主语从句讲解和练习

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WORD 格式整理.
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that,how,whether 都不能表达这个意思.
主语从句练习题
1. C makes mistakes must correct them. A. What B. That C. Whoever D. Whatever 这句话强调的是普遍性，所以用 whoever——任何人，而不是特指谁
成功地说服他改变.
第 二 ,It never occurred to me 是用于对于某个已发生的事实表示惊讶、吃惊的句型,所
以这里 you could succeed in persuading him to change 这个事实只能用 that 来引导；
if 是用于引导一个不确定性（uncertainty）的,这里不可以用.
高考题：
1、It never occurred to me C_you could succeed in persuading him to change his
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WORD 格式整理.
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mind.(陕西高考)
A．which
B．what
C．that
D．If
首先要理解句意.
这句话的意思是说,我从来没想到你能够成功地说服他去改变,而不是我从来没想到你能否
类似的名词还有：a pity；a wonder；a good thing； no wonder； surprise 等。
It is a mystery to me how it all happened. It is common knowledge that the whale is not a fish. It is no surprise that Bob should have won the game.
It makes no difference whether he will attend the meeting or not. It does not matter if I missed my train. It happened that I saw him yesterday. (2)对于以连接代词(副词)引导的主语从句，可以使用形式主语代主语从句，也可直接在 句首使用主语从句： Whether they would support us was a problem. 他们是否会支持我们还是一个问题。 It was a problem whether they would support us.他们是否会支持我们还是一个问题。 (3)对关系代词型 what 引导的主语从句，通常直接将主语从句放在句首。如： What we need is money. 我们需要的是钱。 What I want to know is this. 我想知道的就是这一点。 有时也可将助用形式主语。如：It is clear enough what he meant. 他是什么意思很清 楚。 (4) 如果句子是疑问句，则必须用带形式主语 it 的结构： Is it true that he is the girl’s father? 他是那女孩的父亲，是真的吗？ How is it that you are late again? 你怎么又迟到了？ 四、连词 that 的省略问题 引导主语从句的连词 that 有时可省，有时不能省，其原则是：若 that 引导的主语从句直 接位于句首，则 that 不能省略；若 that 引导的主语从句位于句末，而在句首使用了形式 主语 it，则 that 可以省略： That you didn’t go to the talk was a pity. 很遗憾你没去听报告。(that 不可省) It was a pity (that) you didn’t go to the talk. 很遗憾你没去听报告。(that 可省)
Whatever we do is to serve the people. 注：whatever / whoever 的功用 whatever, whoever 在主语从句中不含疑问意义。它引导主语从句，并在从句中作主语、 宾语、表语等。 whatever = anything that; whoever = anyone who。要注意和 whatever, whoever 引导 的让步状语从句的区别。 如：Whoever breaks the law should be punished. （主语从句） （ ＝Anyone who breaks the law should be punished. ）
C．That
D．How
考查名词性从句中的主语从句用法.此处要分析句子结构,看出 it 为形式主语,代替 that they should get well prepared for their future,并且本句意思完整,故选 D.
4、It is uncertain A side effect the medicine will bring about，although about two thousand patients have taken it.(2010·浙江)
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WORD 格式整理.
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主语从句
一、主语从句的连词分三类 （1）从属连词引导的主语从句 （that whether if） that 引导的主语从句:引导词 that 无含义/在句中不做成分/不可以省。That 引导主语从 句通常用 it 作形式主语。 例如：That you will win the medal seems unlikely.
they should get well prepared for their future,并且本句意思完整,故选 D.
3、 B some people regard as a drawback is seen as a plug by many
others.(2010·北京)
A．Whether B．What
discussed; required; decided; suggested; demanded; made clear; found out,etc.
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例如：It is used to be thought that a new star must be due to a collision between two stars.
Whoever breaks the law, he should be punished. （让步状语从句） （ ＝No matter who breaks the law, he should be punished. ） 3用连接副词 when, where, why, how 引导的名词性从句(其连接副词有含义,在句中作 状 语。) 例如:Where we should leave it is a problem.
2. It worried her a bit B_ her hair was turning grey. A. while B. that C. if D. for 解析：句意：她的头发渐渐变得花白,使她不安.该题常错选 C、D.用 if 和 whether 引导该 句则句意不通.主语从句较长时,多放在句子后部,用 it 作形式主语,此时,that 也不能省略.
<c> It is +过去分词+从句 It is said that … 据说……；It is reported that … 据报道……；It has been proved that … 已证明……；It must be proved that… 必须指出……
类似的过去分词还有：known; estimated; expected; believed; thought; hoped; noted;
<b> It is +形容词+从句 It is necessary that … 有 必 要 ……；It is clear that … 很 清 楚 ……；It is likely that … 很可能……；It is important that … 重要的是…… 类似的形容词还有：strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc. It is doubtful whether she will be able to come. It is essential that he should be here by the weekend. It seems obvious that we can not go on like this. It is necessary that you （should）master the computer. 需要注意的是这类主语从句中，谓语动词很多为“（should）＋动词原形”，即要用虚拟 语气。
2、It's obvious to the students B they should get well prepared for their
future.(天津卷)
A．as
B．that
C．which
D．Whether
考查名词性从句中的主语从句用法.此处要分析句子结构,看出 it 为形式主语,代替 that
It has not been made clear when the new road is to be opened to traffic. <d> It seems 不及物动词（happened / appears / doesn’t’t matter / makes no difference / occurred …）that …主语从句不可提前
That she survived the accident is a miracle. whether 引导的主语从句: whether 有含义(是否)/在句中不做成分/不可以省。 注意：引导主语从句，不能用 if 不能在开头，只能用 whether。 Whether we will hold a party in the open air tomorrow depends on the weather. Whether she is coming or not doesn’t matter too much. 2 用连接代词引导的主语从句 在 由 连 接 代 词 who, whose, whom, which, what, whoever, whomever, whichever, whatever 引导的名词性从句中，其连接代词在句中起名词性作用，担当一定成分. 例如：What you need is more practice.
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When they will come hasn’t been made pubic. 三、it 作形式主语的主语从句 有时为了考虑句子平衡，通常在主语从句处使用形式主语 it，而将真正的主语从句移至句 末。这分四种情况： (1) 对于以连词 that 引导的主语从句，通常用形式主语 it 替代主语从句： <a> It is +名词+从句 It is a fact that… 事实是……；It is good news that … ……是好消息；It is a question that … ……是个问题；It is common knowledge that … ……是常识
A．that
B．how
C．what
D．Whether
whether 是“是否”的意思 这里应该是选 B,what. 因为跟后面 side effect 连起来,what side effect,一起表示“是什么副作用” 整句话的意思是“虽然有两千多个病人服用的这个药,但是对于其带来的具体的什么副作用 还是不明确的.” 根据意思来选择,只能是 B