定语从句和主语从句练习
高考英语三大从句(名词性从句、定语从句、状语从句)讲解+练习(附答案)
高考英语三大从句讲解+练习（附答案）【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，名词性从句成分为主语从句、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。
1. 主语从句作句子主语的从句叫主语从句。
主语从句通常由从属连词that，whether，if和连接代词what，who，which，whatever，whoever以及连接副词how，when，where，why等词引导。
that在句中无词义，只起连接作用；连接代词和连接副词在句中既保留自己的疑问含义、又起连接作用，在从句中充当从句的成分。
例如：What he wants to tell us is not clear. 他要跟我们说什么，还不清楚。
It is known to us how he became a writer. 我们都知道他是如何成为一名作家的。
Where the English evening will be held has not yet been announced.英语晚会将在哪里举行，还没有宣布。
有时为避免句子头重脚轻，常用形式主语it代替主语从句作形式主语放于句首，而把主语从句置于句末。
主语从句后的谓语动词一般用单数形式。
常用句型如下：（1）It + be + 名词+ that从句（2）It + be + 形容词+ that从句（3）It + be + 动词的过去分词+ that从句（4）It + 不及物动词+ that 从句另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“(should) +do”，常用的句型有：It is necessary (important, natural, strange, etc.) that …It is a pity (a shame, no wonder, etc.) that…It is suggested (requested, proposed, desired, etc.) that…注意：连词that, whether在从句中不担任句子成分，只起连接作用，不能省略。
从句练习题(含答案)
从句练习题（含答案）
1. 下列划线部分是一个从句的例子是：
A. 她说她已经看过这部电影。
B. 他们正在做的工作很重要。
C. 你想去哪里就去哪里。
D. 他喜欢的动物是猫。
答案：C. 你想去哪里就去哪里。
2. 下列句子中，含有定语从句的是：
A. 我买了一本新书。
B. 昨天我去了动物园。
C. 那是一个非常有趣的故事。
D. 我喜欢的颜色是蓝色。
答案：D. 我喜欢的颜色是蓝色。
3. 下列句子中，含有状语从句的是：
A. 我们正在学习英语。
B. 我的电脑坏了。
C. 当我看到他的时候，他正在吃饭。
D. 她买了很多漂亮的衣服。
答案：C. 当我看到他的时候，他正在吃饭。
4. 下列句子中，含有名词性从句的是：
A. 我想要一杯咖啡。
B. 你们是否听说过这个消息？
C. 他告诉我他明天要去旅行。
D. 地球是一个美丽的星球。
答案：B. 你们是否听说过这个消息？
5. 下列句子中，含有主语从句的是：
A. 下雨了，我不想出去。
B. 看见她的时候，他很高兴。
C. 谁在这个房间里？
D. 我们应该早点出发。
答案：C. 谁在这个房间里？
通过以上练习题，希望大家能够了解从句在句子中的作用，提高对从句的理解和运用。
从句在英语学习中非常重要，希望大家能够多加练习，掌握从句的用法，提高语言表达能力。
主语从句(考点分析+精讲精练)专题训练
高中英语语法之名词性从句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，名词性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33.some people regard as a drawback is seen as a plus by many others.A.WhetherB.WhatC.ThatD.How考点:本题考查主语从句。
句意：一些人眼中的缺点是别人眼中的优点。
解析：从句中缺宾语，只能用B.what来引导. C.中的That引导主语从句不做成分。
1．—How about camping this weekend,just for a change?—OK,you want.A．whichever B．however C．whatever D．whoever答案：C考点：本题考查引导词。
解析：句意：“这个周末野营怎么样，来点新鲜的？”“好啊，按你的意思吧！”根据语境分析出后者支持前面的提出的观点。
9．It is uncertain side effect the medicine will bring about,although about two thousand patients have taken it.A．that B．what C．how D．whether答案：B考点：本题考查主语从句的引导词。
解析：根据句意：尽管大约有两千名病人服用过这种药物，但是，它会带来什么样的副作用还不确定。
side effect意思是“副作用”，还原主语从句中的主干是the medicine will bring about ______side effect。
故选择what，形容词“什么样的”，起修饰作用。
【精讲精练】主语从句是一个重要的语法点，主语从句是中学阶段的重点语法项目,也是高考的热点之一。
托福写作：主语从句和定语从句
托福写作：主语从句和定语从句一、主语从句：用that 或wh-词引导的从句作为主句的主语名词。
