定语从句中只能用that的情况
英语定语从句中that和which的区别有哪些？
【导语】很多同学可能都会觉得在使⽤定语从句的时候，有时不知该选择that还是which作为引导词。
那么，今天和⼀起来了解下定语从句中that和which的区别，以下内容由整理发布，欢迎阅读参考！更多相关讯息请关注！⾸先，that和which在从句⾥都可以做宾语和主语，做宾语时可以省略。
在定语从句中,有种说法叫"关宾省",意思是关系代词在限制性定语从句中作宾语可以省略,不管是that，which，还是whom。
但是which能引导⾮限制性定语从句，that则不⾏。
其次，记得以下只能⽤that的⼏种情况：1. 当先⾏词为all, much, little, none及由any, every, some, no所构成的复合不定代词时。
如：We should do all that is useful to the people. 我们应该做⼀切有益于⼈民的事情。
Please tell me anything that you know about the matter. 有关此事，凡是你所知道的请告诉我。
2. 当先⾏词被any, few, little, no, all, much, some等词修饰时。
如：You can take any seat that is free. 任何空着的座位你都可以坐。
There is little work that is fit for you. ⼏乎没有适合你的⼯作。
3. 当先⾏词为序数词或被序数词所修饰时。
如：When people talk about the cities of China, the first that comes to my mind is Beijing. ⼈们谈论起中国的城市的时候，我⾸先想到的是北京。
This is the fourth film that has been shown in our school this term. 这是我们校本学期放映的第四部电影。
定语从句用that的八种情况
定语从句用that的八种情况1. 先行词是不定代词：something, anything, nothing, everything, someone, anyone, no one, everyone, somebody, anybody, nobody, everybody, 后面用that引导定语从句。
例句：I have something that you might be interested in.2. 先行词是序数词或最高级形容词：first, second, third, last, only, best, worst, 后面用that引导定语从句。
例句：This is the best book that I have ever read.3. 先行词是all, few, many, some, any, none, most, little, much, every, 后面用that引导定语从句。
例句：All that glitters is not gold.4. 先行词是the only, the very, the same, the last, the next, the following, the best, the worst, the most, the least, the first, 后面用that引导定语从句。
例句：This is the same car that I saw yesterday.5. 先行词是形容词最高级，或在形容词最高级之前有冠词the修饰时，后面用that引导定语从句。
例句：He is the most talented musician that I have ever seen.6. 先行词被形容词或名词所有格所修饰时，后面用that引导定语从句。
例句：This is the house that John built.7. 先行词是被强调的词时，后面用that引导定语从句。
定语从句用that不用which的情况口诀
定语从句用that不用which的情况口诀以下是关于定语从句中“that”和“which”使用情况的口诀，帮助你记忆在哪些情况下应使用“that”而不是“which”：先行不定代，the very/only/first，有高、序，some，all，much，few；固定搭配记清楚，谁作宾语that为；两个定从一起来，不要which要who/whom。
这个口诀的详细解释如下：1.“先行不定代”：先行词是不定代词或者受不定代词修饰的时候，定语从句用that，不用which。
例如：All that is needed is a supply of oil. 所需的只是供油问题。
2.“the very/only/first”：先行词是the very、the only、the same、the first等修饰词时，定语从句用that，不用which。
例如：This is the very book that I am looking for. 这正是我在找的书。
3.“有高、序”：先行词有形容词最高级或序数词(包括last)修饰时，定语从句用that，不用which。
例如：This is the most beautiful flower that I have ever seen. 这是我见过的最漂亮的花。
4.“some，all，much，few”：当先行词被all、every、little、few、no、any、some等代词修饰时，定语从句用that，不用which。
例如：I've eaten all the food that you gave me.我已经把你给我的食物都吃完了。
5.“固定搭配记清楚”：有一些固定搭配如the way that、the reason that等习惯上要用that来引导定语从句。
例如：I don't like the way that he speaks to me. 我不喜欢他跟我说话的方式。
定语从句关系代词只用that的四种情况
定语从句关系代词只用that的四种情况定语从句是英语句子的一种形式，用来描述或定义名词。
关系代词在定语从句中充当连接词，将定语从句引入主句中，起到结构完整化的作用。
在定语从句中，关系代词的种类有很多，其中较为特殊的是只用“that”的情况，本文将详细介绍这种情况下的用法及注意点。
一、定义关系代词”that“是用来连接定语从句和主句的重要连词，在英语中十分常见。
它的形式既可以作主语也可以作宾语，常用于定语从句中，引导一个话题在从句中被进一步解释。
二、使用情况在英语定语从句中，that只有在严格的语法环境中词法才是唯一的选择，情况包括以下四种。
1.介词之后：当先行词是介词时，关系代词只能用that。
