one,that,it,which到底怎么区分上文指代的内容

It is 后面加表示物的名词，which是关系代词，后面接定语从句修饰前面的名词。

如：It is a book which were writen by Lu xun。 这是鲁迅写的一本书。

定语从句中 which\ that 的用法与区别

修饰物体时关系代词that和 which的区分

使用that的情况：

1当先行词是nothing, something, anything, all, each等不定代词时。

eg Do you have anything that is important to tell me

2当先行词被all, any, some, no, not, every, each等修饰时。

eg I have some books that are very good

3当先行词被形容词最高级、序数词所修饰时。

eg This is the first book that I bought myself

The biggest bird that I caught is this bird

4主句是以which或who开头的特殊疑问句时

eg Which is the bike that you lost

Who is the woman that was praised at the meeting

5当先行词在从句和主句中都作表语时,无论先行词是人还是物

China is no longer the country that she was

6如有两个定语从句,其中一个已用which引导,另一个宜用that

Edison built up a factory which produced things that had never been seen before

7在there be句型中,只用that

He asked for the latest book (that) there is on the subject

8当先行词被the very, the last, the next, the only 等词修饰时。

eg This is the very book that I lost yesterday

9当先行词又有人又有物时。

eg I won’t forget the things and the persons that I saw

只能使用which的情况。

1、非限制性定语从句中。

eg Mary has a book, which is very precious

2、在介词之后。

eg This is a house in which lives an old man

3、当主句中的主语被that修饰时。

eg That dog which I found in the street belongs to Mary

One 指代的是上文已经出现过的同一或同一类东西，通常不能用来指代句子，one用作定语从句中作先行词。

比如： I don't like the red coat,but the blue one 这里的one 就是泛指上文中的coat

或者： I will throw the red shoes,the one that was broken yesterday 如果用 the one,就是特指前面提到的那一件东西。

that ，在定语从句中通常用作关系代词，即前面必须要主现一个先行词，这个先行词可以是人，也要以是物，也可以是不定代词和one，that不能用于非限制性定语从句，即，that 前面不能有逗号，that 在定语从句中不能指代一句话。

比如：We don't need anyone that has never passesd the exam

没通过考试的我们一概不需要！这里的 that 就是指代前面的 anyone

which,在定语从句中只能指代物，不能指代人（特殊情况下除外），前面不能跟 one,以及不定代词，which 可以用于非限制性定语从句，可以指代前面的一句话。

it 通常在句子中用作形式主语或形式宾语，往往后面会有真正的主语/宾语出现，一般不用于定语从句中。在一般句子中，it 也是特指前面出现的东西，这点和the one作先先词的定语从句有点像，比如 I will throw the book,the one that was broken yesterday 就可以改为；I will throw the book,because it was broken yesterday

希望我的回答能够帮助你，谢谢采纳！

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