定语从句中什么时候用that什么时候用who.which

定语从句什么时候用that，什么时候用which，什么时候用who 有什么区别~

that既可指人也可指物，which只能指物，who只能指人，一般情况下多可以用that，但在指物的介词后只能用which。

that的先行词是人或物,在定语从句中作主语、宾语或表语。
①that在定语从句中作主语时不省略，作宾语时可以省略；
②that不引导非限制性定语从句；
③that前不加介词。
who的先行词是人。who在定语从句中作主语、宾语或表语。
先行词为one、ones、anyone或 those时，或双重定语从句中一个定语从句的关系代词是that，另一个指人的关系代词词用who。

关系构成
关系从句的句法功能主要是充当定语。在英语中，关系从句通常位于它所修饰的词（组）之后。被关系从句修饰的词（组）叫做先行词（英语：antecedent），引导关系从句的词称为关系词，关系词指代先行词并在关系从句中充当一定的成分。
例如：This is the book which interests me（“which interests me”是关系从句，修饰先行词“book”，而关系词“which”指代先行词“book”并在关系子句中充当主语。这句话可以拆分为两个句子来理解：“This is the book.”和“The book interests me”）
以上内容参考：百度百科-定语从句

定语从句
定语从句（Attributive Clauses）在句中做定语，修饰一个名词或代词，有时也可以修饰部分或整个句子。
被修饰的名词,词组或代词即先行词。定语从句通常出现在先行词之后，由关系词（关系代词或关系副词）引出。
关系代词有：who, whom, whose, that, which，as 。
关系副词有：when, where, why ,how 。
关系代词和关系副词放在先行词和定语从句之间，起连接作用，同时又可做定语从句的一个成分。当关系代词做宾语时可以省略。
定语从句中的谓语动词必须在人称上和数量上和先行词保持一致。
定语从句分为限制性定语从句和非限制性定语从句。
1 、关系代词引导的定语从句
1）who, whom, that
这些词代替的先行词是人的名词或代词，在从句中所起作用如下：
Is he the man who/that wants to see you?（who/that在从句中作主语）
He is the man whom/ that I saw yesterday.（whom/that在从句中作宾语）
2) Whose 用来指人或物，(只用作定语, 若指物，它还可以同of which互换),
例如：
They rushed over to help the man whose car had broken down. Please pass me the book whose (of which) cover is green.
3)which, that
它们所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等，例如：
A prosperity which / that had never been seen before appears in the countryside.（which / that在句中作宾语）
The package (which / that) you are carrying is about to come unwrapped. (which / that在句中作宾语)
关系代词that和which 都可以指物，that 和Who 都可以指人，其用法区别：
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.
c)多用who 的情况
①关系代词在从句中做主语
A friend who helps you in time of need is a real friend .
②先行词为those , people 时
Those who were either fools or unfit for their offices could not see the cloth .
③先行词为all, anyone , ones , one 指人时
One who doesn’t work hard will never succeed in his work .
④在There be句型中
There is a stranger who wants to see you .
⑤在被分隔的定语从句中
A new teacher will come tomorrow who will teach you German .
⑥在有两个定语从句的句子中，其一用who,其二用that,但若先行词后接两个以上的并列定语从句时，后一个必须重复前一个关系代词。
The student who was praised at the meeting is the monitor that is very modest and studies very hard .
There is a teacher who is always ready to help others and who enjoys what he does .
2) 只能用that作为定语从句的关系代词的情况
a) 在不定代词，如：anything, nothing, everything, all, much, few, any, little等作先行词时，只用that，不用which。
All that is needed is a supply of oil.
Finally, the thief handed everything that he had stolen to the police.
b) 先行词有the only, the very, the just修饰时，只用that。
He is the very man that helped the girl out of the water .
c) 先行词为序数词(the last)、数词、形容词最高级时，只用that。.
The first English book that I read was “The Prince and the Pauper” by Mark Twin .
d) 先行词既有人，又有物时。
He talked about the teachers and schools that he visited .
e)当主句是以who 或which 开始的特殊疑问句时，用that 以避免重复。
Who is the person that is standing at the gate .
f)关系代词在从句中做表语
He is not the man that he used to be .
2 、关系副词引导的定语从句
关系副词可代替的先行词是时间、地点、方式或理由的名词，在从句中作状语。
1)when, where, why，how
关系副词when, where, why,how的含义相当于"介词+ which"结构，因此常常和"介词+ which"结构交替使用，例如：
There are occasions when (on which) one must yield.
Beijing is the place where (in which) I was born.
Is this the reason why (for which) he refused our offer?
I’m surprised the way how (by which) he works out the problem .
注意：
①在非限制性定语从句中，"介词+ which"结构不能代替关系副词。
如：They set up a state for their own , where they would be free to keep Negroes as slaves .
②含有介词短语的动词一般不能拆开，介词仍放在动词后面。
Is this the book which (that) she was looking for ?
3、名词/数词/代词 /形容词最高级 + 介词 + 关系代词引导定语从句
She has written a book , the name of which I have forgotten .
There are fifty-five students in our class , all of whom are working hard .
There are five continents in the world , the largest of which is Asia .
4、 as, which 引导非限定性定语从句的差别：
由as, which 引导的非限定性定语从句，as和which可代整个主句，相当于and this或and that。As一般放在句首，which在句中。
As we know, smoking is harmful to one's health.
The sun heats the earth, which is very important to us.
as可引导非限制性从句，常带有'正如'的意思。
As is know, smoking is harmful to one's health.
用法区别：
(1) as 引导的定语从句可置于句首，而which不可。
As we all know , he never smokes .
(2) as 代表前面的整个主句并在从句中作主语时，从句中的谓语必须是系动词；若为行为动词，则从句中的关系代词只能用which.。
(3)非限定性定语从句中出现expect , think , suppose 等表示猜测、想象、预料等时。
She succeeded in her doing the research work , as we expected .
(4)As 的用法 the same… as；such…as 中的as 是一种固定结构, 和……一样……。
I should like to use the same tool as is used here .
We should have such a dictionary as he is using .