例如，“the book that I am reading”中的that是引导定语从句的关系代词。
假如在这个句子中，你用which来代替that，那么这个从句仍然可以理解，但这样使用是错误的。
正确：The book that I am reading.错误：The book which I am reading.2.形容词之后：如果形容词修饰名词，其中包含有定语从句，而先行词又在从句里作宾语，就必须使用that。
例如，“This is the man that I saw on TV yesterday”。
正确：This is the man that I saw on TV yesterday.错误：This is the man which I saw on TV yesterday.3.最高级别形容词之后：当最高级别形容词修饰的名词在定语从句中作先行词时，只能用that，而不用which或者who。
例如，“This is the best d ay that I've ever had in my life”。
正确：This is the best day that I've ever hadin my life.错误：This is the best day which I've ever had in my life.4.不定代词之后：不定代词（如something，anything，nothing，everyone，everybody等）以及不定副词（如somewhere，anywhere，nowhere等）后面的定语从句，只能用that。
定语从句中只用that的特殊情况小析
定语从句中只用 that的特殊情况小析摘要：近几年来，高考英语针对定语从句的知识点频繁出考题，其中以which和that的特殊情况最为常见。
本文就定语从句中that的几种特殊用法作出讲解，希望同学们能掌握并学会巧妙运用。
关键字：高考；定语从句；特殊用法一、那些只能用that引导的定语从句1.当先行词是不定代词时英语中有一类代词，它们没有明确的指代对象，只表达一个模糊的概念，于是我们把它们叫做不定代词，如all, much, little, something, everything anything, nothing, none, the one等等，这样的情况下，其后的定语从句的引导词只能用that。
那么，这是什么原因呢？这要从that和which本身的概念上说起，我们最初接触这两个单词的时候，参考翻译得知，that是“那一个”，而which是“哪一个”，由此，我们是不是可以这样说，which表示哪一个的话，本身是具有选择倾向的，而that表示那一个，本身就是具有特定指代倾向的。
在明白这两个概念之后，再回过头去看不定代词做先行词，它们都是没有特定指代的，也就不具备可选择性，比如all，翻译为“所有”，既然都是所有了，那就完全不用选择了；再比如everything，翻译为“每一件事”或者“每一样东西”，同样也具有全指代的特性，因此也不用选择；最后，看到none，翻译为“一个都没有”，既然都没有了，我们还选什么呢？因此，在这样的不定代词作为先行词，本身就没有特定指代的情况下，我们只用that，不用which。
例：Do you have anything that you want to say for yourself?This is all that I have done for him.1.当先行词被only/any/few/little/no/all/very等词修饰时带着方才的概念，我们再来看看这种情况，其中的any、few、little、no、all都属于不定代词类，不论它们是自己做先行词，还是去修饰先行词，都统一依照之前的概念，使用that引导定语从句。
定语从句中关系词必须用that的情况
学习好资料欢迎下载定语从句中关系词必须用that的情况：1. 被修饰的先行词是不定代词all，much，something，everything，nothing，none，the one等时，（注意：表示人的不定代词即可用that也可用who/whom）如：Anyone who/that doesn’t like this film must tell me.Do you have something that is very difficult to understand?All（that）I can do is to give him some hope.2. 被修饰的先行词还有一些特定意义的修饰词，如：the only、the very、just the、the right、any、every、no、all、much、many、little、few等，如：The only thing（that）we know is that the universe is very big.Any bus that can go there is OK.This is just the/the very/the right book I am looking for.There are few cars that are driving slowly.Every car that has a high price is worth what it costs.3．句子中出现过which或who之类的词，为了避免重复，要用that，如：Who is the man that is speaking?The factory which produces shoes that are very good has gone bankru4．关系代词在从句中作表语时，多用that。
如：She is not the girl that she was three years ago．5．先行词被形容词最高级、only等修饰时，应用that。
(完整版)定语从句中只能用that的情况
定从中只用That不用which的情况1.在there + be 的句型中，句子的主语是先行词，而且又是物。
例如：There are two novels that I want to read.我要读的有两本小说。
There is no work that can be done now. 没有什么工作现在能做的了。
2.先行词是最高级或被最高级修饰时3.以Here is (are)开头的句子时。
例如：Here is a film that will move anyone.这是一部将使任何人受感动的电影。
Here are two books that I will buy.这是我要买的两本书。
4.It is (high)time +定语从句中。
例如：It is time that we should have a rest.我们应该休息了。
