关系代词that 的用法
定语从句that
定语从句是一种用来修饰名词或代词的从句，通常由关系代词或关系副词引导。
在定语从句中，that是一个常用的关系代词，用来引导一个限定性定语从句。
下面是一些关于定语从句中that的用法和例句。
1.用于引导限定性定语从句，修饰先行词。
例句：The book that I borrowed from the library is very interesting.我从图书馆借来的那本书非常有趣。
2.用于引导表示数量、程度、时间等的定语从句。
例句：He didn't have enough money that he could afford a new car.他没有足够的钱可以买得起一辆新车。
3.在口语和非正式语境中，有时可以省略that。
例句：The movie she recommended me was really good.她推荐给我的那部电影真的很好。
4.当先行词为something、anything、nothing、everything等不定代词时，that可以用于引导定语从句。
例句：Is there anything that I can help you with?有什么我可以帮忙的吗？5.在某些情况下，that可以用来代替who或whom，特别是在口语和非正式语境中。
例句：The man that I met at the party is a doctor.我在派对上认识的那个男人是个医生。
6.当先行词是all、everything、anything等表示整体或全部的词时，定语从句中的that可以用来表示“所有的”或“任何的”等含义。
例句：All the books that are on the shelf belong to me.书架上所有的书都是我的。
7.当先行词为序数词或最高级形容词时，定语从句中的that可以用来表示“…的”。
例句：This is the highest mountain that I have ever climbed.这是我爬过的最高的山。
THAT用法情况总结
THAT用法总结第一、that 用作形容词（后接复数名词时用those）它用来指已被提到的人或物；也可表对比，指两个中较远的那个。
What about that book you borrowed from me last month？请注意，that 有时候在句子中具有喜欢或轻蔑等感情色彩。
that little son of his 他那个小宝贝儿子That George！乔治那家伙！（含有轻蔑语气）第二、that 用作代词。
1. that 用作指示代词（复数形式是those），其指代意义同形容词用法，同时它还可以用作定语从句中的先行词；还可为了避免重复，代替前述名词。
.that用来替代前面提到的特指的事物,所代替的名词可以是可数名词,也可以是不可数名词.代替可数名词可以用the one替换.但其前面不可用任何限定词修饰.例如:1)The population of China is larger than that of Japan.(that代替不可数名词population,不可用the one替换)2)The headteacher in your class is younger and more active than that in theirs.(that代替可数名词headteacher,可用the one替换)that 代替指物的单数可数名词或抽象不可数名词，一般是特指的those 代替指人或指物的复数名词，一般是特指的=the onesone 代替指人或指物的单数可数名词，一般是泛指的ones 代替指人或指物的复数名词，一般是泛指的That is what he told me.What is that (which) you have got in your hand?The price of rice is higher than that of flour.2. that 用作关系代词，引导限制性定语从句。
that的用法总结大全
that的用法总结大全想了解that的用法么?今天给大家带来了that的用法，希望能够帮助到大家，下面就和大家分享，来欣赏一下吧。
that的用法总结大全that的意思det. 那个，那pron. 那个，那conj. 多么,如此…以至,用于某些动词、形容词和名词后，引出各种从句adv. 不那么,那样that用法that可以用作代词that用作指示代词的意思是“那,那个”。
可指前面提到的那件事,也可指在空间或时间上较另一事物远的事物或人,还可指要表明的或要提及的事物、想法等。
that用作关系代词时,指人或事物,同时又在从句中充当句子成分。
that偶尔也可引导非限制性定语从句。
that还常用以代替who, whom, which,但that...which中的that用做关系代词的先行词。
that用作代词的用法例句What is the difference between this and that?这个和那个之间的区别是什么?I walked to the gate that opened towards the lake.我走向那扇临湖的大门。
The output of steel this year has increased by 20% compared with that in 1992.今年钢产量比一九九二年增长了百分之二十。
that可以用作连词that用作连词时可引导主语从句、宾语从句、表语从句、同位语从句和状语从句。
that还常引导间接引语或形容词后面的从句。
that在以it作形式主语的句子中或引导宾语从句、状语从句时常可省略。
that用作连词的用法例句I am well aware that this is a tough job.我深知这是一件棘手的工作。
He claimed that the newspaper report was a libel.他声称报纸上的报导是一种诽谤。
