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表语从句because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)
什么是表语从句
【二】表语从句 ：表语从句的定义：表语从句在复合句中作主句的表语.表语从句和主语指同一内容,它对主语进行解释、说明,使主语的内容具体化.
表语是用来说明主语的身份、性质、品性、特征和状态的,表语常由名词、代词、数词、动词过去分词、动词的-ing形式、副词、介词短语、形容词、不定式和从句等来充当.
Lyne is an excellent student Henry was an American businessman
Henry met an American businessman The person stood in front of you just now ismy headmaster.
I didn’t know that it was you at that time. The door remained closed.
Mary’s daily job is cleaning the house. The house is not only large but also beautiful.
When I went to your house, you were out. No one was in the dorm, when shearrived.
My job is to teach you English. Thereason why he came late was that his clock didn’t work.
Position (位置)表语常位于系动词（be等词）之后,与主语共同构成主--系--表结构 (Subject-Predicative structure) 的句子.
Linking Verbs (连系动词)
除动词be以外,还有一些后面可接表语的特殊连系动词,如：look, smell, taste, sound, feel, fall, come, go（变成…）, become, grow（渐渐地变化）, turn(变成,一般用于颜色), appear, seem, get, keep, remain, stay等.
一、表语从句定义：表语从句的定义：表语从句在复合句中作主句的表语.表语从句和主语指同一内容,它对主语进行解释、说明,使主语的内容具体化.
The question is who will do it.
表语从句放在连系动词之后,充当复合句中的表语.
二、表语从句构成
（系动词） +引导词 +简单句
His suggestion is that we should stay calm That is why she was late.
三、引导表语从句的关联词
【1】从属连词that,whether；that 在表语从句中不充当任何句子成分,也没有任何意义.
The trouble is that I have lost her address.
麻烦是我把她的地址弄丢了.
My question is whether he left ( or not ).
我的问题是他是否离开了.
The question is whether weshould ask them for help.
The trouble is that he hasnever done the work before
The fact is that he hasn’t yet recover from illness.
The reason why he has to go is that his mother is ill inbed.
比较 that在定语从句中的用法.
There are some filmsthat I’d liketo see.
She is the onlystudent thatknows French.
结论:that 在引导定语从句时,指事物,也可指人,
在从句中作主语或宾语,作宾语时常可省略.
【2】.从属连词as, as if / though引导的表语从句
由as if 引导表语从句时要注意语态.若从句表示与现在事实相反,谓动用be 动词要用were
与过去事实相反用 had +过去分词
Li Lei is now in a new jacket. He looks as if he were an Americanboy.
The girl is giving us a vivid description of the moon. It seems as if shehad been to the moon many times.
He looked just as he had looked ten years before. It sounds as if someone is knocking at thedoor.
It looks as if it were going torain.
whether在表语从句中表是否 ,但不充当句子的成分.if 不能引导表语从句.如:
What the doctor really doubts is whether mymother will recover from the serious disease soon
【3】because, why 引导的表语从句
(1) That’s because he didn’t understand me.那是因为他不理解我.(强调原因）
(2) That’s why he got angry with me 那正是他对我生气的原因.（强调结果）
4.连接代词who, whom, whose,whoever, what,
whatever, which,whichever 引导表语从句
(1) The problem is who we can get to replace her.问题是我们能找到谁去替换她呢.
Guilin is not whatit used to be. What shewants to know is which dressshe should buy.
The question is what caused the accident. That mountain is not what it used to be.
What he told you was what had beendiscussed at the meeting.
【4】连接副词where, when, how
The question is how he did it.问题是他如何做此事的.That is where he was born. 那就是他出生的地方
That is where Lu Xun used to live. That is why he didn’t pass the exam.
四. 使用虚拟语气的表语从句(if不可以引导表语从句)
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等.
My suggestion is that we (should) start early tomorrow.
The question is whether we will have our sports meet next week.
The reason why he failed is that he was too careless.
The problem is who we can get to take the place of John.The question iswhen he can arrive at the hotel.
The question is whether the enemy is marching towards us. It looked as ifhe had understood this question.
The question is who will travel with me to Beijing tomorrow. The question is why hecried yesterday.
注意点1：if 不能引导表语从句
注意点2：主句主语为reason, 只能用that引导表语从句,不可用because.
注意点3：如果从句是特殊疑问句,用陈述句语序
A：表语从句一定要用陈述语序
B 不可以用if,而用whether 连接表语从句(as if 例外）.
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.
什么是表语从句
表语是英语区别于汉语所特有的一种词类，是起表述作用的句子成分，它常位于系动词之后，用来说明主语的身份、性质、品性、特征和状态。表语必须和系动词一起构成系表结构，作为句子的复合谓语。表语通常由名词、形容词、介词短语、不定式、形容词化的现在分词或过去分词以及从句来充当。
例：
1、Africa is a big continent.(名词作表语)
2、Our next step was to prepare raw materials.（不定式作表语）
3、The patient is in danger.（介词短语作表语）
4、Who's your best friend?（代词作表语）
5、He is old but he is healthy.(形容词作表语)
扩展资料：
表语从句：表语从句位于主句系动词之后，可分为两类：be+that型从句和be+疑问词型从句。
1、be+that型从句
例：The fact is that we have no idea to solve this problem.事实就是我们没办法解决这个问题。
The reality is that the party must be cancelled because of the storm.现实就是因为暴风雨这个聚会必须得取消了。
2、be+疑问词型从句
例：The question is whether they will help us.问题是他们会不会帮我们。
The problem is why she didn't go back home directly.麻烦就麻烦在为什么她没直接回家。
3、表语从句使用陈述语序。
例：The question is when he can arrive at the hotel.问题是他什么时候能到酒店。
主语从句和表语从句属于什么
主谓宾,定状补.表语从句就是修饰名词的一个句子,一般THAT引导.
1． 定义：用作主语的从句叫做主语从句.
2． 构成：关联词+简单句
3． 引导主语从句的关联词有三类：
(1) 从属连词that.如：That they were in truth sisters was clear from the facial resemblance between them.
很明显,她们确是亲姐妹,她们的脸型很相似.
(2) 从属连词whether.如：
Whether he’ll come here isn’t clear.他是否会来这里还不清楚.
(3) 连接代词who,whom,whose,what,which,whoever,whatever,whichever
连接副词 where,when,how,why.如：
What she did is not yet known.她干了什么尚不清楚.
How this happened is not clear to anyone.这事怎样发生的,谁也不清楚.
Whoever comes is welcome.不论谁来都欢迎.
Wherever you are is my home ---- my only home.你所在的任何地方就是我的家----我唯一的家.
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