1. whether 引导的主语从句例：Whether the increase of fuel price can solve the world's environmental problem is a controversial issue.Whether universities should provides students with practical skills or academic knowledge is a controversial issue.2.先行词it开始的主语从句例：It is obvious that we are living in an information age.It is obvious that investing in education is investing in one's future.3.what 引导的主语从句例：What the government should do is to create policies to encourage low carbon development.What most companies and workforces need are not robots, but creative people who can contribute ideas.What the poor countries need most is not money, but advanced technologies and talents in some key areas.二、定语从句1 who 引导，修饰“人”例：Those who feel that sports stars' salaries are justified might argue that the number of professionals with real talent are very few.Students without teachers will surely be lost; but students who simply rely on teachers for knowledge aren't really learning.Children who enter school at an early age are generally more confident and independent than children who stay at home with their parents.2.that 引导，修饰“物”例: Likewise,economics is a fundamental discipline that allows societies to be stable and move forward.The workload that could take months to finish by manual labor could be done flawlessly by robots in minutes.How to handle criminals is a problem (that) all countries and societies face. (that 在定语从句中做宾语可省略)3. 逗号后加which 引导，修饰前面的整个句子（非限制性定语从句）例If fuel prices go up, either fewer people will drive or people will drive less, which makes sense for reducing polltion.Demand for various commodities creates a huge market for the local and international businesses,which in trun increases demand for the labor market.Government should develop and launch a good traddic control system, which can monitior and facilitate traffic flows on major roads for better and safer roadusage,reducing the chances of accidents.。
名词性从句详解及练习
各类从句详解英语从句可以分为名词性从句、定语从句和状语从句三大类：下面我们逐一进行说明：一、名词性从句（主语从句、表语从句、宾语从句、同位语从句）主语从句、表语从句、宾语从句和同位语从句在复合句中的充当的成分和其名称相同，分别作主句的主语、表语、宾语和同位语。
上述这四种从句均被称为名词性从句。
所有的名词性从句均不能用逗号分开，并且它们都用相同的关联词，关联词如下：①主从连词：that (无意义), whether (是否), if (是否)（在句子中不充当任何成分）②连接代词：who (谁), whom (谁), whose (谁的), what (什么), which (哪一个)③连接副词：when (什么时候), where (什么地方), how (怎样), why (为什么)主从连词只起连接作用，连接代词和连接副词除了起连接作用外，还充当从句某一个成分。
另外，可以用whatever, whichever, whoever, who(m)ever等连接代词引导名词性从句，来加强语气。
下面分别对各种名词性从句进行介绍（一）主语从句（subject clause）在主句中用作主语的主谓结构称之为主语从句。
例如：That he will come to the discussion is certain.他来参加讨论是确定的。
That the moon moves round the earth is well known to all of us.月球绕地球转动，这是我们大家都熟知的。
When the meeting is to be held has not yet been decide.会议什么时候召开还没有决定。
主语从句放在句首，句子常常显得比较笨重，因此通常可以把it放在句首，作形式主语，而将主语从句放在后面。
例如上面的句子可以分别改写为：It is certain that he will come to the discussion.It is well known to all of us that the moon moves round the earth.It has not yet been decide when the meeting is to be held.下面再举一些例句：What they are after is profit.他们追求的是利润。
高三英语主语从句试题答案及解析
高三英语主语从句试题答案及解析1. The Foreign Minister said，“________ our hope that the two sides will worktowards peace.”A．This is B．There isC．That is D．It is【答案】D【解析】D[句意：外交部长说：“我们希望双方能相互合作，致力于和平事业。
”句中的that从句是名词性从句，作真正的主语，前面用it作形式主语。
