定语从句不用that的情况
英语定语从句中that和which的区别有哪些？
【导语】很多同学可能都会觉得在使⽤定语从句的时候，有时不知该选择that还是which作为引导词。
那么，今天和⼀起来了解下定语从句中that和which的区别，以下内容由整理发布，欢迎阅读参考！更多相关讯息请关注！⾸先，that和which在从句⾥都可以做宾语和主语，做宾语时可以省略。
在定语从句中,有种说法叫"关宾省",意思是关系代词在限制性定语从句中作宾语可以省略,不管是that，which，还是whom。
但是which能引导⾮限制性定语从句，that则不⾏。
其次，记得以下只能⽤that的⼏种情况：1. 当先⾏词为all, much, little, none及由any, every, some, no所构成的复合不定代词时。
如：We should do all that is useful to the people. 我们应该做⼀切有益于⼈民的事情。
Please tell me anything that you know about the matter. 有关此事，凡是你所知道的请告诉我。
2. 当先⾏词被any, few, little, no, all, much, some等词修饰时。
如：You can take any seat that is free. 任何空着的座位你都可以坐。
There is little work that is fit for you. ⼏乎没有适合你的⼯作。
3. 当先⾏词为序数词或被序数词所修饰时。
如：When people talk about the cities of China, the first that comes to my mind is Beijing. ⼈们谈论起中国的城市的时候，我⾸先想到的是北京。
This is the fourth film that has been shown in our school this term. 这是我们校本学期放映的第四部电影。
定语从句中引导词的特殊用法
一先行词指物的特殊情况：一．必须用that的情况：1. 先行词被序数词、形容词的最高级修饰时，eg. This is the first job that I have taken up.This is the most interesting novel that I have ever read.2. 先行词是不定代词,something somebody nothing anything 等或是all little much 时，eg. There is something that I want to tell you.3. 先行词被all/ any/ every/ each/ few /little/ no/ some/ much/ only/ none/ both/ either/ neither 等修饰时，eg. I have read all the books that you lent me.4. 先行词被the only, the last, the very…修饰时,eg. This is the only method we can use.5. 先行词又有人又有物时，eg. They talked about things and persons that they know in the school.6. 主句以who 或which开头时，eg. Who is the old man that speak to you just now ?二、修饰物时只用which不用that的情况1，引导非限制性定语从句时。
例如：Bamboo is hollow, which makes it light.竹子是空心的，这使得他很轻。
2，当关系词前有介词时。
例如：This is the room in which Chairman Mao once lived.这就是毛主席曾经住过的地方。
定语从句关系词特殊情况
定语从句关系词一、先行词指物，只用that不用whi ch的特殊情况：1、先行词是不定代词all, little, few, someth ing等或被不定代词any, each, every, much, (a) little, (a) few等修饰时。
Eg. Do you have anythi ng that I can do for you? / Thereis much (work) that he can do here.2、先行词是形容词最高级或被最高级所修饰时。
Eg. This is the most intere sting storythat I have heard.3、先行词是序数词（以及last）或被序数词所修饰时。
Eg. This is the firstcity that I visite d in China.4、先行词前有t he very, the only, the just等修饰时。
Eg. This is the very pen that I lost yester day.5、一个句子带有两个定语从句，一个已用wh ich, 为避免重复，另一个只能用that。
Eg. They builtup a factor y whichproduc ed things that sold well.6、先行词既有人又有物时。
Eg. Do you rememb er the things and person s that we oftentalked aboutin our childh ood?7、主句是以wh o或whi ch开头的特殊疑问句时。
Eg. Who is the girl that is standi ng there? / Whichis the car that you bought last night?注：当先行词指人时，除了第6、7条以及有t he same修饰不能用wh o之外，其他情况既能用that又能用wh o/ whom引导。