It is high time that they started out. 他们该动身了。
5.当先行词是way等词时，关系代词用that或者in which在定语从句中作方式状语时，在口语中，常可省略。
例如：This is the way that my father did this work.这就是我父亲做此工作的方式。
She admired the way in which I answered the questions.她羡慕我回答问题的方式。
6.在双重限定性定语从句中，如果一个从句用who或者which引导时，那么另一个从句用that引导。
例如：He is the student that I have ever see who can jump highest.他是我曾经看到过跳得最高的学生。
My brother studies in the school which is the most beautiful in our city that isn’t far from here. 我的弟弟在我们的城市最美丽的学校读书，并且离这儿不远。
高中定语从句讲解：who,whom,that的特殊用法
高中定语从句讲解：who,whom,that的特殊用法高中定语从句讲解:who, whom, that的特殊用法定语从句讲解：who, whom, that的特殊用法：一、只能用that的情况，先行词为everything，all，little，much等不定代词时;先行词被all，every，no，any，some，little，much，one修饰时;先行词被the only，the very，the same，the last修饰时;先行词被序数词或形容词最高级修饰时;先行词是be的表语或there be 的主语时;先行词有人又有物时;当主句是以who或which开头的特殊疑问句时。
二、which，that的用法1,which，that 用来指物(有六种情况只可用that而不用which) (用作主语、宾语，作宾语时可以省略)，例如：(1)The prosperity which/that had never appeared before took on in the countryside.农村出现了前所未有的繁荣。
(which/that在从句中作主语)(2)The package (which/that) you are carrying is about to come unwrapped.你拿那个包裹快要散开了。
(which/that在从句中作宾语)注：which在定语从句中指物，可作主语或及物动词或介词的宾语，作宾语时可省略;that在定语从句中既可指人又可指物，在定语从句中作主语、宾语和表语，作宾语时可省略，指人时，相当于who或whom，指物时，相当于which，作介词宾语时，介词不可提到that 前，当介词提前时，需要用which或whom来代替。
2、whose(只用作定语)“whose”表示谁(可以为人也可以为物)的(东西)例：A child whose parents are dead is called an orphan.双亲都死了的孩子叫做孤儿。
定语从句只用that情况及其练习
定语从句中：只用that而不用which的五种情况引导定语从句的关系代词有：that（指人或物），which（指物），who (指人）。
指人时可用that或who ；指物时可用that 或which ；但有时只能用that，不能用which。
常见的情况有下列五种：1）当先行词是：all , any , anything , everything , nothing the one, much, few, little或被它们修饰时。
例如：Is there anything that I can do for you有什么可以为你做的吗？All that can be done must be done .凡是能做的都必须做。
2）当先行词被形容词的最高级或序数词修饰时。
例如：That is one of the most interesting books that are sold in the bookshop .那是这家书店出售的最有趣的书之一。
The first thing that we should do is to get some food .我们该做的第一件事是弄点吃的。
3）当先行词有：the only , the very , the same , the last 等修饰时。
例如：My necklace is not the only thing that's missing .我的项链不仅是丢掉的东西。
4）当主句以who或which开头时，定语从句中引导词用that ,不用which 或 who 。
以避免重复。
例如：Who is the girl that is wearing a red coat正穿一件红色外套的女孩子是谁？5）当先行词既有人又有物时，用that 。
例如：The writer and his novel that you have just talked about are really well known .你刚才谈起的那位作家以及他的小说确实很着名。
(完整版)定语从句-用that而不用which的五种情况
定语从句用that而不用which的五种情况1、先行词为all much little everything anything nothing none few the one 等不定代词；例如：I mean the one that was bought yesterday.Is there anything that I can do for you?All that can be done must be done.2、当先行词被形容词的最高级或序数词修饰，或被the only , the very , the same , the last, any, few, little, no, all, one of等修饰时。
例如：That is one of the most interesting books that are sold in the bookshop.The first thing that we should do is to get some food.My necklace is not the only thing that's missing.3、当主句以who或which开头时，定语从句中引导词用that ,不用which 或who 。
以避免重复。
例如：Who is the girl that is wearing a red coat?4、当先行词既有人又有物时，用that 。