]2. It makes little difference to me ________we go or stay.A．whether B．where C．that D．how【解析】A解析whether...or...或者……或者……，whether引导的从句为真正的主语，it为形式主语。
3. It doesn't matter ________ you pay by cash or credit card in this store.(2012·山东 )A．how B．whether C．what D．why【答案】B【解析】考查主语从句。
句意：在这家商店，你是用现金还是用信用卡结账都没关系。
结合句意可知应选whether。
It是形式主语，whether引导的从句是真正的主语，whether表示“不管，是否”。
连接副词how在从句中作方式状语，表示“怎样”，连接副词why在从句中作原因状语，表示“为什么”，what是连接代词，在从句中作主语、宾语、表语或定语，均不符合句意。
4. The limits of a person's intelligence，generally speaking，are fixed at birth，but ________ he reaches these limits will depend on his environment.(2011·安徽)A．where B．whether C．that D．why【答案】B【解析】whether引导主语从句，意为“是否”。
主语从句练习50题
主语从句练习50题1. ______ makes me happy is reading books.A. WhatB. ThatC. WhetherD. How答案：A。
本题考查主语从句的引导词。
“What”在从句中充当主语，表示“什么”；“That”在主语从句中不充当成分，且没有实际意义，放在此处句子意思不完整；“Whether”表示“是否”，不符合句子意思；“How”表示“如何”，也不符合句子意思。
所以选择A 选项。
2. ______ he will come or not is still unknown.A. WhatB. ThatC. WhetherD. How答案：C。
“Whether...or not”是固定搭配，表示“是否”；“What”“That”“How”都不能与“or not”这样搭配，所以选择C 选项。
3. It is not clear ______ he did it.A. whatB. thatC. whetherD. how答案：C。
句子意思是“不清楚他是否做了这件事”，“Whether”表示“是否”，符合句子语境；“What”在从句中充当成分，此处不缺成分；“That”在主语从句中不充当成分，且没有实际意义，放在此处句子不通顺；“How”表示“如何”，不符合句子意思。
因此选择C 选项。
4. ______ is important for us to learn English well.A. WhatB. ThatC. WhetherD. How答案：B。
“That”引导的主语从句，“That”在从句中不充当成分，且没有实际意义，此处只是单纯陈述“学好英语对我们很重要”这个事实；“What”“Whether”“How”在句子中意思不符合，所以选择B 选项。
5. ______ we need is more time.A. WhatB. ThatC. WhetherD. How答案：A。
名词性从句选择题练习题
名词性从句选择题练习题一、宾语从句1. The teacher asked us ______ we needed more practice.A. thatB. whatC. whichD. ifA. thatB. whetherC. ifD. what3. Can you tell me ______ the nearest post office is?A. whereB. whatC. whichD. how二、表语从句4. The reason why he was late is ______ he missed the bus.A. thatB. becauseC. whyD. what5. This is ______ I want to tell you.B. whatC. whichD. how6. The question is ______ we can finish the task on time.A. whetherB. ifC. thatD. what三、主语从句7. ______ he will attend the meeting is still unknown.A. ThatB. WhetherC. IfD. What8. ______ is important is that we should be punctual.A. WhatB. ThatC. WhetherD. If9. ______ they will succeed in the experiment remains to be seen.A. IfB. WhetherD. What四、同位语从句10. The fact ______ he has been fired surprised all of us.A. thatB. whatC. whichD. whether11. The news ______ our team has won the game is exciting.A. thatB. whatC. whichD. if12. I have no doubt ______ he is the right person for the job.A. thatB. whatC. whichD. whether五、名词性从句综合练习13. ______ you don't like him is none of my business.A. ThatB. WhetherC. If14. Please tell me ______ you found the lost wallet.A. whereB. whatC. whichD. how15. ______ he didn't show up at the meeting is still a mystery.A. WhyB. WhatC. WhetherD. If16. The teacher explained ______ we should follow the rules.A. thatB. whatC. whichD. howA. WhetherB. IfC. ThatD. What18. ______ you said at the meeting was a big surprise to us.B. WhatC. WhetherD. If19. ______ the meeting will be held on time is still under discussion.A. WhetherB. IfC. ThatD. What20. ______ he needs more practice is obvious to everyone.A. ThatB. WhatC. WhetherD. If六、连接词辨析21. ______ he arrived late was due to the heavy traffic.A. WhyB. WhenC. ThatD. Which22. You can go anywhere you like, ______ you let me know in advance.A. as long asB. in caseC. provided thatD. unless23. ______ she was tired, she kept working until midnight.A. AlthoughB. BecauseC. SinceD. If七、名词性从句与定语从句的区别24. The book ______ you gave me is very interesting.A. thatB. whichC. whatD. whose25. I don't know the reason ______ he left the party early.A. whyB. thatC. whichD. what26. ______ is known to all is that the Earth is round.A. ItB. WhatC. ThatD. This八、名词性从句的省略27. The teacher said ______ would happen at the party wasa surprise.A. thatB. whatC. itD. which28. I think ______ you did was right.A. thatB. whatC. itD. which29. ______ is obvious is that he made a mistake.A. ItB. ThatC. WhatD. This九、名词性从句的特殊用法30. ______ he is honest is the reason ______ I trust him.A. That; thatB. What; whatC. Whether; whyD. If; that31. ______ you can see from the chart, the sales have been increasing.A. ThatB. WhatC. AsD. Which32. ______ he had finished his work surprised everyone.A. ThatB. WhatC. HowD. Whether十、名词性从句的固定搭配33. The key to success is ______ you never give up.A. thatB. whatC. whyD. how34. ______ he did it was a mystery to all of us.A. ThatB. HowC. WhatD. Whether35. ______ he said at the meeting was not what we expected.B. WhatC. WhetherD. If答案一、宾语从句1. D2. B3. A二、表语从句4. A5. B6. A三、主语从句7. B8. A9. B四、同位语从句10. A11. A12. A五、名词性从句综合练习13. A14. A16. A17. A18. B19. A20. A六、连接词辨析21. C22. A23. A七、名词性从句与定语从句的区别24. A25. A26. B八、名词性从句的省略27. B28. B29. C九、名词性从句的特殊用法30. A31. C32. A十、名词性从句的固定搭配33. B34. B35. B。
主语从句60题(最新整理)
1.______Li Bai,a great Chinese poet,was born is known to the public,but some won’t accept it.A.ThatB.WhyC.WhereD.How[答案] 1.C[解析] 1.句意:李白,中国伟大的诗人,出生在什么地方人人皆知,但是有些人对此并不接受。
本题考查主语从句。
“______Li Bai,a great Chinese poet,was born”为主语从句,该从句缺少状语,结合选项可知答案应为C。
2.If you swim in a river or lake,be sure to investigate______is below the water surface.Often there are rocks or branches hidden in the water.A.whatB.whoC.thatD.whoever[答案] 2.A[解析] 2.句意:如果你在河里或湖里游泳,一定要查明水下的状况。
经常会有岩石或树枝隐藏在水中。
本题考查名词性从句。
动词investigate后的宾语从句中缺少主语,同时主语为物,故排除B、C、D三项。
根据句意可知选A。
3.______we understand things has a lot to do with what we feel.A.WhereB.HowC.WhyD.When[答案] 3.B[解析] 3.句意:我们怎样理解事物与我们的认知有很大关系。
本题考查名词性从句。
A项在从句中作地点状语;B项在从句中作方式状语,意为“如何”;C项意为“为什么”;D项意为“什么时候”。
故选B项。
4.I truly believe______beauty comes from within.A.thatB.whereC.whatD.why[答案] 4.A[解析] 4.句意:我确信美丽源自内心。
英语语法 主语从句
3.Whether he will come (or not) hasn’t been decided
6.Why he didn’t come here remained unknown.
7.What you need is more pracitce.