定语从句只用which不用that的情况
定语从句只用which不用that的情况英语语法是针对英语语言进行研究后，系统地总结归纳出来的一系列语言规则。
以下是店铺整理的定语从句只用which不用that的情况，希望能够帮助到大家。
Which 和that同为关系代词，都可指物，并且有时会觉得用that 也可以，用which 也没错。
但在哪些情况下是只能用which的呢？1.在非限定性定语从句中，无论如何也不能用thatA.This brunch of carnation, which is wound by silk ribbon ,is the first gift to my mom.这束康乃馨是送给妈妈的第一份礼物，它被丝带所缠绕。
B.These books,which you can get at any corner of the town will give you all the information.这本书你可以在镇里的各个角落获取得到，它会给你所有的`信息。
2.关系代词前面出现介词时A.Those days in which you could travel without a passport has gone.那些你不用带护照可以旅行的日子一去不复返了。
B.That`s the motel at which we stayed several years ago.那是我们许多年以前停留的汽车旅馆。
（此处which不可替换为that）3.当先行词本身为that（指代）时A.what about that which had appeared in recent activities.那个怎么样，在最近的活动中出现过. (结合具体语境看that所指代的是什么)B.The knowledge are from various fields and that which display the waves of human being.知识来自不同领域并且它也彰显这人类的智慧。
限制性定语从句与非限制性定语从句
∙非限制性定语从句的概念：非限制性定语是对被修饰名词或代词的附加说明，它不是必需的，如果去掉，也不会影响句子的意思，它与被修饰名词之间通常用逗号分开。
如：The travellers, knowing about the floods, took another road. 游客们知道发了大水，都改道走了。
The boys, wanting to play football, were disappointed when it rained. 那些男孩子想踢足球，因为下雨感到失望。
∙非限制性定语从句用法：1、引导非限定性定语从句时，只能用which(不用that)。
例如：Heat is another form of energy, which is as important as other kinds of energy.热是另一种形式的能量，与其他形式的能量一样重要。
（从句表补充说明，而且关系代词which不能换成that。
）2、引导非限定性定语从句的which可以指代前面的先行词,也可以指前面整个句子的含义。
例如：That Peter will marry Alice, which has not been announced yet, has spread around.彼特要娶爱丽斯这件事还没宣布，却已传得沸沸扬扬。
（句子中的which指“彼特要娶爱丽斯”这整个句子的意思。
）3、除which外，还可用when，where，who等关系代、副词引导非限定性定语从句。
例如：After graduation, I decided to stay in Chongqing, where I spent my childhood and four years of college life.毕业后，我决定留在重庆，在那里我曾度过了我的童年和四年大学生活。
Albert Einstein left Germany for the United States during World WarII, when Jews were badly treated in Germany.第二次世界大战期间，爱因斯坦离开德国去了美国，那时犹太人在德国受到不好的对待。
定语从句中that_与who一些特殊用法
You should hand in all that you have.
6,先行词前面有only,any,few,little,no,all,one of,the same,the very等词修饰时。
Those who want to go to the Great Wall sign up here.
3，先行词有较长的后置定语时，宜用who。
I met a foreign in the street yesterday who could ask me question in chinese.
2,先行词是序数词，或它前面有一个序数词时。 3，主句有疑问词who或which时。
Which is the biLeabharlann e that you lost ?
4，先行词有人又有物时，宜用that。
The bike and its rider that had run over an old man were taken to police station.
Li Ming is the only one that wants to be a teacher .
7,有两个定语从句，其中一个关系代词已用 which，另一个宜用that。
Edison bulit up a factory which produced things that had never been seen before.