关系代词that_的用法
关系代词that 的用法一、当先行词是anything, everything, nothing (something 除外), few, all, none, little, some等代词时，或者是由every, any, all, some, no, little, few, much，each等修饰时e.g. (1) Have you taken down everything (that) Mr. Li has said?(2) There seems to be nothing (that) seems impossible for him in the world.(3) All that can be done has been done.(4) There is little (that) I can do for you.(注意1：部分时候that可以省略，如部分例句将that用括号括住。
注意2：当先行词指人时，偶尔也可以用who)二、当先行词被序数词修饰e.g. The first place that they visited in London was the Big Ben.三、当先行词被形容词最高级修饰时e.g. This is the best film that I have seen.四、当形容词被, the only，the same, the last 修饰时e.g. (1) After the fire in his house, the old car is the only thing that he owned. （当先行词指人时，偶尔也可以用who ）(3) Wang Hua is the only person in our school who will attend the meeting.五、当先行词前面有who, which等疑问代词时e.g. (1) Who is the man that is standing there?(2) Which is the T-shirt that fits me most?关系代词who 人主语Do you know the man who is talking with your mother? whom, which和that在从句中做宾语时，常可以省略，但介词提前时后面关系代词不能省略，也不可以用thatwhom 人宾语Mr. Smith is the person with whom I am workingThe boy (whom) she loved died in the war..whose 人，物定语I like those books whose topics are about history.The boy whose father works abroad is my deskmate.that 人，物主语，宾语A plane is a machine that can fly.She is the pop star (that) I want to see very much.which 物主语，宾语The book (which) I gave you was worth $10.The picture which was about the accident was terrible.as 人，物主语，宾语He is such a person as is respected by all of us.This is the same pen as I lost yesterday. as做宾语一般不省略关系副词when 时间时间状语I will never forget the day when we met there. 可用on whichwhere 地点地点状语This is the house where I was born. 可用in which why 原因原因状语I can’t imag ine the reason why he turned down my offer. 可用for whichII. that与which, who, whom的用法区别：情况用法说明例句只用that的情况1．先行词为all, everything, anything, nothing, little, much,等不定代词时。
that在从句中的用法
that在从句中的用法在英语中，"that"是一个常用的代词，可以在从句中作为主语、宾语、表语或同位语使用，表示特定的事物或概念。
以下是一些常见的"that"在从句中的用法：1. 主语从句：在主语从句中，"that"常被省略，但如果引导的主语太长或与主句的主语不同，通常会保留"that"。
例如：“That (that) he is a good teacher is clear.”2. 宾语从句：在宾语从句中，"that"可以省略，尤其是在某些动词（如"think"，"believe"等）后。
例如：“I believe (that) she will succeed.”3. 表语从句：在表语从句中，"that"通常不省略。
例如：“The reason why he was late was that he missed the bus.”4. 同位语从句：在同位语从句中，"that"不作任何成分，因此通常省略。
例如：“The news that he won the prize was exciting.”5. 关系代词：在定语从句中，"that"作为关系代词，可以指人或物，代替先行词在从句中充当成分。
例如：“The book that I read was very interesting.”6. 强调结构：在强调结构中，"that"用于强调某个特定的部分。
例如：“It was she that (that) found the lost child.”需要注意的是，"that"在从句中的用法可能会因为语境、习惯或避免重复而有所不同。