1. that 引导主语从句, that 不可以省略 The earth is round is true. × That the earth is round is true.
碰巧
(2) It is / was + adj. that… It is certain that she will do well in the exam.
如果是 it is surprising important necessary natural essential
that …+ (should) do…
用主语从句翻译下列句子
1.很明显我们需要更多的练习。(clear) That we need more practice is very clear. It is very clear that we need more practice. 2.他这么早去上学真是非比寻常。(unusual) It is unusual that he should go to school so early.
主语从句： 由一个从句来充当句子的主语的复合句。
1.That the earth is round is true.
2.That you don’t like him has nothing to do with me 4.When and where he was born is still unknown. 5.How this happened is still a question.
高中主语从句练习题及讲解答案
高中主语从句练习题及讲解答案# 高中主语从句练习题及讲解答案## 练习题1. 题目一：尽管他很年轻，但他已经是一位成功的企业家了。
- 例句：_________ he is very young, he has already becomea successful entrepreneur.2. 题目二：无论你什么时候来，我都会在这里等你。
- 例句：_________ you come, I will be here waiting for you.3. 题目三：他相信他能通过这次考试，这让他的父母感到非常高兴。
- 例句：He believes that he can pass the exam, which makes his parents very happy.4. 题目四：我们不知道他是否已经完成了作业。
- 例句：We don't know _________ he has finished his homework or not.5. 题目五：她害怕黑暗，这是众所周知的。
- 例句：She is afraid of the dark, which is _________.## 讲解主语从句是作为动词或介词的宾语的从句，它通常位于句首。
主语从句可以由连接词that, if, whether等引导。
- that引导的主语从句：用来陈述一个事实，通常可以省略。
- if/whether引导的主语从句：用来表达“是否”，通常不能省略。
## 答案1. 答案一： Although/Though _________ he is very young, hehas already become a successful entrepreneur.- 讲解：这里使用了“Although”或“Though”来引导让步状语从句，表示尽管他年轻，但他已经成功。
2. 答案二： Whenever _________ you come, I will be herewaiting for you.- 讲解：“Whenever”引导主语从句，表示无论何时你来。
主语从句重点练习50题
主语从句重点练习50题1. _____ is important for us to learn English well.A. ThatB. ItC. ThisD. What答案：B。
本题考查it 作形式主语的主语从句。
It 在句中作形式主语，真正的主语是后面的动词不定式短语“to learn English well”。
A 选项“that”引导主语从句时，在句中不充当任何成分；C 选项“this”一般不引导主语从句；D 选项“what”在主语从句中充当成分，而本句不缺成分。
2. _____ makes mistakes must correct them.A. WhoB. AnyoneC. WhoeverD. Anybody答案：C。
“whoever”引导主语从句，表示“无论谁”。
A 选项“who”表示“谁”，没有“无论谁”的意思；B 选项“anyone”不是引导词；D 选项“anybody”也不是引导词。
3. _____ he will come or not is unknown.A. WhetherB. IfC. ThatD. What答案：A。
whether 引导主语从句，表示“是否”，且whether...or not 是固定搭配。
B 选项“if”也表示“是否”，但不能与or not 连用；C 选项“that”在主语从句中不表示“是否”；D 选项“what”在句中充当成分，本句不缺成分。
4. _____ we need is more time.A. ThatB. WhatC. WhetherD. If答案：B。
本题考查what 引导的主语从句。
what 在从句中充当need 的宾语。
A 选项“that”在从句中不充当成分；C 选项“whether”表示“是否”；D 选项“if”也表示“是否”。
5. _____ she did is not known.A. WhatB. HowC. ThatD. Where答案：A。
新概念英语第三册从句语法讲解课件及习题
④．This is the very dictionary that I want to find .
• I have no idea when he will come back home. • He must answer the question whether he agrees
to it or not.