who最好区分，代指人就用who。that代指前面所说的那件事。which代指东西，比如前面提到商店就用which，意思是说那个商店，因为旁边可能有很多商店

who只用于先行词人，which只用于先行词为物，that都可以用

---

船山区14726085624： 定语从句中,都有什么情况下用that? - ？
滑向司悦： 在定语从句中,关系代词who (whom) 和that都可指人和物,在一般情况下,可以互换使用,但在下列情况下值得注意: 一、用who (whom) 而不用that的情形 (1) 在非限制性定语从句中的先行词指人时,只能用who (whom). (2) 当定语从句对指人的...

船山区14726085624： 定语从句什么时候用that做关系词 - ？
滑向司悦： 先行词不管是物还是人,都可以用that 做关系词,但是有特殊情况,如下: 习惯上要用that引导的定语从句: (1)当先行词是指物的all, little, few, much, any, anything, everything, nothing, none, the one时,或先行词被all, little, few, much, any, ...

船山区14726085624： 定语从句中什么时候只能用That - ？
滑向司悦： 如果先行词,(就是引导词前面的那个名词或代词的话)是all much anything something 这些不定代词、以及形容词的最高级、或先行词为一人一物的时候,就只用that不用wihcn的.有关引导词选择呢,你要记住一些,这样考试起来会好用一些...

船山区14726085624： 定语从句什么时候只能用that - ？
滑向司悦： (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 ...

船山区14726085624： 什么时候的定语从句只能用that - ？
滑向司悦： 定语从句只能用that (1) 如果先行词是all, much, anything, something, nothing, everything, little, none等不定代词,关系代词一般只用that,不用which.例如: All the people that are present burst into tears.Is there anything that I can do ...

船山区14726085624： 在定语从语中,什么时候用THAT,什么时候用WHICH? - ？
滑向司悦： 只能用that的情况: <1>关系代词在定语从句中作表语,不管是人或物只能用that. He is not the man that he was when I first saw him. 【他现在不是我第一次见他时那样的.】<2>当先行词即指物又指人时,多用that引导定语从句. Look at the ...

船山区14726085624： 定语从句中 什么时候必须用that - ？
滑向司悦：[答案] 省略宾语的情况是:后面所跟的从句缺宾语,其他情况that 都不省略

船山区14726085624： 定语从句that的用法!什么时候能用that什么时候不能用that什么时候只能用which什么时候只能用of+介词不能用指示副词 - ？
滑向司悦：[答案] 一般来说关系代词which和that可以互换,但这几种情况下不能用that,只能用which:在非限制性定语从句里、关系代词前面出现介词提前.这几种情况下只能用that不能用which:先行词前面出现最高级,序数词和there be修饰、先行词既有人又有物. ...

船山区14726085624： 定语从句中,什么时候用that ,什么时候用which? - ？
滑向司悦：[答案] 定语从句(Attributive Clauses)在句中做定语,修饰一个名词或代词,有时也可以修饰部分或整个句子. 被修饰的名词,词组或代词即先行词.定语从句通常出现在先行词之后,由关系词(关系代词或关系副词)引出. 关系代词有:who, whom, whose, ...

船山区14726085624： 定语从句中的连接词什么时候一定要用that? - ？
滑向司悦： 指人, 物,做主语,宾语, 表语时可以用 在指物的先行词被序数词,最高级, any all 等词修饰,或是先行词是anything, nothing much, all 等不定代词时一定要用 如不明白请追问,如果满意请【采纳】 祝学习进步