因此，在实际使用中，需要根据上下文和语法规则来判断是否省略"that"。
定语从句that 的用法
定语从句that 的用法一、什么是定语从句定语从句是指在一个句子中用来修饰名词或代词的从句。
而连接这个从句和主句的词就是关系副词that。
定语从句起到限制或说明名词或代词的作用，对于增强语境的描述和信息的详细化有重要作用。
二、that 的用法1. 作为关系代词使用在定语从句中，that 可以指代人和物，并可用来替代所有格形式。
例：This is the book that I borrowed from the library.2. 作为引导词在某些情况下，that 不仅可以作为关系代词使用，还可以作为引导词引导定语从句。
例：It is important that we take care of the environment.三、that 引导定语从句的具体用法1. 修饰人的关系从句当定语从句修饰人时，即修饰先行词为人时，通常使用关系代词who 或者that。
例1：He is the man who/that helped me yesterday.例2：The woman that I met this morning was very kind.需要注意的是，在口头交流中，很多时候我们会省略掉关系代词who 或者that。
如：- He is the man I met yesterday.- The woman I talked to was very kind.2. 修饰物的关系从句当定语从句修饰物时，即修饰先行词为物时，我们通常使用关系代词that。
例1：The car that I bought is very expensive.例2：I don't like the dress that she is wearing.需要注意的是，在修饰物时，我们一般不用关系代词 which。
因此，以下两个句子中的第二个从句都是错误的。
- The book, which I read last night, was very interesting.- The watch, which he gave me as a gift, is beautiful.正确的表达应该是：- The book that I read last night was very interesting.- The watch that he gave me as a gift is beautiful.3. 修饰整个主语或宾语从句在有些情况下，定语从句可以用来修饰整个主语或宾语从句。
that的五种用法
that的五种用法一、作为代词1. 指示代词：that可以用来指示一个具体的人或物，表示“那个”、“那些”。
例如：That book is mine.（那本书是我的。
）2. 关系代词：that可以用来引导定语从句，表示“……的”。
例如：The book that I bought yesterday is very interesting.（我昨天买的那本书非常有趣。
）3. 引导主语从句：that可以用来引导主语从句，表示“……是”。
例如：That he is a liar is well known to everyone.（他是个骗子这件事是众所周知的。
）4. 引导宾语从句：that可以用来引导宾语从句，表示“……是”。
例如：I know that he is a liar.（我知道他是个骗子。
）二、作为形容词1. 表示特定的人或物例如：I want to buy that car over there.（我想买那辆车。
）2. 表示强调例如：He's the man that I love most in the world.（他是我在世界上最爱的男人。
）三、作为副词1. 表示距离或方向例如：She pointed to the house over there and said, "That's where I live."（她指着那边的房子说：“那就是我住的地方。
”）2. 表示程度或数量例如：He's that good at playing chess that he can beat anyone.（他下棋下得那么好，可以打败任何人。
）四、作为连词1. 引导结果状语从句例如：He was so tired that he fell asleep on the sofa.（他太累了，以至于在沙发上睡着了。
）2. 引导目的状语从句例如：I'm saving money so that I can buy a new car.（我正在存钱，以便买一辆新车。
that引导的定语从句的用法总结
that引导的定语从句的用法总结关系代词that可以引导限定性定语从句，修饰代表人或事物的先行词，不能用于引导非限定性定语从句。
that可以充当从句的主语、宾语、表语。
扩展资料that的用法：注意：that常用作关系代词，可指代某人，也可指代某物，指物时有的时候可用which替换that，指人时可用who替换。
但在下列情况下，一般用that。
that指代某物事时：1、先行词为all, few, little, much, the one, something, anything, everything, nothing等时。
（1）We'll do all that we can to protect the endangered plants and animals.我们将尽我们的最大努力来保护那些濒危的动植物。
（2）There is much that I wan to tell you.我有很多想要告诉你的话。
（3）Is there anything that I can do for you?有什么我可以帮你的吗？2、先行词被all, every, no, some, any, (a)few, (a)little, much等限定词修饰时。
（1）You can borrow any book that you want to read in our school library.在我们图书馆，你可以借任何你想读的书。
