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表语从句用法详解
1. 表语从句只能置于主句后，主句的动词只能是连系动词。名词性从句在系动词后作表语时被称为表语从句。如：
① The problem is how we can get the things we need.
问题是我们怎样能弄到我们需要的东西。
(how 在表语从句中充当方式状语)
② The scissors are not what I need.
这把剪刀不是我所需要的。
(what在表语从句中充当宾语)
2. 注意：“That is why...”是常用句型，意为“这就是……的原因/因此……”，其中why引导的名词性从句在句中作表语，该句型通常用于针对前面已经说明过的原因进行总结。
辨析：
1)"That is why...”与“That is the reason why...”同义，但“That is the reason why...”中why引导的是定语从句，例如：
That is (the reason) why I cannot agree. 这就是我不能同意的理由。
(2)“That is because...”中从属连词because引导的名词性从句在此作表语，意为“这就是为什么……/因为……”。
“That is because...”指原因或理由，“That is why...”则指由于各种原因所造成的后果， 例如：
He did not see the film last night. That is because he had to help his little sister with her homework. 昨天晚上他没有去看电影，那是因为他得帮助他的妹妹做作业。
He had seen the film before. That is why he did not see it last night. 他以前曾看过那部电影，因此他昨天晚上没有去看。
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表语从句中what和who的用法
导语： 表语从句在一个 复合句中，从句作的是主句的表语成分。下面我为您收集整理了英语表语从句的用法，希望对您有帮助!
表语从句的定义：
A. 表语从句就是用一个句子作为表语。说明主语是什么或者怎么样，由名词、形容词或相当于名词或形容词的词或短语充当，和连系动词一起构成谓语。
例句：The problem is when we can get a pay rise. 问题是，当我们可以得到加薪。
B. 连接表语从句的连接词有：that, what, who, when, where, which, why。例句：
He has become what he wanted to be ten years ago.
他已经成为了他10年前想成为的。
She has remained where I stood yesterday for an hour.
她一直在我昨天站的地方站了一个小时。
His suggestion is that we should stay calm.
他的建议是，我们应该保持冷静。
The question is when he can arrive at the hotel.
问题是，他什么时候可以到达酒店。
表语从句的.注意事项：
A. 表语从句一定要用陈述语序。
False: The question is when can he arrive at the hotel.
Right: The question is when he can arrive at the hotel.
B. 不可以用if，而用whether连接表语从句(as if 例外);
引导宾语从句时可以互换if/whether，位于介词后要用whether;
位于句首时要用whether;
引导表语从句，主语从句，同位语从句时要用whether。
False: The question is if the enemy is marching towards us.
Right: The question is whether the enemy is marching towards us.
Right: It looked as if he had understood this question.
C. 不像宾语从句，在有表语从句的复合句中，主句时态和从句时态可以不一致。
Right: The question is who will travel with me to Beijing tomorrow.
Right: The question is why he cried yesterday.
D. that在表语从句中不可以省掉。
表语从句的基本用法：
表语从句只能置于主句之后，而主句的动词只能是联系动词。
名词性从句在be等系动词后作表语时被称为表语从句，例如：
The problem is how we can get the things we need. 问题是我们怎样能弄到我们需要的东西。(how 在表语从句中充当方式状语)
The scissors are not what I need. 这把剪刀不是我所需要的。(what在表语从句中充当宾语)
What I told him was that I would find him a good play. 我告诉他的是我会给他找个好剧本。(what在主语从句中作直接宾语，that作为表语从句的引导词在该表语从句中不充当句子成分，不能省略)
That is what I want to tell you. 那就是我想要对你讲的。(what在表语从句中充当直接宾语)
That is why she failed to pass the exam. 那就是她考试不及格的原因。(why在表语从句中充当原因状语)
注意：“That is why...”是常用句型，意为“这就是……的原因/因此……”，其中why引导的名词性从句在句中作表语，该句型通常用于针对前面已经说明过的原因进行总结，又如：That is why you see this old woman before you know, Jeanne. 珍妮，这就是现在这个老太婆出现在你面前的原因。(前文提到Jeanne对老妇人显得苍老憔悴深感诧异，说话人对她讲述了其中的原因之后，用这一句来进行概括)。
下面是两个与“That is why...”形式相似的结构，它们与“That is why...”结构之间的关系要能够辨析清楚：
(1)“That is why...”与“That is the reason why...”同义，只不过从语法结构上讲，“That is the reason why...”中why引导的是—个定语从句，将其中的the reason去掉则与“That is why...”结构一样，例如：
That is (the reason) why I cannot agree. 这就是我不能同意的理由。
(2)“That is because...”句型中从属连词because引导的名词性从句在此作表语，这也是个常用句型，意为“这就是为什么……/因为……”。“That is because...”与“That is why...”之间的不同在于“That is because...”指原因或理由，“That is why...”则指由于各种原因所造成的后果， 例如：
He did not see the film last night. That is because he had to help his little sister with her homework. 昨天晚上他没有去看电影，那是因为他得帮助他的妹妹做作业。(第一句话说明结果， 第二句话说明原因)
He had seen the film before. That is why he did not see it last night. 他以前曾看过那部电影，因此他昨天晚上没有去看。(第一句话说明原因，第二句话说明结果)
英语八大从句类型与用法总结PPT
根据从句语法功能的不同可分为：主语从句、表语从句、宾语从句、同位语从句、定语从句和状语从句6类。
1、主语从句
主语从句就是作主语的从句。它的连接词有连词、连接副词、连词代词。主语从句放在句首时，句子显得很笨重，因此常用it作形式主语，而将真正的主语后置，比如：
It is a pity that you have missed such a wonderful concert.