重点：同位语从句有时不是紧跟 在名次的后面
• The thought came to him ___A___Mary
3、宾语从句：
1）做及物动词的宾语 • I don’t know if(whether) it is interesting. 。 • He doesn’t care if it isn’t a fine day. （从
句是否定句时一般用if引导。 ） • I believe(that) he is honest. • I wonder whether he will come or not. • Everything depends on whether we have
interest to us all. When and where we shall do the test is still in
question. Why she left me is still a mystery to me.
为了避免头重脚轻， It 做形式主语
1. It’s necessary/important,clear +thatclause
高中从句练习题及讲解
高中从句练习题及讲解
1. 题目：请用定语从句描述你最喜欢的季节。
答案：我最喜欢的季节是春天，春天是万物复苏，鲜花盛开的季节。
2. 题目：使用宾语从句写一个关于你梦想的句子。
答案：我梦想有一天能够环游世界，见识不同的文化和风景。
3. 题目：用状语从句描述你早晨起床后的活动。
答案：早晨起床后，我总是先喝一杯温水，然后开始我的晨练。
4. 题目：使用主语从句写一个关于学习的重要性的句子。
答案：学习新知识是提高个人能力的重要途径，这对我来说是不言
而喻的。
5. 题目：用同位语从句描述你的朋友。
答案：我的朋友，一个热情开朗的人，总是能在困难时刻给我鼓励。
6. 题目：使用条件状语从句表达对未来的期望。
答案：如果我能够努力学习，我相信我将来会成为一名优秀的科学家。
7. 题目：用虚拟语气的从句写一个关于过去的假设。
答案：如果我去年没有参加那个夏令营，我就不会认识那么多有趣
的人。
8. 题目：使用让步状语从句描述一个不变的事实。
答案：尽管天气很冷，但我还是坚持每天早晨跑步。
9. 题目：用强调句型写一个关于友谊的句子。
答案：正是那些困难时刻，让我意识到了朋友的重要性。
10. 题目：使用原因状语从句解释为什么你选择学习这门课程。
答案：我选择学习这门课程是因为我对这门学科充满了浓厚的兴趣。
这些练习题覆盖了从句的多种类型，包括定语从句、宾语从句、状语从句、主语从句、同位语从句、条件状语从句、虚拟语气、让步状语从句、强调句型和原因状语从句。
通过这些练习，可以帮助学生更好地理解和运用英语中的从句结构。
同时含有主语从句和定语从句的句子
主题：我国医疗卫生事业发展现状随着经济的发展和人民生活水平的提高，我国的医疗卫生事业也得到了长足的发展。
然而，与此我国医疗卫生事业也面临着一些挑战和问题。
本文将围绕我国医疗卫生事业的发展现状进行探讨，并分析其中存在的问题和挑战。
一、我国医疗卫生事业的发展成就1.1 政府投入加大，医疗资源不断增加。
近年来，我国政府加大了对医疗卫生事业的投入，医疗资源得到了明显增加，医院建设不断加快，医疗设备水平不断提高。
1.2 技术水平不断提高，医疗服务水平逐步提升。
随着科技的不断进步，我国医疗技术不断更新，医疗服务水平也在逐步提高，患者得到更好的治疗和照顾。
1.3 医保制度不断完善，保障了大部分人民的基本医疗需求。
我国不断完善医疗保险制度，基本医疗需求得到了保障，大部分人民能够享受到基本医疗服务。
二、存在的问题和挑战2.1 医疗资源不均衡，城乡差距明显。
我国医疗资源存在明显的城乡差距，城市医疗资源丰富，而农村医疗资源相对匮乏，医疗水平不高。
2.2 医患关系紧张，医疗纠纷频发。
近年来，医患关系紧张，医疗纠纷频发，一些医生因此心灰意冷，一些患者因此感到不满和失望。
2.3 医疗服务质量参差不齐，有些医院存在不良现象。
虽然我国医疗技术水平不断提高，但是一些医院存在服务态度差、医疗质量参差不齐的现象，严重影响了患者就医体验。
三、对策和建议3.1 加大对医疗卫生事业的投入，加大农村医疗资源建设。
政府应加大对医疗卫生事业的投入，加大对农村医疗资源建设的力度，缩小城乡医疗资源差距。
3.2 加强医患交流，建立和谐医患关系。
医院应加强对医生的专业技能培训，提高对医患交流的重视，建立和谐医患关系，减少医疗纠纷的发生。
3.3 加强医院管理，规范医疗行为。
政府应加大对医院管理的监督力度，对医疗行为进行规范和监管，提高医院的管理水平，保障患者的合法权益。
总结：我国医疗卫生事业取得了长足的发展成就，但同时也面临着一些问题和挑战。
只有政府、医院和社会各界齐心协力，共同努力，才能够进一步提升我国医疗卫生事业水平，为人民健康保驾护航。
高中英语主语从句单选题50题
高中英语主语从句单选题50题1. _____ is known to us all that the sun rises in the east.A. ItB. ThatC. AsD. What答案：A。
本题考查it 作形式主语的用法。
It is known to us all that...是一个固定句型，it 作形式主语，真正的主语是that 引导的从句。
选项B 中的that 不能作形式主语；选项C 的as 通常用于引导定语从句或状语从句；选项D 的what 引导主语从句时在从句中要充当成分，而本句不缺成分。
2. _____ makes mistakes must correct them.A. WhoB. AnyoneC. WhoeverD. Anybody答案：C。
本题考查主语从句的引导词。
whoever 表示“无论谁”，引导主语从句，在从句中作主语。
选项A 的who 表示“谁”，没有“无论谁”的意思；选项 B 的anyone 不能引导从句；选项 D 的anybody 与anyone 意思相近，也不能引导从句。
3. _____ will give us a talk is unknown to us all.A. WhoC. WhichD. Whom答案：A。
本题考查主语从句的引导词。
根据句意，“谁将给我们做报告我们都不知道”，who 在从句中作主语。
选项B 的that 引导主语从句时在从句中不充当成分；选项 C 的which 通常表示“哪一个”，在本题中不符合语境；选项D 的whom 是宾格，在从句中作宾语。
4. _____ he has become a rich man is known to all in our town.A. BecauseB. ThatC. /D. What答案：B。
本题考查主语从句的引导词。