3、先行词被序数词或形容词最高级修饰时。
（1）This is the most beautiful city that I've ever seen.这是我见过的最漂亮的城市。
4、先行词被the only, the very, the right, the last 等修饰时。
（1）This is the very factory that they visited last summerholiday.这恰好是他们去年参观的那个工厂。
THAT用法总结
THAT用法总结第一、that 用作形容词(后接复数名词时用those)它用来指已被提到的人或物；也可表对比，指两个中较远的那个。
What about that book you borrowed from me last month？请注意，that 有时候在句子中具有喜欢或轻蔑等感情色彩。
that little son of his 他那个小宝贝儿子That George！乔治那家伙！（含有轻蔑语气）第二、that 用作代词。
1. that 用作指示代词(复数形式是those），其指代意义同形容词用法，同时它还可以用作定语从句中的先行词；还可为了避免重复,代替前述名词。
.that用来替代前面提到的特指的事物，所代替的名词可以是可数名词，也可以是不可数名词。
代替可数名词可以用the one替换.但其前面不可用任何限定词修饰。
例如:1)The population of China is larger than that of Japan.（that代替不可数名词population,不可用the one替换）2)The headteacher in your class is younger and more active than that in theirs。
（that 代替可数名词headteacher,可用the one替换）that 代替指物的单数可数名词或抽象不可数名词，一般是特指的those 代替指人或指物的复数名词,一般是特指的=the onesone 代替指人或指物的单数可数名词，一般是泛指的ones 代替指人或指物的复数名词，一般是泛指的That is what he told me。
What is that （which) you have got in your hand？The price of rice is higher than that of flour.2。
关系代词that用法
关系代词that用法：that只用于限制性定语从句中只能用that，不能用which的情况：1、先行词是形容词最高级或者它的前面有形容词最高级修饰时Eg: This is the best way that has been used against air pollution in cities.English is the most difficult subject that you will learn during these years.2、先行词是序数词，或它前面有一个序数词修饰时Eg: He is the last person (that) I want to see.It is the first American movie of this kind that I’ve ever seen.3、主句中已有疑问词who或which时Eg: Which is the bike that you lost?Who is the woman that was praised at the meeting?4、先行词既有人又有物时Eg: Do you know the things and persons that they are talking about?5、先行词是all, much, little, something, everything, anything, nothing, none,the one等代词时Eg: You should hand in all that you have.We haven’t got much that we can offer you.I mean the one that you talked about just now.6、先行词前面有only, any, few, little, no, all, one of, the same, the very等词修饰时Eg: The only thing that we can do is to give you some money.Li Ming is the only one that wants to be a teacher.Li Ming is one of the students that want to be teachers in our class.7、有两个定语从句，其中一个关系代词已用which, 另外一个宜用thatEg: Edison built up a factory which produced things that had never been seen before.。
关系代词that的用法
关系代词that的用法that常用作关系代词，可指代某人，也可指代某物，指物时有的时候可用which替换that，指人时可用who替换。
但在下列情况下，一般用that。
一、that指代某物事时1.先行词为all, few, little, much, the one, something, anything, everything, nothing等时。
如：（1）We'll do all that we can to protect the endangered plants and animals.我们将尽我们的最大努力来保护那些濒危的动植物。
(2) There is much that I wan to tell you.我有很多想要告诉你的话。