二、先行词指物，用that不宜用which的情况。
1，先行词是形容词最高级或它的前面有形容词最高级 时。
不定代词定语从句
不定代词定语从句 ⼤家了解不定代词定语从句⽤法吗？以下是店铺分享的不定代词定语从句⽤法，欢迎⼤家阅读参考！ ⼀、不定代词定语从句⽤法 在限制性定语从句中,当先⾏词指⼈时,关系词可⽤who(作宾语是还可⽤whom)或that,⼆者常可互换. 但在下列情况中,⽤who(m),⽽不⽤that： (1) 当先⾏词是one,ones,any,few,anyone,anybody,someone,somebody,everyone, everybody等词时.如： Is there anyone who can answer this question? He was among the few who managed to live through the enemy prison camp. 注：在⾮正式⽂体中可以说：You’re the one that knows where to go.) (2) 当先⾏词是he,they,those,people,person等词时.如： He who wants to catch fish just not mind getting wet. Those who are against the proposal put up your hands. 注：在固定结构的谚语或习语中,可⽤he that….如： He that promises too much means nothing. (3) 当先⾏词有较长的后置定语修饰时.如： Do you know the writer in blue with thick glasses who is speaking at the meeting? (4) 在分隔式定语从句中,若先⾏词指⼈,为了明确修饰关系,应当⽤who(m).如： A new master will came tomorrow who will teach you German. There’s only one student in the school who/whom I wanted to see. I was the only person in my office who was invited. (5) 两个定语从句同时修饰⼀个指⼈的先⾏词,第⼆个定语从句常⽤who(m)来引导,如： She is the only girl I know who can play the guitar. ⼆、定语从句⽤法归纳 定语从句由关系代词who、whom、whose、which、what、as和关系副词where、when、why等引导，但须记住： 1.what不能引导定语从句. 2.关系词的分析须考虑它在定语从句中的成分。
定语从句中which与that适用情况
修饰物时只用which不用that的情况1、引导非限制性定语从句时。
例如：Bamboo is hollow, which makes it light.竹子是空心的，这使得他很轻。
2、当关系词前有介词时。
例如：This is the room in which Chairman Mao once lived.这就是毛主席曾经住过的地方。
3、在一个句子中有两个定语从句，其中一个定语从句的关系代词用了that, 另一个宜用which.例如：Let me show you the novel that I borrowed from the library which was newly open to us.我来给你看我从新开的图书馆里借来的那本小说。
4、当关系代词后面有插入语时。
例如：Here is the English grammar which, as I have told you, will help improve your English.这就是我跟你说过的会有助于你学好英语的那本英语语法书。
5、先行词为that时。
例如：The clock is that which can tell us the time.钟是报时的装置。
附：只用that不用which的情况一、先行词为不定代词,all, much, something, everything, anything, nothing, none, the one等。
例句：Have you got something (that) he wanted? 你已经得到他想要的东西了吗?二、先行词被only, any, few, little, no, just, very, one of等词修饰时。
例句：You can keep any books that you find. 你可以保留你找到的任何书。
三、先行词是序数词时或被序数词修饰时。
定语从句是高中英语三大类从句中最难的一类其难点主要在
定语从句是高中英语三大类从句中最难的一类，其难点主要在于很多学生在学习时分不清先行词，不能正确使用关系代词、关系副词。
因此在学习定语从句时，务必搞清定语从句的概念、关系词的正确选择和使用情况等。
2018年高考定语从句的考查还将是对关系代词和关系副词的考查。
对定语从句的考查仍将不会单纯考查其语法结构，而是将其融入一定的语境中来考查考生的实际综合运用能力。
定语从句是高考的热点，对于定语从句考纲要求掌握以下内容：1.引导限制性定语从句的关系词；2.引导非限制性定语从句的关系词；3.限制性与非限制性定语从句的区别；4.介词+关系代词的用法；5.不定代词/数词+of which/whom引导的非限制性定语从句及其该结构与并列句的判断；6.关系词之间的异同现象及选用。
考点1：关系代词一览表关系词先行词从句成分例句备注关系代词who人主语Do you know the man who is talkingwith 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 amworkingThe boy (whom) she loved died in thewar.whose 人，物定语I like those books whose topics are abouthistory.The boy whose father works abroad ismy desk mate.that 人，物主语宾语A plane is a machine that can fly.She is the pop star (that) I want to seevery much.