that 引导主语从句时在从句中不充当成分，也没有实际意义，只起连接作用。
主语从句整理及其他试题
从句是相对于主句而言的,即它是从属于某一个主句，而不能单独作一个句子。
在英语中，主要有三大从句，即1。
名词性从句（包括主语从句，宾语从句，表语从句,同位语从句);2. 定语从句；3。
状语从句（包括时间、条件、结果、目的、原因、让步、地点、方式等）。
主语从句1．定义：主语从句是指在复合句中做主句主语的从句。
2。
构成：关联词+简单句3．表现形式：A．由从属连词（that，whether，if）引导e.g. That the plates are moving is beyond dispute. 板块在运动，这是无可置疑的.提问:The plates are moving is beyond dispute. 这样表达对吗？e.g. That our environment has little, if anything，to do with our abilities, characteristics and behavior is central to that theory. 这种理论的核心是,我们的环境同我们的才能，性格特征和行为即使有什么关系的话,也是微不足道的。
e.g。
Whether she will come or not is still a question . 她是否来仍然是个疑问。
e.g. Whether the results will be valuable, meaningless, or even misleading depends partly upon the tool itself but largely upon the user. 结果究竟是有价值的，还是无意义的，甚至是误导的，这在部分程度上取决于工具本身，但在很大程度上取决于使用者.特别提示：当whether 引导的主语从句位于句首时，不能有if 代替;当whether 引导主语从句位于句尾时,whether可以有if 代替，但if 通常不能与or not 搭配.B. 由连接代词(who，whom,whose，what，which,whoever，whatever，whichever）引导e。
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定语从句和主语从句练习（二）1.The old town has narrow streets and small houses ______ are built close to each other.A theyB whereC whatD that2.Between the two parts of the concert is an interval, ______ the audience can buy ice-cream.A whenB whereC thatD which3.Whatever is left over may be put into the refrigerator, _____it will keep for two or three weeks.A whenB whichC whereD while4.Julie was good at German, French and Russian, all of _____ she spoke fluently.A whoB whomC whichD that5.I walked up to the top of the hill with my friends, _____ we enjoyed a splendid view of the lake.A whichB whereC whoD that6.She showed the visitors around the museum, the construction _____ had taken more than three years.A for whichB with whichC of whichD to which7.The prize will go to the writer _____ story shows the most imagination.A thatB whichC whoseD what8.Ted came for the weekend wearing only some shorts ans a T-shirt, _____ is a stupid thing to do in such weather.A thisB thatC whatD which9.As a child, Jack studied in a village school, _____ is named after his grandfather.A whichB whereC whatD that10.I refuse to accept the blame for something ______ was someone else’s fault.A whoB thatC asD what11.Wind power is an ancient source of energy _____ we may return in the near future.A on whichB by whichC to whichD from which12.After graduating from college, I took some time off to go travelling,______ turned outto be a wise decision.A thatB whichC whenD where13.The house I grew up _____ has been taken down and replaced by an office building.A in itB inC in thatD in which14.Occasions are quite rare ______ I have the time to spend a day with my kids.A whoB whichC whyD when15.We went through a period _______communications were very difficult in the rural areas.A whichB whoseC in whichD with which16.The book was written in 1946, ______ the education system has witnessed great changes.A