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1、2023年高中英语语法主语从句用法汇总语法知识：表语从句用法汇总表语从句是名词性从句的一种，也是往往最令大家迷糊的一种,很多人都弄不清标语的概念，因而也弄不清表语从句的用法1.由关系代词型what引导That,s what I want to stress.这是我想强调的。That s what we are here for.我们来这里就为了这个。Fame and personal gain is what they re after.他们追求的是名利。He is no longer what he was,他已经不是以前的他了。2.由 as if/as though 弓 I 导It isn
2、 t as if you were going away for ever.又不是你离开不回来了。Now it was as though she had known Millie for years.现在好像她认识米莉已有好多年了似的。It is not as though we were poor.又不是我们家里穷。3.由 because 弓 I 导It is because I love you too much.那是因为我太爱你了。That s because you can t appreciate music.这是因为你不能欣赏音乐。If I m a bit sleepy,it s
3、 because I was upall night.如果我有点困，是因为一夜没睡。It s because I passed a slip of paper for John to Helen inclass.这是因为我在上课中替约翰传纸条给海伦。【注意】because可引导表语从句，但与之同义的since,as,for等也不用于引导表语从句。名词性从句之表语从句在复合句中充当表语。1.that在引导表语从句时无含义，不作成分，通常不省。1）表示事实、真理等的实际内容。The fact is that he is lying.The odds are that he will not do
4、it.2）表示某人的意见、信念等的实际内容。Our belief is that things will improve.The trouble is that we are short of money.2.whether引导表语从句（不可用if）His first question was whether holmes had arrivedyet.The question is whether people will buy it.3.连接代词引导的表语从句。This is what i want.The question is who can be chosen to be manag
5、er of thecompany.My question is which of them is better.4.连接副词引导的表语从句。The problem seemed how we could make him understandit.The question is where we should go.5.as if,as though引导的表语从句(常用虚拟语气)He looks as if he were angry.It looks as if its going to rain.表语从句的特殊引导词除了常见的五类引导词外，表语从句还有三类特殊引导词，这三类词引导词使得表语
6、从句有着不同于其他几种类型从句的特点，但因为知识点太细而容易被忽略。一.(just)as表 示 正如 ，经常与动词look/seem/appear搭配使用。eg.It seems just as something terrible happened.It looks as she is crying.二.as if/as though表 示 好 像 ，也 常 动 词 look/seem/appear搭配使用，asif/though后面的表语从句中的谓语动词一般采用虚拟语气形式，通常是该谓语动词的时态采用相应的过去时态。eg.It looks as if/as though she was a
7、ngry.Now it was as though she had known Millie for years.It isn,t as if you were going away for ever.三.becausebecause也可以引导表语从句，表原因，但since/as/for等同样表原因的词不可以用来引导表语从句。eg.It is because I love you too much.Its because I helped him to finish that project.复合句中的表语从句用法复合句指的是含有两个或更多的主谓结构的句子，关于复合句中的宾语从句，同学们了解多
8、少呢？下面一起来学习复合句中的表语从句用法：定义：表语从句放在连系动词之后，充当复合句中的表语.A可接表语从句的连系动词可接表语从句的连系动词有be,look,seem,sound,appear等.例句：China is no longer what she used to b e.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 rightw o r d.当时，我似乎怎
9、么也想不出一个恰当的字眼来。B as,as if/though引导的表语从句例如：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C because,why引导的表语从句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.例如：That s because he didn t understand me.那是因为他没有理解我。D使用虚拟语气
10、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.例如：My suggestion is that we(should)start early tomorrow.我的建议是我们明天一早就出发。表语从句放在连系动词之后，充当复合句中的表语。表语从句的构成：关联词+简单句引导表语从句的关联词的种类：可接表语从句的连系动词有be,look,seem,sound,appear等。China is no longer what she
11、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 rightword.当时，我似乎怎么也想不出一个恰当的字眼来。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
12、is knocking at the door.听起来好像有人在敲门。because,w h y引导的表语从句。Thats because he didnt understand me.那是因为他没有理解我。（Thats because强调原因）Thats why he got angry with me.那正是他对我生气的原因。（Thats 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 didnt understand me.我
13、难过的原因是他没有理解我。连接代词 who,whom,whose,what,which,whoever,whatever,whichever连接副词 where,when,how,whyThe 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。从属连词thatThe trouble is that I have
14、lost his address.麻烦是我把他的地址丢了。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。应注意的问题：连系动词be,appear,seem,look等之后可以跟表语从句。It was because he didnt pass the exam.那是因为他没
15、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。引导表语从句的引导词有以下几类。wh-疑问词My question is who left.我想问的是谁离开了。What I wonder i
16、s when he left.我想知道他是何时离开的。Thats 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 didnt come here.这就是他为何没到这儿来的原因。whetherMy question is whether he left(or not).我的问题是他是否离开了。注：i f不能引导表语从句。t h a tT h e f a c t i s t h a t h e l e f t.事实是他离开了。注：引导表语从句的连词t h a t间或可以省略。T h e t r u t h i s(t h a t)I d i d n t g o t h e r e.事实是我没去那儿。b e c a u se,a s,a s i f,a s t h o u g hI t s j u st b e c a u se h e d o e sn t k n o w h e r.这是仅仅因为他不认识她。T h i n g s a r e n o t a l w a y s a s t h e y se e m t o b e.事物并不总是如其表象。H e l o o k s a s i f h e s t i r e d.他好像累了。