?指人的关系代词：who, whom, whose, that 的用法：
(1) 作主语(who, that )
Those who are going to play in the match are to meet at the gate at 1:30 after lunch.
在本句中，先行词是those;关系代词who引导定语从句，同时代替先行词在从句中担任动词are going to play 的主语。
The man who/that is talking with Mr. Wang is a famous doctor.
在本句中，先行词是the man;关系代词who/that引导定语从句，同时代替先行词在从句中担任动词is talking的主语。
这个复合句可以还原成两个句子：The man is a famous doctor. He is talking with Mr. Wang.
(2) 作宾语包括作介词宾语(whom, that )。此种情况下的关系代词可以省略;
This is just the man (whom/that) I want for the job.这正是我要的做这份工作的人。
在本句中，先行词是the man；关系代词whom/that引导定语从句，同时代替先行词在从句中担任动词want 的宾语。
Is he the manager (whom/that) you are looking for?
如：The book from which I got a lot of useful information was written by a famous scientist.
Who is the boy with whom you were talking a moment ago.
I know the young couple from whose house the music is coming.
This is the instruction manual which/that tells you how to operate the computer.
The chair (which /that) you broke yesterday is now being repaired.
The film (which/that) I saw last night was about a soldier who fought in WWII.
This is the bike for which I paid $ 100.
The car (which/that) he went in was a black Cadillac.
The accounts of the company, (which/that) I’ve been paying great attention to, are in balance.
3.whose 和of which 指代人或事物，作定语。of which 可用whose 代替;
The car whose lights (of which the lights/the lights of which) were all broken was my father’s.
例：His house of which the windows (the windows of which /whose windows) were all broken was a depressing sight.
That is the book whose cover (of which the cover/the cover of which ) was broken.
如：Peter is the one who everybody believes will fail to bring off the contract. Peter 是那个人人都认为不能完成合同的人。(everybody believes 是插入语)
At the election I voted for the man whom I believed to be the most suitable.
例：These are the operating instructions that/which are written in English 。
Are you staying at the white house which/that is newly completed and which /that has 15 bedrooms, 3 kitchens and 4 toilets?
So far as I know, there are many VIPs who are going to attend the reception.
例：Her brothers, both of whom work in America, ring her up every week。
The buses, most of which were already full, were surrounded by an angry crowd，
That tower block, which cost five million dollars to build, has been empty for five years.
Cricket, which I know very little about, is a very popular sport in England。
The accounts of the company ,which I’ve been paying great attention to, are in balance.
例：I shall never forget the day when (=on which) we first met.
The rain came at a time when (=at which) it was not needed.
This is the computer where (=by/on which) he has stolen top-secret documents.
Here is the place where (=at which) the murder took place.
He didn’t give any reason why (=for which) I had been fired.
This is the house in which (=where) my parents used to live.
如：In all the years that (=when/during which) I was at collage
the reason that(=why/for which)he is not happy
The direction(that)(=in which )the heavenly bodies move can’t be changed.
He is unpopular because people don’t like the offensive way (that)(=in which) he talks.
如：This is the room where/in which we’ll celebrate the New Year.
This is the room(that /which)we’ll celebrate the New Year in.
This is the room which /that will be used for the celebration of the New Year.
This is the room (which/that) we’ll use for the New Year dinner party.
The reason (that /which) he had given was not sound enough.
The reason why/for which he had done that was not sound enough.
This is the house where she lives.这是她住的房子。
【比较：This is the house (that/which) she has bought. 这是她买的房子。This is the house that/which I’ve told you is extremely expensive.这就是我和你说过极其昂贵的那幢房子。】
I met him in the year when I was first in Xi’an.
That is the reason why he did not come that morning.
例：Anyone who/that touches the wire will get an electric shock.
I would give her anything that she asked for.
The first person who/that opens the door will get a shock.
There will be a special price for anybody who orders a suit in the next two weeks.
如：Those who will go abroad for training next year will start learning English tomorrow.
例：Edison was one of the greatest inventors that ever lived.
This is the best film that I’ve ever seen.
She was the greatest woman that/who has ever lived.
②先行词有the same, the very, the first, the last, all, no, the only, much, little, none, any, every等时，常用that, 而不用which：
例：He was the first man that we saw in the village.
There is little that is interesting.
I still remember the first time that we met.
I’ll do anything (that) I can to help you.
Everything that can be done has been done.
God bless this ship and all who sail in her.
All that I can say is thank you very much.
如：We were deeply impressed by the workers and their working conditions that we had visited.
We listened to him talk about the men and books that interested him。
如：Let’s discuss only such questions as concern us.
I’ve never heard such stories as he tells.
I shall be surprised if he does this in the same way as I do.
She works in the same office as I do.
She wears the same kind of clothes as her sister does.
He’s wearing the same dress as he wore at Mary’s wedding.
This is the same watch as I have lost.
I’ve never seen such kind of people as they are.
I’ve never seen such kind people as they are.
I want the same shirt as my friend’s.
Such machines as are used in our workshop are made in china.
as 引导非限定性定语从句即可放在主句之前，也可放在主句之后，用来修饰整个句子。当as在从句中作主语时，后面常接下列句型。如：as is known, as is said, as is reported as is announced 等。
例如：As we all know, Mr. Wang is a good teacher.
As is known to all, the earth revolves round the sun.
He is tired, as you can see.
As I expected, he didn’t believe me.
如：He made a long speech, as was expected.
He made a long speech, which was unexpected.
Tom drinks a lot every day, which his wife doesn’t like at all.
注：⑤在“介词+关系代词”的结构中，也可用复杂介词，如：by means of (用，依靠)，as a result of (作为结果)等：
例：I have three children, one daughter and two sons, all of whom graduated from the same university .
The police, in whom I have great confidence, are trying to find out who did it.
This is the part of the river in which I like to swim.
The man from whom you bought the house is my uncle.
This is the desk by means of which he jumped over the wall.
She was running a fever, as a result of which she failed in the exam.
He is the man from whose house the picture was stolen.
例：Here are some words which are often used but which are very confusing.
He is the only person that I can find who is able to solve the problem.
The book (that /which) I got a lot of information from was written by a famous scientist.
Who is the boy (that/whom) you were talking with a moment ago?