考向预测考点定位which 物主语宾语The book (which) I gave you was worth$10.The picture which was about theaccident was terrible.as 人，物主语宾语He is such a person as is respected by allof 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 metthere.可用onwhich 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 imagine the reason why he turneddown my offer.可用forwhich【典例】In 1963 the UN set up the World Food Programme, one of ________ purposes is to relieve worldwide starvation.A. whichB. itsC. whoseD. whom【答案】C【解析】考查定语从句。
定语从句中省略的情况
定语从句中省略的情况定语从句中省略的情况在复合句中，修饰某一名词或代词的从句叫定语从句。
被修饰的名词或代词叫先行词，定语从句一般放在先行词的后面。
以下内容是店铺为您精心整理的定语从句中省略的情况，欢迎参考！定语从句中省略的情况一Which 和that同为关系代词，都可指物，并且有时会觉得用that 也可以，用which 也没错。
但在哪些情况下是只能用which的呢？1.在非限定性定语从句中，无论如何也不能用thatA.This brunch of carnation, which is wound by silk ribbon ,is the first gift to my mom.这束康乃馨是送给妈妈的第一份礼物，它被丝带所缠绕。
B.These books,which you can get at any corner of the town will give you all the information.这本书你可以在镇里的各个角落获取得到，它会给你所有的信息。
2.关系代词前面出现介词时A.Those days in which you could travel without a passport has gone.那些你不用带护照可以旅行的日子一去不复返了。
B.That`s the motel at which we stayed several years ago.那是我们许多年以前停留的汽车旅馆。
（此处which不可替换为that）3.当先行词本身为that（指代）时A.what about that which had appeared in recent activities.那个怎么样，在最近的活动中出现过. (结合具体语境看that所指代的是)B.The knowledge are from various fields and that which display the waves of human being.知识来自不同领域并且它也彰显这人类的智慧。
定语从句中先行词指人时,who 和 that 的区别
定语从句中先行词指人时，who 和that 的区别who (whom) 和that的用法区别详解在定语从句中，关系代词who (whom) 和that都可指人和物，在一般情况下，能够互换使用，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)。
如：My sister, who is studying abroad, sent me a beautiful present just before this Christmas. 我姐姐，她在国外学习，就在圣诞节前给我寄来了漂亮的礼物。
(2) 当定语从句对指人的先行词实行隔位修饰时，只能用who (whom)。
如：Do you know the girl in front of the blackboard who is speaking to the students? 你理解黑板前面正在给学生们讲话的那位女孩子吗？(3) 当先行词为people和those时，只能用who (whom)。
如：Those who want to go there come here please. 那些想去那儿的人请来这边。
(4) 当先行词为one, ones, anyone, everyone, none, all(指人) 时，只能用who (whom)。
如：Anyone who is against us is our enemy. 任何反对我们的人就是我们的敌人。
(5) 先行词指人，而关系代词在从句中作主语时，一般多用who。
如：The man who came here yesterday said he would come again in a few days. 昨天来这儿的那个人说过几天他会再来。
(6) 在there be句型中名词的定语从句多用who (whom)。
定语从句的特殊用法
定语从句中的特殊用法定语从句是起定语作用的,修饰,说明名词,代词或句子内容的从句,被定语从句修饰的词叫做先行词。
引导定语从句，并在句中担任成分的词叫做关系代词或关系副词。
定语从句是高考常考内容之一，使用时要尤其注意以下十种特殊用法。
一、只用that不用which的情况1、当先行词是al l, little, few, much, somethi ng, everyth ing, anythin g, nothing, none等不定代词时。
如： Everyth ing that happene d then was like a nightma re.当时发生的一切就像是一场噩梦。
I will tell him all that you told me at the ball.我要把你在舞会上跟我说的话全都告诉他。
2、当先行词被on ly, any, few, little, no, all, just, very（恰好的,表示强调）等词修饰时。
例如：The only thing that we could do was to wait.我们能做的只是等待。
That’s the very thing that we can do.那正是我们能做的事。
3、当先行词是序数词、形容词最高级或先行词被序数词或形容词最高级修饰时。
例如：The first place that we visited was the Great Wall.我们参观的第一个地方是长城。
This is the best novel that I have ever read.这是我看过的最好的小说。
4、被修饰词为数词时。