例如：The writer and his novel that you have just talked about are really well known.5. 先行词在主句中做表语或关系代词在从句中做表语时；It’s book that will help you a lot. My hometown is no long the place that it used to be.He is not the man that he used to be.。
定语从句只用that的八种情况
定语从句只用that的八种情况1. 当先行词是不定代词的时候就得用that 啦，比如说“All that glitters is not gold.”（发光的不都是金子呀。
）2. 先行词被序数词修饰的时候，那肯定得是 that 呀，就像“ The first thing that I want to do is to take a rest.”（我想做的第一件事就是休息一下。
）3. 先行词被形容词最高级修饰时，只能用 that 哦，例如“ This is the best movie that I have ever seen.”（这是我看过的最好的电影呢。
）4. 先行词既有人又有物的时候，不用that 还能用啥呢，像“ They talked about the persons and things that they remembered.”（他们谈论着他们记得的人和事呀。
）5. 当先行词被 the very，the only 等修饰时，那就是 that 没跑啦，比如“This is the very book that I am looking for.”（这就是我正在找的那本书哟。
）6. 当主句是以 who 或 which 开头的疑问句时，后面不也得是 that 嘛，像“ Who is the man that is standing there?”（站在那儿的那个男人是谁呀？）7. 当先行词在定语从句中作表语时，肯定得选 that 呀，例如“ China is not the country that it was.”（中国已不是过去的中国了。
）8. 当先行词是数词时，也得用 that 呀，像“ Three people died in the accident that happened yesterday.”（在昨天发生的事故中有三人丧生。
）我的观点结论就是：这些情况可都得记住呀，这样在使用定语从句的时候就不会出错啦！。
定语从句专题讲座(只能用that或which的情况)
定语从句专题讲座一、定语从句中，引导词只能用that，不可以用which的情况：a) 以something, everything, anything, nothing, the one, all等作被修饰词时，引导词只用that，不用which。
①Mr. Pan feels like teaching his students all (that) he knows.潘老师恨不得把他知道的一切都教给学生。
②There’s something (that) I don’t quite understand in your talk.在你的讲座中，有的东西我没有完全听懂的。
③The finger I put in the mixture(混合物) is not the one (that) I put into my mouth.我插入混合物中的手指并不是我放入嘴里的手指。
b) 当被定语从句修饰的词含有all, any, no, little, much, every, the only(唯一的), the very(恰恰；正)，just the…的时候，引导定语从句的引导词只用that。
① He had spent all the money (that) his mother gave him. 他把他妈妈给他的钱全花光了。
② If there are any clothes (that) you do want to buy, just let me know.如果有什么衣服你确实想买的话，直接告诉我。
③ China is no longer the country that it used to be. 中国不再是他以前的那个国家了。
④My purse is not the only thing that is missing. 失踪的东西不只是我的手提包。
⑤She is the very person that cares about you. 她恰恰正是关心你的人。
定从只能用that的情况
定语从句中只能使用that的情况1.当先行词为anything，everything，nothing等不定代词时，只能使用“that”。
例：Is there anything that I can do for you?(我能给你做点什么吗？)2.当先行词为all，any，much，many词时，只能使用“that”。
例：Tom told her mother all that had happened.(汤姆把事情的全部情况告诉了他的妈妈。
)3.当先行词是形容词最高级或被形容词最高级修饰时，只能使用“that”。
例：This is the most wonderful time that I have ever had. (这是我度过的最美好的时光。
)4.当先行词是序数词修饰时，只能使用“that”。
例：He was the first person that passed the exam.他是第一个通过考试的人。
5.先行词被the only，the very，the same，the last修饰时，只能使用“that”。
例：This will be the last chance that he can get.(这将会是他得到的唯一机会。
) He is the only person that can help you out.(他是唯一能帮你的人。
)6.先行词里同时含有人或物时，只能使用“that”。
例：They talked of things and persons that they remembered in the school.(他们谈论他们记得的有关学校的事和人。
)7.当主句是以who，which开头的特殊疑问句或先行词是who时，只能使用“that”。
例：Which is the book that he bought from the library yesterday?(哪本是你们昨天从图书馆借的书？)我们的家乡是柳州，这里山清水秀，人杰地灵，环境优美，请根据下列提示，完成作文。
定语从句系列只能用关系代词that引导的九种情况