whenB during whichC since thenD since when17.Those successful deaf dancers think that dancing is an activity ____ sight matters more than hearing.A whenB whoseC whichD where18.Chan’s restaurant on Baker Street, ______ used to be poorly run, is now a successful business.A thatB whichC whoD wherest week, only two people came to look at the house, _____ wanted to buy it.A none of themB both of themC none of whomD neither of whom20.Women ______ drink more than two cups of coffee a day have a greater chance of having heart disease than those ______ don’t.A who;/B /;whoC who;who D/;/21.The Beatles, _____ many of you are old enough to remember, came from Liverpool.A whatB thatC howD as22.From space, the earth looks blue. This is _____ about seventy-one percent of its surface is covered by water.A whyB howC becauseD whether23._____ makes the book so extraordinary is the creative imagination of the writer.A. ThatB. WhatC. WhoD. Which24.______ I want to tell you is the deep love and respect I have for my parents.A. ThatB. WhichC. WhetherD. What25.________ one of you breaks the window will have to pay for it.A. WhoeverB. WhateverC. WhicheverD. Wherever26.It remains to be seen _____ the newly formed committee’s policy can be put into practice.A thatB whichC whatD whether27.______ you said at the meeting describes a bright future for the company.A. WhenB. HowC. WhatD. Which28.______ struck me most in the movie was the father’s deep love for his son.A. ThatB. ItC. WhatD. Which29.It doesn’t matter _____ you turn right or left at the crossing---both roads lead to the park.A whetherB howC ifD when30.The newcomer went to the library the other day and searched for _____ he could find about Mark Twain.A whereverB howeverC whateverD whichever31.Everyone in the village is very friendly. It doesn’t matter _____ you have lived there for a short or a long time.A whyB howC whetherD when32.As many as five courses are provided, and you are free to choose ______ suits you best.A whateverB whicheverC wheneverD wherever33.It is by no means clear_____ the president can do to end the strike.A howB whichC thatD what34.I am afraid he’s more of a talker than a doer, which is _____ he never finishes anything.A thatB whenC whereD why35.It never occurred to me _______ you could succeed in persuading him to change his mind.A whichB whatC thatD if36.One reason for her preference for city life is ______ she can have easy access to places like shops and restaurants.A thatB howC whatD why37._____ was most important to her, she told me, was her family.A. ItB. ThisC. WhatD. As38.It is none of your business ______ other people think about you. Believe yourself.A howB whatC whichD when39._____ parents say and do has a lifelong effect on their children.A. ThatB. WhichC. WhatD. As40.See the flags on top of the building?That was _____ we did this morning.A whenB whichC whereD what。