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表语从句是什么
就是把表语用句子代替!
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.
2）whether
My question is whether he left（or not）.我的问题是他是否离开了.
注：if不能引导表语从句.
3）that
The fact is that he left.事实是他离开了.
注：引导表语从句的连词that间或可以省略.
The truth is（that）I didn't go there.事实是我没去那儿.
4）because,as,as if,as though
It's just because he doesn't know her.这是仅仅因为他不认识她.
Things are not always as they seem to be.事物并不总是如其表象.
He looks as if he's tired.他好像累了.
as的从句用法总结主从句什么时态
AS在从句中的用法小结
一.As在各种状语从句中的用法:
1. AS用于时间状语从句中,表示从句动作与主句动作同时发生, “边….边….”,而且主要指一段时间,但有时候和when一样也可指一点时间。
They shouted slogans as they passed the square
2.As用于原因状语从句中,表示的原因语气较弱,其原因多是对方所知道的,他引出的原因状语从句常常置于句首。
As he wasn’t ready in time, we went to the bar without him.
3.AS用于让步状语从句中，常常被转换成一个部分倒装结构，含有强调的意味。
1）Small as (=though) the stars appear, they are really large bodies. 2）Tired as she was, she continued to prepare for her lecture tomorrow. 4.AS引导方式状语从句时，意思是“如同”、“就像”（in the same manner that…..）,可以修饰动作和状态。
例如：Air is to man as water is to fish. 二．AS在定语从句的用法
1.AS引导限制性定语从句时，主要用在“such….as”,”the same…as”的结构中，可倒替先行词是人和物的名词.在“the same…as”的结构中as 也可以用that来代替
1）Let’s discuss only such questions as concern us!(as作主语) 2）I have never seen such kind of people as they are.(as作表语) 3）This is the same scarf as/that I have bought in HK.(as作宾语)
2.AS引导非限制性定语从句时，代替整个主语，对其进行说明。该从句的位置比较灵活，可位于主句前面或者插在主语中间，或者位于主句后面。常常由逗号将其主句隔开。“正如….” “正像….” 1）She is a southener,as(=which) I know her accent.(as代替前述句在从句中作宾语) 2）As was usual with the old man,he went out for a walk with his dog after dinner. (as代替后述句在从句中作主语)
as的用法灵活，词义繁多，特别是在复合句中更能体现其用法的多样性和灵活性，但如果同学们能正确掌握as的高考资源网词性和词义，是不难掌握其用法的。 一、as用作关系代词引导定语从句
1. as 引导非限制性定语从句，一般不指代某个具体的名词或代词，而是代表整个主句或主句的一部分。这种从句可放在主句之前，也可以放在主句之后，有时还可以放在主句的中间。如：
As is reported in the newspapers, talks between the two countries are making progress. 正如在报纸上所报道的，两国间的谈判有所进展。
Grammar is not a set of dead rules, as has been said above. 如上所说，语法不是一套死条文。
Spiders are not insects, as many people think, nor even nearly related to them. 蜘蛛不是昆虫，尽管许多人都这样认为，它甚至与昆虫几乎没有联系。
2. as 引导限制性定语从句，主要用于the same„as（与„„相同），such„as（像„„一样），as„as（与„„一样）。如： She knew he felt just the same as she did. 她知道他的感受和她一样。
Such a man with a good temper as Mr. Li is is easy to get along with. 像李先生这样好脾气的人是容易相处的。
He smokes as expensive a cigarette as he can afford. 他抽一种他买得起的最贵的烟。 二、as作为从属连词引导时间状语从句
表示“当„„的时候”或“一边„„一边”，强调主句的动作和从句的动作同时发生。如： I saw him as he was getting off the bus. 当他下公共汽车的时候我看见了他。 The boy was singing a popular song as he was bicycling. 这男孩边骑车边唱歌。 As she grew older, she became less active. 当她长大一点的时候，就变得不那么活泼了。
三、as作为从属连词引导原因状语从句
as 引导的原因状语从句常放在主句前，表示“因为，由于”。如：
As she is a model teacher, she gives a good example to others. 因为她是一名模范教师，她给其他人树立了一个好的典范。