定语从句系列:只能用关系代词that引导的九种情况人生底色看语文18-03-1200:48什么情况下，定语从句中只能用that？本文将解决这个问题。
为大家总结，只能用关系代词that引导的定语从句之九种情况。
在定语从句中，当先行词表示物的时候，引导定语从句的关系代词，可以用that, 也可以用which. 但是通常在以下几种情况下, 只能用that, 同学们在学习过程中要引起注意。
1.当先行词为all, much, none, something, nothing, everything, the one, few, little, many, anything等不定代词时。
例如：We should do all that is useful to the people. 我们应该做一切有益于人民的事情。
Is there anything that I can do for you?有什么需要我帮忙的吗？There’s nothing that can be said about it关于这件事，已没有什么可说的了。
Do you mean the one that you bought yesterday?你指的是昨天买的那个吗？2 当先行词被only, any, few, little, no, all, many, much等不定代词修饰时。
例如：I have finished reading all the books that I borrowed from the library. 我己经看完了所有从图书馆借来的书。
He has learned many English new words that the teacher taught him last week by heart.上周老师教的许多新英语单词，他都用心记住了。
The only thing that we can do was to wait. 我们唯一能做的事情就是等待。
只能用that，不能用which作先行词的情况
只能⽤that，不能⽤which作先⾏词的情况只能⽤that，不能⽤which作先⾏词的情况（1）先⾏词是不定代词或者先⾏词被不定代词所修饰时，关系代词通常只⽤that，不⽤which.例如：① That’s all that I know. 我知道的就这些。
② Is there anything that you want to buy in town？你有什么东西要在城⾥买吗？③ Nothing that the teacher does doesn’t influence his students. ⽼师所做的事情没有不影响到学⽣的。
（2）先⾏词被序数词、形容词最⾼级、 the only， the very， the last等修饰时，关系代词通常只⽤that，不⽤which.例如：① The first English novel that I read was Cities. 我读的第⼀本英⽂⼩说是《城市》。
② This is one of the most exciting football games that I have ever seen. 这是我见过的最激动⼈⼼的⾜球⽐赛之⼀。
③ This is the only thing that we can do now. 这是我们现在惟⼀能做的事情。
（3）先⾏词既有⼈⼜有物时，关系代词只⽤that，不⽤which.例如：① The scientist and his achievements that you told me about are admired by us all. 我们所有⼈都钦佩你告诉我的那位科学家和他所取得的成就。
② The foreign visitors spoke highly of the pioneers and their performances that they saw at the Children’s Palace. 外国游客⾼度赞扬了他们在少年宫所看到的少先队员以及他们的表演。
定语从句只用that情况及其练习。
定语从句中：只用that 而不用which 的五种情况引导定语从句的关系代词有：that （指人或物），which （指物），who (指人）。
指人时可用that 或who who ；；指物时可用that that 或或which which ；；但有时只能用that that，不能用，不能用which which。
常见的情况有下列五种：。
常见的情况有下列五种：1）当先行词是：all , any , anything , everything ,, nothing the one, much, few, little 或被它们修饰时。
例如：Is there anything that I can do for you ? 有什么可以为你做的吗？All that can be done must be done .凡是能做的都必须做。
2）当先行词被形容词的最高级或序数词修饰时。
例如：That That is one is one is one of the most of the most of the most interesting interesting interesting books books books that are that are that are sold sold sold in in the bookshop .那是这家书店出售的最有趣的书之一。
The first thing that we should do is to get some food .我们该做的第一件事是弄点吃的。
3）当先行词有：the only , the very , the same , the last 等修饰时。
例如：My necklace is not the only thing that's missing .我的项链不仅是丢掉的东西。
4）当主句以who 或which 开头时，定语从句中引导词用that ,不用which 或 who 。
that在定语从句中的用法总结
that在定语从句中的用法总结that在定语从句中的用法总结从句，即从属子句，是复句中具有分属地位的分句，它是一种绝大部分语言都有的语法结构。
在现代汉语的语法中，“从句”不作为专业术语被使用。
以下是店铺整理的that在定语从句中的用法总结，供大家参考借鉴，希望可以帮助到有需要的朋友。
that在定语从句中的用法1(1)不用that的情况(a) 在引导非限定性定语从句时。
(错)The tree, that is four hundred years old, Is very famous here.(b) 介词后不能用。
