晚会。 （5）It+doesn’t matter (makes no difference, etc.)+连接代词或连接副词引起的主语从句。 It doesn’t matter whether she will come or not. 她是否来这无关紧要。 It makes no difference where we shall have the meeting. 我们在哪里开会毫无区别。 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. 4、当主语从句作主语时，谓语动词一般用第三人称单数，下面这个句型例外。 What we need is more time and money. What we need are many more books. 5、if不能用在主语从句中，而是用whether Whether he left (or not) is unknown 6、引导主语从句的关联词有三类： (1)从属连词that。
【考点五】语法考点归纳5（定语从句、名词性从句） 定语从句考点归纳 1．高考对定语从句的考查集中体现在关系词的选择上，包括关系代词和关系副词。关系代词只有6个，即：that，which，who，whom，whose，as，关系副词只有3个，即：when，where，why。 2．选择关系代词和关系副词的方法：由于关系词既有连接作用又有替代作用和成分作用（引导定语从句并在从句中替代先行项/词而且还充当一定的成分），所以在选择关系词时有一个很简单的方法。把先行项/词还原到从句中，看看该用什么关系词来替代。例如： I visited a scientist ______ name is known all over the country. 把先行词a scientist还原到从句中就是：the scientist’s name is known all over the country 可见从句中缺定语，这里该填whose。又如：The school _____ I studied for only two years was three kilometers away. 把先行词the school还原到从句中就构成这样一个简单句：I studied for two years in the school. “in the school”是一个表示地点的介词短语，在从句中作状语，要用where（=in which）来替代。 3．注意关系代词as和which引导非限定性定语从句的区别：as引导的非限定性定语从句可以置于句首，而which 引导的非限定性定语从句只能位于句中或句尾。 4．注意掌握只用关系代替that、只用关系代词which的常见的几种情况，以及“介词+关系代词”引导的定语从句。 考点精析 1.关系代词引导的定语从句 关系代词所代替的先行词是人或物的名词或代词, 并在句中充当主语, 宾语, 定语等成分. 关系代词在定语从句中作主语时, 从句谓语动词的人称和数要和先行词保持一致. (1)Who, whom, that这些词代替的先行词是人的名词或代词, 在从句中所起的作用如下: Is he the man who/that wants to see you 他就是你想见的人吗(who/that在从句中作主语) Hs is the man whom/that I saw yesterday. 他就是我昨天见的那个人.(whom/that在从句中作宾语) (2)whose用来指人或物, 只用作定语, 若指物, 它还可以同of which.互换. 例如: They rushed over to help the man shoes car had broken down. 那人的车坏了, 大家都跑过去帮忙 Please pass me the book whose (of which) cover is green. 请递给我那本绿皮的. (3)Which, that它们所代替的先行词是指代事物的名词或代词, 在从句中可作主语, 宾语等. 例如: A prosperity which/that had never been seen before appears in the countryside. 农村出现了前所未有的繁荣. (Which/that在句中作宾语) The package (which/that) you are carrying is about to come unwrapped. 你拿的包快散了(which/that在句中作宾语) 2.关系副词引导的定语从句 关系副词可代替的先行词是时间. 地点或理由的名词, 在从句中作状语. (1). When, there, why 关系副词when, where, why的含义相当于“介词+which”结构, 因此常常和“介词+which”结构交替使用. 例如: There are occasions when (on which) one must yield.
（二）名词性从句 一、填入适当的引导词 1. ---Could you tell me ________ the man is ? --- He is my brother. 2. I didn’t know ________ he was coming until yesterday . 3. ---It’s still a question _______ we shall have our sports . --- It’s said we shall have it next week . 4. The news ________ he was chosen made us happy . 5. The doctor asked ________ medicine you have taken . 6. This is ________ they solved the problems in the city . 7. ________ our football team will win is uncertain yet . 8. ________ frightened us most was ________ two lights appeared suddenly in the darkness . 9. My mother asked _______ was the matter with me . 10. The reason I didn’t come to the meeting was _______ I got ill . 二、单项选择 ( ) 1. The mason why he didn't come to the meeting was_________ he was ill. A. because B. because of C. that D. which ( ) 2. I don't know_________is_________I was born. A. that, why B. that, what C. that, where D. what, that ( ) 3. _________we need more time and effort is quite clear. A. When B. what C. That D. / ( ) 4. _____ he will start off to Nanjing isn't known to us. A. That B. Which C. Because D. When ( ) 5. _________she put the key is unknown to me. A. How B. Where C. In which D. Whether ( ) 6. I don’t understand is_________he has changed his mind. A. That, that B. Which, how C. What, what D. What, why ( ) 7. His suggestion is_________the food_________under low temperature. A. that, be kept B. that, would be kept C. What, should be kept D. that, keep ( ) 8. The news ______ Lincoln was murdered filled their heart with deep sorrow. A. which B. that C. about that D. in which ( ) 9. It makes no difference ______ he come or not. A. if B. that C. when D. whether ( ) 10. _________she has done astonishes everybody in the school. A. How B. Where C. In which D. The behaviour ( ) 11. _________ I was out when a friend came to see me that day. A. It is happened that B. It happened that C. It happened to D. That happened ( ) 12.They required that he_________at 6:30 am. A. arrived B. would arrive C. should arrive D. arriving ( ) 13. The retired teacher often thinks of_________ he can do more for the education. A. which B. how C. what D. that ( ) 14. I don’t think_________ . A. that he has finished his studies in such a short time possible B. possible that he has finished his studies in such a short time C. it that he has finished his