语法名词性从句(T)
一、名词性从句总述
1. 定义：在句子中起名词作用的句子叫名词性从句 (Noun Claus）。
1）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。
2）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。
主语从句 What he wants to tell us is not clear.happy happy
名词性从句 宾语从句 He has told me that he will go to Shanghai tomorrow.
表语从句 The fact is that we have lost the game.
同位语从句 I have no idea when he will come back home.
这里重点强调一下同位语从句，顾名思义，所谓同位语从句就是一个句子与主句中某一个名词互为同位语！
那么什么是同位语呢，很简单就是相同地位，相同成分，平起平坐， A(名词)=B（从句）, B（从句）=A（名词）, 去掉任何一部分（A/B）对整个句子都不影响。
个人陈述 英文
幼儿园中班家长会发言稿而且与从句互为同位语的名词一般为抽象名词，例如：advice、demand、doubt、fact、hope、idea、information、
message、news、order、problem、promi、question、request、suggestion、truth、wish、word等。
2. 引导名词性从句的连接词
引导名词性从句的连接词可分为三类：
1.连词：that（无任何词意）whether, if（均表示“是否”）as if ,as though（均表示“好像”，
“似乎”）以上在
从句中均不充当任何成分
2. 连接代词：what, whatever, who, whoever, whom, who, whichever, whomever
3. 连接副词：when, where, how, why, how many, how much, how often
连接词的判定：根据连接词在从句中所做的不同的成分，我们可以归纳如下：
人 物
主语 ： who what
宾语： whom what
疯狂动物城英文版
名词性从句 表语： whom what
定语： which what who
状语： when where why how (how many, how much, how often)
不做成份：that if/whether as if /as though becau
3. 名词性从句解题思路
1. 从句子结构入手，首先分清楚简单句和复合句。
2. 连词的选用依据 “缺什么补什么”原则确定正确的连词。如果句子中缺主语，指人用who，指物用what；
如缺宾语，指人用whom，指物用what；如缺时间状语用when；地点状语用where；原因状语用why；
方式状语用how；定语用what或which；什么都不缺用that。whether 和if（是否）。
二、名词性从句知识点详解
知识点1：主语从句
一、主语从句的定义
在复合句中作主句的主语的从句。
二、主语从句的关系词
引导词有连词that (that 不可省)，whether； 代词有who, whoever, what ,which；副词 when ,where, how, why 等。如:
1.由从属连词引导的主语从句：
a. Whether the country should build a nuclear power station is something we must discuss.
b. That light travels in straight line is known to all. =It is known to us all that light travels in straight line .
注意 ：连词that, whether引导的主语从句，在从句中不作任何成分，不能省略，多用it作形式主语。
2.由连接代词引导的主语从句：
a. What we need is more time. = The thing that we need is more time.
b. Which type of coal they are going to burn needs to be decided.
c. Whoever is here gets a prize.
注意：who是连接代词，引导主语从句，在从句中作主语不能省略，what引导的主语从句有时相当于
“先行词+that”
3.由连接副词引导的主语从句： application是什么意思
a. When the plane is to take off hasn’t been announced.
b. Where he has been is still a puzzle.
c. How much water is flowing can be measured easily.
注意：
(1)单个主语从句作主语时（包括两个或多个连接词引导一个主语从句），谓语动词要用单数；如果由and 连
接的两个或两个以上的主语从句作主语时，谓语动词用复数。如：
When the meeting will begin has not been decided yet.
When they will start and where they go have not been decided yet.
When and where the meeting will begin has not been decided yet.
(2)platelet主语从句放在句首往往显得头重脚轻，不太平衡，因此，在大多数情况下都是在主语的位置上用一个形式
主语 it，而把主语从句移到句未去。 it 作形式主语，把主语从句后置的常用句型有：
1）It + be + 形容词 + that从句
It is quite clear that Tom was fond of music.
2）It + be + 名词 + that从句
It is a pity that she has made such a foolish mistake.
3）It + be + 过去分词 + that从句
It’s not yet decided that when the test will be given.
4）It ems, happens 等不及物动词 + that从句
It happened that I didn’t take any money with me.
It ems that he doesn’t like the dish.
注意：it作为形式主语引导的主语从句是考试的重点，需要主要和强调句型区分开来。
要注意以下情况：
1. 当what引导的主语从句表示“……东西”时，一般不用it作形式主语。
What he needs is more experience.
2. 表示“无论……”Whatever, whoever, whichever引导的主语从句一般也不用it作形式主语。 如：
Whatever he has done is right.
Whichever he likes has nothing to do with me.
英语六级词汇whatever, whoever, whichever还可连接让步状语从句，相当于no matter what/who/which
argosy
Whatever (=no matter what) he has done, I can forgive him.
但以下情况往往必须用it作形式主语，主语从句一般不能放在句首。
橡皮擦用英语怎么说a. It doesn’t matter whether he likes or not.
b. It’s said that the highway will be open to traffic next year.
c. Is it likely that it will snow in the afternoon?
d. It turned out that he was right.
all by mylfe. It happened that he took the same train.
主语从句不在句首，可以用if代替 whether, 但如若在句首，只能用whether，而不能用if.
a. It’s not clear to me whether ( if ) she likes to join our discussion.
b. Whether she likes to join our discussion is not clear to me.
(3) 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引导的强调句句型的结构为：It is/was+被强调部分+that引导的从句（如果被强调部分是人，也可用
who代替that），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