(3) Is there anything that I can do for you?有什么我可以帮你的吗？2. 先行词被all, every, no, some, any, (a)few, (a)little, much等限定词修饰时。
如：(4) You can borrow any book that you want to read in our school library.在我们图书馆，你可以借任何你想读的书。
3. 先行词被序数词或形容词最高级修饰时。
如：（5）This is the most beautiful city that I've ever seen.这是我见过的最漂亮的城市。
4. 先行词被the only, the very, the right, the last 等修饰时。
如：（6）This is the very factory that they visited last summer holiday.这恰好是他们去年参观的那个工厂。
（7）This is the only painting in this style that we have.这种风格的画我们仅有一幅。
that的用法总结大全
that的用法总结大全想了解that的用法么?今天编辑给大家带来了that的用法，希望能够帮助到大家，下面编辑就和大家分享，来欣赏一下吧。
that的用法总结大全that的意思det. 那个，那pron. 那个，那conj. 多么,如此…以至,用于某些动词、形容词和名词后，引出各种从句adv. 不那么,那样that用法that可以用作代词that用作指示代词的意思是“那,那个”。
可指前面提到的那件事,也可指在空间或时间上较另一事物远的事物或人,还可指要表明的或要提及的事物、想法等。
that用作关系代词时,指人或事物,同时又在从句中充当句子成分。
that偶尔也可引导非限制性定语从句。
that还常用以代替who, whom, which,但that...which中的that用做关系代词的先行词。
that用作代词的用法例句pared with that in1992.今年钢产量比一九九二年增长了百分之二十。
that可以用作连词that用作连词时可引导主语从句、宾语从句、表语从句、同位语从句和状语从句。
that还常引导间接引语或形容词后面的从句。
that在以it作形式主语的句子中或引导宾语从句、状语从句时常可省略。
that用作连词的用法例句I am well aware that this is a tough job.我深知这是一件棘手的工作。
He claimed that the newspaper report was a libel.他声称报纸上的报导是一种诽谤。
That she is still alive is really a relief to usall.她还活着,这真是令我们所有人都感到宽慰的一件事。
that用法例句1、A miracle is something that seems impossible but happens anyway.奇迹就是看似不可能，却发生了。
2、If you wait, all that happens is that you get older.如果你等待，发生的只有变老。
that的用法
that的用法that是英语中一个非常常见的单词，在很多语境下都经常被使用。
而且that的使用方式也非常灵活，它可以作为代词、连接词、形容词和副词等多种词类的词语。
在本文中，我们将讨论that的不同用法以及它们的具体解释。
1. 作为关系代词当that作为关系代词时，它用于连接从句和主句。
在这种情况下，that可以引导先行词所表示的事物、人物或概念的定义、描述或限定。
以下是该用法的一些例子：例句1：The book that John borrowed from the library is due today.这句话中，that引导了后面的从句，用来限定书籍的种类，并指出该书籍是由John从图书馆借来的。
例句2：I met a girl yesterday who said that she knows you.这句话中，who代替了一个女孩，而that则引导了一个从句，用来描述这个女孩说了什么话。
2. 作为连词作为连词，that可以连接两个句子或两个短语，并使它们的含义更为紧密。
以下是该用法的一些例子：例句1：I believe that you can achieve anything if you put your mind to it.这句话中，that连接了两个句子，表达了作者的信念。
例句2：I think that we should leave early in the morning to avoid traffic.这句话中，that连接了两个短语，表达了作者的建议。
3. 作为形容词当that作为形容词时，它用于描述一个特定的事物或人物，并限制其范围。
以下是该用法的一些例子：例句1：I prefer that brand of coffee over any other.这句话中，that位于品牌之前，用来描述一种特定的咖啡品牌。
例句2：She likes that dress, but I don't think it looks good on her.这句话中，that用来描述一件特定的裙子，并限制了它适合的人群。
that 用法大全
6个关系代词的用法(一)
6个关系代词的用法(一)6个关系代词的用法在英语中，关系代词（relative pronouns）扮演着连接主句与从句的重要角色。
下面将详细介绍英语中的6个关系代词的用法。
1. that•作主语时，引导限制性从句。
例如：–The book that is on the table is mine.（在桌子上的那本书是我的。
）•作宾语时，引导宾语从句。
例如：–She told me that she would come.（她告诉我她会来。
）2. which•作主语时，引导非限制性从句。