As he wasn’t ready in time, we went to the cinema without him. 由于他没有及时准备好，我们就去看电影了，没有等他。w.w.w.k.s.5.u.c.o.m
三、as作为从属连词，引导让步状语从句
as引导让步状语从句比较特别，它要求将主语和谓语或谓语的一部分倒装。如： Old as he is, he is still full of energy. 尽管年纪大了，但他依然精力充沛。 Try as she may, she never succeeds. 尽管她很努力，但总是不成功。
Much as I admire Mr. Wang as a poet, I don’t like him as a man. 尽管我喜欢王先生的诗歌，但我不喜欢他的为人。
注：当倒装后置于句首的名词为单数可数名词时，习惯上不带冠词。如： Boy as he was, he was made king. 尽管他还是个孩子，却被立为国王了。 四、与其他词搭配使用构成从属连词引导从句
1. as if / as though。表示“好像，仿佛”，引导表语从句或方式状语从句。如： It looks as if / as though it is going to snow. 看起来要下雪啦。
He looks as if / as though he had seen a ghost. 他的脸色看起来好像他看见了鬼。
He talks as if /as though he knew everything about it. 他说话的口气好像他已经全部都知道了。
2. as [so] long as。“只要”，引导条件状语从句。如：
As [So] long as you can keep away from them, you will be safe. 只要你能远离他们，你就安全了。
I’m happy as long as you are happy. 只要你幸福，我就感到幸福了。 3. as [so] far as。表示“在„„的范围内”，引导限制状语从句。多用于下列结构：as [so] far as I know（据我所知），as [so] far as I can see, as [so] far as I’m concerned（依我看）。如： As [So] far as I know, the couple have been abroad for about five years. 据我所知，这对夫妇已经出国约五年了。
There’s only one thing to be done now, as far as I can see. 依我看。现在只有一件事情要做。
4. as soon as。表示“一„„就”，引导时间状语从句。如：
As soon as he got off the plane, he telephoned her girl friend. 他一下飞机就给他的女朋友打了个电话。w.w.w.k.s.5.u.c.o.m
He started as soon as he received the news. 他一得到消息就出发了。
总之，由于as的用法复杂，同学们在学习时一定要注意比较其在不同句子中的作用，判断其连接的是什么样的从句，多做一些关于相关练习，这样便可掌握其用法了。
as引导表语从句的困惑
as 是一个多词性多词义的词汇，你所列出的例句中的 as 是代词，用来指代前述的或要提到一个事实，意思是 “上述的这一点” 或 “正如后面要提到的这一点”。语法上把它归类为关系代词。与其他关系代词不同的是，as 指代的是一个句子或一个短语，而不是一个先行词；as 引导的从句不仅可以作非限制性定语从句，还可以用作表语从句。你所列举的句子多数是后一类。
用作非限制性定语从句
The full text reads as follows.
—as指代the fulltext.
As is well known，we love peace and hate invasion. 众所周知, 我们热爱和平,憎恨侵略.
—as指代we lovepeace and hate invasion
用作表语从句
Things are not always as they seem to be
—as指代things arenot always (like that)，因此可改写为things are not always like that which they seem to be
Every idea we have is as it were copied from what we sense orexperience.（as it were 表示虚拟语气）
—as 指代Every ideawe have，可以改写为Everyidea we have is like that which we have were copied from what we sense orexperience
I am as I was
—as 指代I am like that，可改写为 I am like that which I was.
Perhaps that is as it should be for a film set in Iraq.
—as指代that is，可改写为Perhaps that is like that which should be for a film set in Iraq.
That's just as it should be.理当如此
—as 指代 That'sjustlike that which should be
事实上，“as it + 系动词”已经是一种习惯用法，因此上面的改写都是多余的。
as it is 照现在的样子
as it was 一如既往
as it seem to be 正如看起来的样子、
as it should be 正如本来的那样
你好,李焕英 电影
as 可以引导表语从句，如: He looked just as he had looked ten years before.这个as在表语从句中不作成分。在薄冰著的英语语法书中叫做独立成分。
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