1. 不用that的情况
(1) 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.
(2) 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
(1) 在there be 句型中，只用that，不用which。
(2) 在不定代词，如：anything, nothing, the one, all等作先行词时，只用that，不用which。
(3) 先行词有the only, the very,the same,the last,just修饰时，只用that。
(4) 先行词为序数词、数词、形容词最高级时，只用that,不能用which。.
(5) 先行词既有人，又有物时。
(6) 先行词指物，在主句中作表语时.
(7) 为了避免重复.
(8) 先行词是the way或the reason时，that可作关系副词，也可省略
(9) 主句的主语是疑问词who /which时
相关内容
定语从句规则中，that真的很重要！
1、当先行词是不定代词all, much, little, something, everything, anything, nothing, none等时。
●You should hand inall thatyou have.
你应该上交你所有的东西。
●Do you haveanything thatyou want to say for yourself ?
你有什么要为自己说的吗？
●Jim dideverything thatcould improve her grades.
吉姆做所有可以提高成绩的事。
2、当先行词被the only, the very, any, few, little, no, all等词修饰时。
●Singing isthe onlythingthatinterests Alice most.
唱歌是唯一爱丽丝感兴趣的事。
●This isthe verypersonthatIm waiting for.
这正是我要等的那个人。
●The onlythingthatwe can do is to give you some advice.
我们唯一能做的就是给你一些建议。
3、当先行词是形容词最高级或先行词的前面有形容词最高级修饰时。
●This isthe bestwaythathas been used against pollution.
这是应对污染的最好方式。
●This isthe mostinteresting filmthatI’ve ever seen.
这是我看过的最有趣的电影。
4、当先行词是序数词或它前面有序数词修饰时。
●This train isthe lastthatwill go to Suzhou.
这是去苏州的最后一辆火车。
●What isthe firstAmerican filmthatyou have seen？
你看过的第一部美国电影是什么？
5、当先行词既有人又有物时。
●Do you knowthe things and persons thatthey are talking about?
你知道他们在谈论什么人和什么事情吗？
6、句子中已经有who或which时，避免重复。
●Whois the manthatis making a speech?
正在演讲的那个男人是谁。
用as造句定语从句
as在定语从句中是什么意思？怎么用？as定语从句例句有哪些呢？
定语从句as造句的句子
(1) As is known to all, China is a developing country.
(2) He is from the south, as we can see from his accent.
(3) John, as you know, is a famous writer.
(4) As a student，I am supposed to work hard.
定语从句中as的用法
引导状语从句的连词as可以用作关系代词，引导定语从句，因而被称作准关系代词。
1.准关系代词as引导限制定语从句，用于以下3个结构中，as在从句中作主语、宾语或表语：
a.so / such…as
Such people as were mentioned by him were honest. (as作主语)
I’ve never seen such a clever man as he is. (as作表语)
Last term our maths teacher set so difficult an (= such a difficult) examination problem as none of us worked out.
b.the same…as
Modern statemen are often faced with the same problem as defeated the ancient Romans. (as 作宾语)
I like the same book as you do. (as 作宾语)
c.as…as
As many children as came were given some cakes. (as 作主语)
He is as diligent a man as ever lived. (as 作主语)
补充：
a.such…as 与 such…that的区别
such…as 引导定语从句；such…that引导结果状语从句。
They talked in such simple English as children could understand.
他们用孩子们能听懂的简单的英语交谈。
They talked in such simple English that children could understand it.
他们用十分简单的英语交谈，连孩子们都能听懂。
I will provide you with such things as you may need.
我要供给你一些你可以用得着的东西。
He shut the window with such a force that the glass broke.
他如此用力地关门，结果玻璃碎了。
b.the same…as与the same…that的区别：
the same…as指两物相似，the same..描述的是同一物。
This is the same bag as I lost yesterday.
这个书包和我昨天丢失的（书包）相似。（相似物）
This is the same bag that I lost yesterday.
这正是我昨天丢失的那个书包。（同一物）
2.准关系代词as引导非限制定语从句。
a.as引导非限制性定语从句，只代表主语或主句的一部分所表达的意思(不能指代某个名词或代词)，可以放在主句前，后或中间，在从句中作主语或宾语、例如：
As is known to all, he is the best student in our class. (as指代整个句子，作主语，置于句首)
He opposed the idea, as could be expected. (as 指代整个句子，作主语，置于句末)
As we all know, he studies very hard. (as 指代整个句子，作宾语，置于句首)
Tai is, as you know, an inseparable part of China. (as指代整个句子，作宾语，置于句中)
常用的这类句式有：
as is said above 综上所述 - as is known to all 众所周知
as is often the case 通常如此 - as is reported in the newspaper 如报纸所报导的
b.主句具有否定意义，as引导的定语从句位于主句之后时，as指代得主句不包括否定意义，并可用but取代。例如：
Whales are now fish, as some people think / but some people think they are.
I am no orator, as Brutus is.我不善言词,而勃鲁特斯却是个雄辩家.
Spiders are notinsects,as many people think, nor even near1y related to them.
蜘蛛不是昆虫,尽管许多人认为它是昆虫,它甚至与昆虫几乎没有关系.
但as引导的定语从句谓语主句前时，as指代的`主句仍包括否定意义。
As has been said above, grammar is not a set of dead rules.
正如前面所说的，语法不是一套死条纹。
3.在非限制性定语从句中，which和as引导定语从句时的区别：
a.which引导的从句不能放在主句前，而as引导的从句则既可以放在主句前，也可以放在主句后。
b.用能做关系代词，as和which都可以指代一个句子，但as有“正如”、“就像”之意，which则没有此含义。
He is a foreigner, as I know from his accent. (as指代一个句子，意为“正如”、“就像”)
He has to work on Sunday, which he doesn’t like. (which指代一个句子，没有“正如”、“就像”)
c.当从句的谓语动词是be或相当于联系动词的seem, become等时，可用as或which作主语。但当从句的谓语是行为动词时，只能用which作主语。
4.as 可用作连词，引导状语从句，构成省略形式“as + 过去分词”这一特殊结构，译成汉语时作用如定语。例如：
The bridge as shown in the picture is really wonderful. (as shown = as it is shown 可译为“图中的桥”)
See the answers as given at the end of this book. (as given = as it is shown 可译为“书后给出的答案”)
English as spoken is Australia is slightly different from British English.
(as spoken = as it is spoken 可译为“在澳大利亚讲得英语”)
请看下列的“as + 过去分词”结构用于修饰前面的名词：
The study as described in the article… 如文章中描述的那种学习
The program as conducted by… 由…指挥的（指导的）节目
The art as applied to medicine… 应用于医学的艺术
The products as seen on TV…电视上看到得产品
1.Football is a game which is liked by most boys.
2.This is the pen (which) he bought yesterday.
3.My house,which I bought last year,has got a lovely garden.
4.Liquid water changes to vapor,which is called evaporation.
5.The sun heats the earth,which is very important to us.
The skirt which is red belongs to me.
The cat which is running,is playing games with a little girl.
You know the rules which were made by us.
I can not move the stone which is too heavy.
I will catch the car which is coming towards us.
He told me he had done his homework, which is a lie.
He overcame all the obstacles in the past ten years, which is amazing.
My girlfriend likes dancing with other guys, which really drives me crazy.
The world which looks like a big ball
is made up of matter.
The house, which was built in 1930's, looks so different from any of the other buildings around it.
用定语从句写作文
高考英语作文定语从句的用法
Step1: Revision of the Attributive Clause
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