定

语

从

（人）在从句中做主语或宾语

物

在从句中做主语或宾语

who

which

This is the doctor who saved the boy’s life .

这就是救了孩子生命的医生。

She is the new student whom I want to introduce to you .

她就是我要介绍给你的新学生

Please pass me the book which is lying on the table.

请递给我摆在桌上的那本书。

The novel which Tom bought is very interesting.

汤姆买的小说很有意思。

Can you lend me the magazine about which you talked yesterday?

who在从句中做主语

whom在从句中做宾语，口语中who可以代替whom，也可以被省去，但做介词宾语时只能用whom

which在从句中做主语。

which充当宾语时可以省去。

which做介词宾语不可省

定

语

从

人

或

物

The professor whose daughter teaches you English is Dr. Williams

那位教授是威廉斯他的女儿教你英语。

The professor, the daughter of whom teaches you English is Dr. Williams.

The bike whose brake was damaged has now been repaired.

那辆坏了闸的自行车现在已经修好了。

whose在从句中做定语

指某人的也可以用…of whom代替whose

指物时也可以用…of which 代替 whose

人

The woman that is playing the piano is Miss Zhang.

正在弹钢琴的那位妇女是张小姐。

I’d like to see the films that are just on show.

that指人做主语

物

all, little much和some,any every ,no 构成的合成代词

人

或

that

that

They talked for about an hour of things and  persons that they remember in the school.

他们谈起他们所记得起的学校里的人和事，谈了大约有半个小时。

I’ll tell you all(that )I know about it .

我要告诉你我所知道这件事的一切情况。

Is there anything (that) I can do for you?

有什么我可以帮助做的事吗？

I’ve brought everything (that )you need.

我把你需要的东西都拿来了。

This is the best film that I have seen .

这是我看过的最好的一部电影。

The first place that we’ll visit is Beijing Library.

先行词分别表示人和物，关系代词要用that，不用who或which

先行词表示物，关系代词用that不用which, 在从句中做宾语可省去 。如果先行词是人时，关系代词不受制约，用that或who (whom)

均可

定

语

从

人

或

He is the only person that is believable.

他是唯一可靠的人。

John is the very person that she wants to see.

约翰正是她要见的人。

Who is the man that is talking with Tom ?

正在和汤姆谈话的人是谁？

Which of the books that you bought is easy to read?

先行词被the only, the very,the same 等修饰时用关系代词that.

时

He came at a time when we. needed him most.他在我们最需要的时候来了。

We’ll never forget the day when the People’s Republic of China was founded.

This is the room where he put up for the night.

原因

I know the reason why she studies so well .

非

限

制

性

定

语

从

人

物

没有固定的先行词而是一个句子

who

whom

which

which

George ,who is my classmate, has won a scholarship.

乔治获得了奖学金，他是我的同学。

Dr. Li , whom I know very well, will come here tomorrow.

李大夫明天将来这儿，我跟他很熟悉。

I gave him a New Year card ,which he enjoyed very much.

我给他一张贺年卡，他很喜欢它。

He studies hard at school when he was young, which leads to his success in his later life .

他年轻时在校学习努力，这导致了他后来生活中的成功。

He gets up early ，as is always his habit.

他总是早起床，这是他的习惯。

John was admitted into the college, as we had expected.

约翰被大学录取了，这是我们期待的。

The earth ,as is known to all ,is round.

人人皆知，地球是圆的。

who, whom不能省去，也不能用that代替

which指物，不可省去，也不能用that代替

which作主语指它前面的整个句子，不可用that代替，强调结果。

as指全句，在从句中做主语。

as指全句意思，在从句中做宾语。

as引导的定语从句可以放在句首，句中或句末。

This is the same book as I lost yesterday.