studies in such a short time possible D. it possible that he has finished his studies in such a short time ( ) 15. The doctors did ______ they could the wounded man. A. that, save B. what, save C. and, save D. what, to save ( ) 16. Do you know _________to build bridge? A. how long it was taken B. how long it had taken C. how much time did it taken D. how much time it was taken ( ) 17. I don’t know_________he has bought these books. A. for whom B. to whom C. who D. whom ( ) 18. Take_________ you really like here. A. however B. whatever C. whenever D. wherever ( ) 19. _________do you think will give us a talk? A. Which B. What C. Who D.Whom ( ) 20. _____ he didn't come yesterday is strange. A. Which B. That C. It that D. Why ( ) 21. Tell me how much_________ . A. did the dictionary cost B. cost the dictionary C. the dictionary cost D. the dictionary costed ( ) 22. I doubt_________they will help us with it at once. A. whether B. that C. what D. / ( ) 23.How I wish I_________ last week's party. A. had been able to go to B. could go to C. were able to go to D. went to ( ) 24. It was just ______ she studied hard that he passed the exam. A. since B. for C. as D. became ( ) 25. _________has done it should be criticized. A. No matter who B. Who C. Whoever D. Anyone ( ) 26. Have you any idea ? A. how soon they will arrive B. how fast will they arrive C. how quick they will arrive D. how will they arrive ( ) 27. Air is to us ______ water is to fish. A. is that B. What C. Which D. that ( ) 28. Is it possible_________he misunderstood_________I said. A. that, that B. what, what C. what, that D. that, what ( ) 29. My hometown is no longer_________. A. what it used to be B. what is used to like C. like it used to be D. what is used to ( ) 30. He didn't know_________with the computer. A. what was the matter B. what the matter was C. what matter was it D. what wrong was 三、单句改错 1. We all agree with him on that he said. _________________ 2. Can you tell me where he lives in? _________________ 3. The fact he was seriously ill made them worded. _________________ 4. The problem is we are short of money. _________________ 5. Things were not that they seemed to be. _________________ 6. You don't like him is none of my business. _________________ 7. She said she will stay here for another week. _________________ 8. I will give this dictionary to whomever wants to have it. _________________ 9. The old man's sons wanted to know was where the gold had been hidden. ________________ 10. The news which we would go to Mount Tai during the winter vacation delighted us. ________________
名词性从句在写作中 的运用
名词性从句在写作中的运用 用名词性从句连接一下句子： Two thirds of all girls in Britain are on a diet. It worries their parents and teachers a lot. _____________________________________________________________________ _____________________________________________________________________ ____________________ ?The fact that two thirds of all girls in Britain are on a diet worries their parents and teachers a lot. Time travel is possible. There is no scientific proof for the idea. _____________________________________________________________________ _____________________________________________________________________ ____________________ ·There is no scientific proof for the idea that time travel is possible. Mr. Smith said a lot on how to learn English. His words gave us a lot of help. _____________________________________________________________________ _____________________________________________________________________ ____________________ ?What Mr. Smith said on how to learn English gave us a lot of help. The winner will get the big prize. The result of the game will be unfolded tonight. _____________________________________________________________________ _____________________________________________________________________ ____________________ ·Whoever wins the game will get the big prize. 用不同的表达完成句子： （1）众所周知，昨天是汶川地震三周纪念日。 _____________________________________________________________________ _____________________________________________________________________ ____________________
名词性从句 一、定义：名词性从句在功能上相当于名词，是一个句子分别充当另一个句子的主语、表语、宾语和同位语，由此被称为主语从句，表语从句，宾语从句和同位语从句。 辨别下列从句属于哪种名词性从句并分析： 1）Why they haven’t left yet is unclear. 2）It was good news that everyone got back safely. 3）Polly didn’t know which way she should go. 4）I’m interested in who that tall man is. 5）We all thought it good news that the fog had finally gone. 6）My question is whether Polly can find her way home. 7）The fact that Polly didn’t ask for the man’s name is a pity. 总结：名词性从句主要由陈述句、一般疑问句、特殊疑问句充当。 1）陈述句充当名词性从句时，由that引导；2）一般疑问句充当名词性从句时，由if或whether引导从句；3）特殊疑问句充当名词性从句时，由疑问词本身做连词引导从句。4）名词性从句的语序应使用陈述句语序，不可用一般问句语序。 二、引导名词性从句的从属连词及从句语序 1.连接词that；功能1）不充当句子成分2）无词义3）只起连接作用。 2.if/whether;功能：1）意为“是否”，有词义2）不做句子成分3）起连接作用 翻译:
名词性从句知识点总结 在句子中起名词作用的句子叫名词性从句(Noun Clauses）。名词性从句的功能相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等，因此根据它在句中不同的语法功能，名词从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。 一．主语从句 主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。 1. It 作形式主语和it引导强调句的比较 It 作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。而it引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。被强调部分指人时也可用who/whom。例如： a) It is a pity that you didn’t go to see the film. 你不去看那场电影真可惜。 b) It doesn’t interest me whether you succeed or not.我对你成功与否不感兴趣。 c) It is in the morning that the murder took place.谋杀案是在早上发生的。（强调句型） d) It is John that broke the window.是John打碎的窗户。（强调句型） 2. 用it 作形式主语的结构 (1) It is ＋名词＋从句 It is a fact that …事实是… It is an honor that …非常荣幸 It is common knowledge that …是常识 (2) It is ＋形容词＋从句 It is natural that…很自然… It is strange that…奇怪的是… (3) It is ＋不及物动词＋从句 It seems that…似乎… It happened that…碰巧… It appears that…似乎… (4) It ＋过去分词＋从句 It is reported that…据报道… It has been proved that…已证实… It is said that…据说… 3. 主语从句不可位于句首的五种情况： （1）if 引导的主语从句不可居于复合句句首。 （2）It is said /reported…结构中的主语从句不可提前。例如： 正确表达：It is said that President Jiang will visit our school next week. 错误表达：That President Jiang will visit our school next week is said. （3）It happens/occurs…结构中的主语从句不可提前。例如： 正确表达：It occurred to him that he failed in the examination. 错误表达：That he failed in the examination occurred to him. （4）It doesn’t matter how/whether …结构中的主语从句不可提前。例如： 正确表达：It doesn’t matter whether he is wrong or not.
专题十名词性从句 第一节基本知识与基本概念 【什么是名词性从句？】 顾名思义，主语从句在句子中作主语。有时本身出现在主语的位置上，也有时出于句子结构的考虑退到句子的尾部，前面用形式主语it代替。从句作主语时，谓语动词一般为单数形式。如: What I saw was beyond any verbal description. That his hair was turning grey worried him a bit. Why the company denied the contract is still unknown. When and where the government will build a city square is under discussion. It is pretty annoying that a small part of the machine is missing. It remains to be seen whether the new novel will be well received. 【宾语从句】 在句子中作宾语的从句就是宾语从句。由于这是同学们接触比较早的一种从句，应该问题不大。所以在近年的高考题中，以宾语从句的知识作为考点的题目较少。但是，宾语从句也有自己的特殊情况，如介词的宾语，形容词的宾语，宾语从句提前和并列的宾语从句等现象。如： We assumed that there would be more than 100 guests. He told the police in detail what he saw and heard. Nobody is sure what humans will look like in a million years. That will depend on whether they can get the chance. Whether I will have the time I am not sure at the moment. The conductor complained that we were not gifted in singing and that he would never come again. 【表语从句】 表语从句的最重要脸谱就是它们应该出现在系动词的后面。如： The only question left is how often the workers are paid. His idea for the coming weekend is that we go skating. 【同位语从句】 从脸谱上看，同位语从句最为麻烦。因为它们也是出现在一个名词的后面，起着解释说明的作用。
名词性从句（二） ●知识点精讲透析 ●考点一表语从句 表语从句的连接词 (1) 从属连词that。在从句中不做成分。如： The trouble is that I have lost his address. 麻烦是我把他的地址丢了。 (2) 从属连词whether, as, as if。如： He looked just as he had looked ten years before. 他看起来还与十年前一样。 注：从属连词if一般不用来引导表语从句，但as if却可引导表语从句。如： All this was over twenty years ago, but it’s as if it was only yesterday. 这都是20多年前的事了，但宛如昨天一样。注：可接表语从句的连系动词有be, look, seem, sound, appear等。如： China is no longer what she used to be. 今日的中国不再是过去的中国了。 The question remains whether they will be able to help us. 问题还是他们能否帮我们。 He looked just as he had looked ten years before. 他看起来还与十年前一样。 (3) 连接代词who, whom, whose, what, which, whoever, whatever, whichever 在表语从句中做主语、宾语等。如：That was what she did this morning. 那就是他今天早上所做的。 (4) 连接副词where, when, how, why。如： What I wonder is when he left. 我想知道他是何时离开的。 (5) because, why引导的表语从句。如： That's because he didn't understand me. 那是因为他没有理解我。(That's because...强调原因) That's why he got angry with me. 那正是他对我生气的原因。(That's why...强调结果) I think it is because you are doing too much. 我想这是因为你做得太多。 (6) 在一些表示“建议、劝说、命令”的名词后面的表语从句中，谓语动词用虚拟语气。should+动词原形表示，should 可省略。如： My suggestion is that we (should) start early tomorrow. 我的建议是我们明天一早出发。 过手训练 1. You are saying that everyone should be equal, and this is _____ I disagree. A. why B. where C. what D. how 2. See the flags on the top of the building? That was _____ we did this morning. A. when B. which C. where D. what 3. Part of the reason Charles Dickens loved his own novel, David Copperfield, was _____ it was rather closely modeled on