真遗憾你错过了这么精彩的一场音乐会。
2、表语从句
表语从句就是作表语的从句。它的连接词有连词、连接副词、连词代词等。
比如：
My idea is that we meet at the bus stop.
我的想法是我们在公共汽车站会面。
3、宾语从句
宾语从句就是作宾语的从句。它的连接词有连词、连接副词、连词代词等。
比如：
She said that she would drop maths.
她说她要放弃数学。
4、同位语从句
同位语从句就是作同位语的从句，它的连接词有连词、连接副词等。
The fact that everyone loves beauty is common sense.
人人爱美是常识。
5、定语从句
定语从句就是作定语的从句。定语从句主要修饰、限定、描绘名词，有时修饰代词，放所修饰词后边。
比如：
The girl who wears a new dress is my daughter.
那个穿新衣服的女孩是我的女儿。
6、状语从句
状语从句就是作状语的从句。在复合句中修饰主句中的谓语动词、形容词或副词，起状语作用的从句叫作状语从句。
比如：
Soon after he jumps his parachute will open.
他跳伞之后，降落伞就会打开。
表语从句because的用法
表语从句用法小结 一、表语从句的定义： 表语从句放在连系动词之后，充当复合句中的表语。 二、表语从句的构成： 关联词+简单句 三、引导表语从句的关联词的种类： 1. 可接表语从句的连系动词有be，look，seem，sound，appear等。 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。 At that time，it seemed as if I couldn't think of the right word. 当时，我似乎怎么也想不出一个恰当的字眼来。 2. 从属连词whether，as，as if / though引导的表语从句。 He looked just as he had looked ten years before. 他看起来还与十年前一样。 It sounds as if someone is knocking at the door. 听起来好像有人在敲门。 3. because，why引导的表语从句。 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） what引导的主语从句表示结果或名词reason作主语时，后面的表语从句表示原因时要用that引导，不宜用because. The reason why I was sad was that he didn't understand me. 我难过的原因是他没有理解我。 4. 连接代词who，whom，whose，what，which，whoever，whatever，whichever 连接副词 where，when，how，why The problem is who we can get to replace her. 问题是我们能找到谁去替换她呢。 The question is how he did it. 问题是他是如何做此事的。 That was what she did this morning on reaching the attic. 那就是她今晨上了阁楼干的。 5. 从属连词that The trouble is that I have lost his address. 麻烦是我把他的地址丢了。 6. 使用虚拟语气的表语从句 在表示建议、劝告、命令含义的名词后的表语从句，谓语动词需用“should+动词原形” 表示，should可省略。常见的词有：advice，suggestion，order，proposal，plan，idea等。 My suggestion is that we （should） start early tomorrow. 我的建议是我们明天一早就出发。 四、应注意的问题： 1. 连系动词be，appear，seem，look等之后可以跟表语从句。 It was because he didn't pass the exam. 那是因为他没有通过考试。 It seems（that）he was late for the train. 看来他没搭上火车。 It appears that she was wrong. 看来她错了。 It seems to me that we should answer for this. 在我看来，我们似乎应该对此事负责。 It appears to her that he wants to teach us all he has. 在她看来，他似乎要把他所会的都教给我们。 2. 引导表语从句的引导词有以下几类。 1）wh-疑问词 My question is who left. 我想问的是谁离开了。 What I wonder is when he left. 我想知道他是何时离开的。 That's what he wants. 那是他想要的。 This is where they once lived. 这就是他们曾经住过的地方。 That is why he didn't come here. 这就是他为何没到这儿来的原因。
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