We depend on the land from which we get our food.We depend on the land that/which we get our food from.(2) 只能用that作为定语从句的关系代词的情况(a) 在there be 句型中，只用that，不用which。
(b) 在不定代词，如：anything, nothing, the one, all等作先行词时，只用that，不用which。
(c) 先行词有the only, the very,the same,the last,just修饰时，只用that。
(d) 先行词为序数词、数词、形容词最高级时，只用that,不能用which。
(e) 先行词既有人，又有物时。
(f) 先行词指物，在主句中作表语时.(g) 为了避免重复.(h)先行词是the way或the reason时，that可作关系副词，也可省略(i) 主句的主语是疑问词who /which时that在定语从句中的用法2首先、that既可以代指物，也可以代指人。
例1：Tom doesn’t like the birthday present that his father bought him.汤姆不喜欢他爸爸买给他的生日礼物。
定语从句只用that的几种情况
世纪金榜78页用动词适当形式 填空
• 1 that/which • 2 which/that • 3 that • 4 that • 5 whose • 6 which
改错
• 1 They rushed over to help the man his car had broken down.
2 先行词为all，填that
3 先行词为the most expensive watch，填that
4 先行词为the writer and his novel，填that
课时检测：1 单句语法填空
• 7that/不填 • 10 whose
把his改为whose
• 2 The noodles what I cooked were delici把owuhsa.t改为that、which
• 3 The village where she lives in is twen把tywhkeirleo改me为trthesat a、wawyh.ich
1当先行词为alleverythingeveryonenothingsomethingsomeonenoneanythinganyonelittlemuch等不定代词或先行词被这些词语修饰时mostbeautifulparkhavevisited当先行词是序数词形容词最高级或先行词被序数词或形容词最高级修饰时chattingonlythinginterestedhermost当先行词被theonlytheverythelast饰时可以翻译为唯一shetookphotographs当先行词既有人又有物时shanghai当先行词在定语从句中做表语时who当主语是以who或which开头的疑问句时为避免重复而用thatmostexpensivewatchhisnovel10whose78rushedovermanhiscarhadbrokendown
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只能用that 的情况：
1. 先行词为不定代词all, much, everything, nothing, none, the one
2. 先行词被only, any, few, little, no ,just, very, one of 修饰
3. 先行词被序数词或就是序数词时
4. 先行词是最高级
5. 先行词既是人又是物
6. 先行词是次数时two, ten, a hundred
7. 两从句一个已用which ，另一个用that,避免重复
8. 疑问词是who/which,宜用that
9. 主句there be
10. 被修饰部分为表语or 关系代词本身是定从的表语时：主+be+n./adj. ; 主+系+adj.
只能用which 的情况：
1. 介词后
2. 非限制性定从
3. 当关系词后带插入语时
只能用who 的情况:
1. 先行词为anyone, anybody, those, all, one, ones, they, he, people
2. 非限制性定从
3. There be
先行词为way 时，定从常用that, in which, how, that. that 可省
As 的用法：
正如……As 是关系代词，代替整个句子，在后面的句子中充当动词know 的宾语。
He was a foreigner, as I know from his accent.
如为限制定从，多用于the same…as, such…as…, as many/much as, so as
I have the same book as you (have).
Her attitude to him was quite the same as it had always been.
I live in the same house that he used to live in. I’m wearing the same shirt as you were yesterday.
非限制定从中，as 常至于句首。
As we all know, smoking is harmful to one’s health.
as 做主语
as is well known (to us)
as was mentioned before
as could be expected
as could be judged from her eyes
as may be seen from the book
as is recounted in his stories
as everyone could do
as often happens
as will be shown in fig.3
as has been pointed out
as has been explained
as is often the case
as (is) usual
He listed the names as follows (follows永远是单数)
as做宾语
as we all can see
as we all know
as it is
成分不重复
关系词省略：
1.非正式文体中
2.关系代词做宾语，常略
3.以the way为先的限制性定从常由in which/that引导，常略
4.The time when, the place where, the reason why中，when, where, why可略
不能用that的情况：
1.非限制定从
2.关系词前有介词。