例如：–The weather, which was warm, made us happy.（天气很暖和，让我们很开心。
）•作宾语时，引导非限制性从句。
例如：–He lost his wallet, which made him upset.（他丢了钱包，这让他很沮丧。
）3. who•作主语时，引导限制性从句。
例如：–The person who called me yesterday was my friend.（昨天给我打电话的人是我的朋友。
）•作宾语时，引导限制性从句。
例如：–The man who I saw at the park is a famous actor.（我在公园看到的那个人是位著名演员。
）4. whom•作宾语时，引导限制性从句。
例如：–The woman whom I spoke to is my neighbor.（我跟她说话的那个女人是我的邻居。
）5. whose•用来指示所属关系，引导限制性从句。
例如：–The girl whose bag is lost is crying.（包丢了的那个女孩在哭。
）6. where•引导地点状语从句。
例如：–I visited the school where my mother used to teach.（我去了我妈妈曾经教过的那所学校。
关系代词that的用法
关系代词that的用法一、关系代词that的基本定义与用法关系代词是连接主句和从句之间关系的词语，其中一个常见的关系代词就是“that”。
在英语中，我们使用关系代词“that”来引导定语从句或者宾语从句。
本文将详细介绍关于“that”的不同用法及其在不同句子结构中的应用。
二、作为定语从句引导词的用法1. 用于具体事物或人的定语从句：例如，“The book that I borrowed from the library is very interesting.” （我从图书馆借的那本书非常有趣。
）2. 用于指示超过两个事物或人时：例如，“The house that is on the left belongs to my friend.”（左边那栋房子属于我的朋友。
）3. 在非限定性定语从句中不能使用“that”，只能使用“which”：例如，“My car, which is parked over there, needs to be repaired.”（停在那里的我的汽车需要修理。
）三、作为宾语从句引导词的用法1. 在某些动词后面可以直接跟宾语从句，而无需使用连词。
“That”通常被省略，但在强调时不能省略：“I believe (that) he will succeed.” （我相信他会成功。
）2. 在宾语从句中作为从属连接词，引导主语是人时可以省略：例如，“It is surprising (that) she didn't know about the party.”（令人惊讶的是，她不知道派对。
）四、与其他关系代词的比较1. 与“who”和“which”的区别：- “Who”只能指人，而“which”只能指事物或动物；而使用“that”既可以指人也可以指事物或动物。
- “Which”在非限定性定语从句中更常见，而“who”和“that”则更常用于限定性定语从句。
2. 与“where”，“when”，以及“why”的区别：- 当定语从句修饰地点时，我们使用关系副词“where”。
that 引导的表语从句
that 引导的表语从句在英语中，表语从句通常由关系代词 that 引导，它可以用来引导主语从句、宾语从句和表语从句。
与其他关系代词相比，that 在使用上较为灵活，它可以省略，也可以不省略，但需要注意的是，在某些情况下，that 的省略会导致句意不清晰，因此，我们需要根据具体情况来决定是否省略。
那么，如何正确使用 that 引导表语从句呢？首先，我们需要知道表语从句的特点，它通常位于系动词之后，用于描述主语的身份、状态、性质等。
例如：My brother is a doctor. → My brother is someone who helps people.在这个例子中，表语从句由 that 引导，用来描述主语 brother 的身份，即他是一个帮助别人的人。
接下来，让我们来看一些常见的用法。
1. that 用于强调有时候，that 可以用来强调表语从句的内容，这种用法通常出现在口语中。
例如：I'm telling you, that is a great idea!在这个例子中，that 被用来强调表语从句，表示“那确实是一个很好的主意”。
2. that 的省略在表语从句中，that 可以省略，但需要注意的是，当表语从句中的主语和主句的主语不一致时，我们不能省略 that。
例如：The fact is that he is not coming. → The fact is he is not coming.在这个例子中，that 被省略了，句子仍然通顺，因为表语从句的主语和主句的主语一致。
But: The fact is I am not going. (不可省略 that) 在这个例子中，表语从句的主语和主句的主语不一致，因此不能省略 that。
3. that 的替代词除了 that，还有一些其他的关系代词可以用来引导表语从句，例如 who、whom、whose、which 等。
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关系代词that 的用法
一、当先行词是anything, everything, nothing (something 除外), few, all, none, little, some等代词时，或者是由every, any, all, some, no, little, few, much，each等修饰时
e.g. (1) Have you taken down everything (that) Mr. Li has said?
(2) There seems to be nothing (that) seems impossible for him in the world.
(3) All that can be done has been done.
(4) There is little (that) I can do for you.
(注意1：部分时候that可以省略，如部分例句将that用括号括住。
注意2：当先行词指人时，偶尔也可以用who)
二、当先行词被序数词修饰
e.g. The first place that they visited in London was the Big Ben.
三、当先行词被形容词最高级修饰时
e.g. This is the best film that I have seen.
四、当形容词被, the only，the same, the last 修饰时
e.g. (1) After the fire in his house, the old car is the only thing that he owned. （当先行词指人时，偶尔也可以用who ）
(3) Wang Hua is the only person in our school who will attend the meeting.
五、当先行词前面有who, which等疑问代词时
e.g. (1) Who is the man that is standing there?
(2) Which is the T-shirt that fits me most?
关系代词who 人主语Do you know the man who is talking with your mother? whom, which和that在从句中做宾语时，常可以省略，但介词提前时后面关系
代词不能省略，也不可以用that
whom 人宾语Mr. Smith is the person with whom I am working
The boy (whom) she loved died in the war..
whose 人，物定语I like those books whose topics are about history.
The boy whose father works abroad is my deskmate.
that 人，物主语，宾语A plane is a machine that can fly.
She is the pop star (that) I want to see very much.
which 物主语，宾语The book (which) I gave you was worth $10.
The picture which was about the accident was terrible.
as 人，物主语，宾语He is such a person as is respected by all of us.
This is the same pen as I lost yesterday. as做宾语一般不省略
关系副词when 时间时间状语I will never forget the day when we met there. 可用on which
where 地点地点状语This is the house where I was born. 可用in which why 原因原因状语I can’t imag ine the reason why he turned down my offer. 可用for which
II. that与which, who, whom的用法区别：
情况用法说明例句
只用that的情况1．先行词为all, everything, anything, nothing, little, much,等不定代词时。
2．先行词被all, any, every, each, much, little, no, some, few等修饰时
3．先行词有形容词最高级和序数词修饰时
4．先行词既指人又指物时
5．先行词被the only, the very修饰时
6．句中已经有who或which时，为了避免重复时1.He told me everything that he knows.
2.All the books that you offered has been given out.
3.This is the best film that I have ever read.
4.We talked about the persons and things that we remembered.
5.He is the only man that I want to see.
6.Who is the man that is making a speech?
只用which, who, whom的情况1．在非限制性定语从句中，只能用which指代物，用who/whom指人
2．在由“介词+关系代词”引导的定语从句中，只能用which指物，whom指人。
3．先行词本身是that时，关系词用which, 先行词为those, one, he时多用who。
He has a son, who has gone abroad for further study.
I like the person to whom the teacher is talking.
Those who respect others are usually respected by others.
III. as与which的区别：
定语从句区别例句
限制性定语从句中名词前有such和the same修饰时，关系代词用as,不能用which He is not such a fool as he looks.
Don’t read such books as you can’t understand.
非限制性定语从句中as和which都可以指代前面整个主句。
如果有“正如，象”的含义，并可以放在主句前，也可以放在后面，那么用as；而which引导的从句只能放主句后，并无“正如”的意思。
They won the game, as we had expected. They won the game, which we hadn’t expected.
As is well known, he is a famous film star in the 1980s.
IV. 限制性定语从句与非限制性定语从句的区别：
类别语法意义及特征例句
限制性定语从句对先行词起修饰限制作用，如果去掉，主句意思就不完整明确，这种从句与主句的关系十分密切，写时不用逗号分开。
The accident happened at the time when I left.
非限制性定语从句对先行词作附加的说明，与主句的关系不十分密切，较松散。
从句和主句之间用逗号分开，相当于一个插入语，不能用that引导，关系代词做宾语时也不能省略。
His mother, whom he loved deeply, died ten years ago.。