例如：Yesterd ay I caughttwo fish and put them in a basin of water. Now you can see the two that are still alive. 昨天我捉到了两条鱼，把它们放在一盆水里。
which that的用法
which that的用法which和that都可指代物，有时候可以互换，有时却只能用其一：一、只用that不能用which的情况：（1）先行词被序数词或形容词最高级所修饰，或本身是序数词、基数词、形容词最高级时：The most important thing that we should do is to study hard.我们要做的最重要的事情就是努力学习。
（2）被修饰的先行词为all/ any/ much/ many/ everything/ anything/ none/the one等不定代词时：Is there any thing that you want to buy?你有什么东西要买吗？（3）先行词被the only/ the very/ the same/the last/ little/ few等词修饰时：This is the same book that I lost.这就是我丢的那本书。
（3）先行词里同时含有人和物时：I can remember the persons and some pictures that I saw in the room.我能清楚记得我在那个房间所见到的人和一些照片。
（4）避免重复：Which is the pen that belongs to you?哪支笔是你的？（5）主句是there be结构：There is a pen on the desk that belongs to Tom.桌子上那支笔是汤姆的。
二、只用which，而不用that的情况：（1）先行词为that/ those时：What’s that which is under the desk？在桌子底下的那些东西是什么？（2）关系代词前有介词时：This is the city in which he lives.这是他生活的城市。
（3）引导非限制性定语从句：Tom passed the exam, which made us surprised.汤姆通过了考试，这使我们很惊讶。
定语从句用什么引导
定语从句用什么引导定语从句用什么引导定语从句用引导？相信很多人都想知道吧？以下是店铺为您整理的定语从句用什么引导相关资料，欢迎阅读！定语从句用什么引导一、定语从句的引导词有关系代词who,whom,whose,which,that,as；关系副词when,where,why.定语从句中引导词的选用主要看先行词在定语从句中作什么成分或者是定语从句中缺什么成分.1．定语从句中缺主语,修饰人时用who ／that,修饰物时用which ／that引导.如：Is this the factory which ／that makes TV sets?The man who ／that visited our school is from Australia．2．从句中缺宾语,修饰人时用 who ／whom ／that或省略引导词；修饰物时用which ／that或省略引导词.如：Gone are the days which ／that we spent together in the village．He is the man who ／whom ／that I think to be worthy of our praise．3．从句中缺时间状语,用when或介词＋which引导.如：The day finally came when ／on which I was given a job．We'll put off the outing until next week,when we won't be so busy．4．从句中缺地点状语,用where或介词＋which引导.如：Please put the letter on the desk where ／on which he can easily find it．5．从句中缺原因状语或先行词是reason时,引导词用why ／for which ／ that.如：This is the reason why ／for which ／ that he didn't come tothe meeting．6．从句中缺定语,人和物都用 whose引导.如：A child whose parents are dead is called an orphan．Please pass me the dictionary whose cover is black．7．当先行词是way时,其定语从句的引导词用in which ／that.如：The way in which ／that he looks at problems is wrong．二、引导词as可引导限制性定语从句,也可引导非限制性定语从句.1．在固定词组the same．．．as,such．．．as中,as引导限制性定语从句.如：He is not such a fool as he looks．I've bought the same dress as she is wearing．2．当先行词是整个主句时,可用as ／which引导非限制性定语从句.引导词as和which的区别在于：①as引导的非限制性定语从句可放于主句前、主句中、主句后,而which引导的非限制性定语从句一般放于主句后或句中.②as常与从句中的know,see,hear,expect等动词连用,也常用于as often happens,as is often the case（常有的`事）等句子中；而which一般不用于以上情况.③as有“正如”的含义,which没有此含义.如：As is well known,Shanghai is a big city．Some of the roads were flooded,which made our journey more difficult．三、关系代词who,whom,whose,which和as能引导非限制性定语从句,而that不能；非限制性定语从句中即使缺宾语,引导词也不能省略；关系副词when,where能引导非限制性定语从句,而why不能.如：Abraham Lincoln,who led the United States through the Civil War years,was shot on April 14,1865．四、先行词是物时,其引导词可用 which也可用that,通常情况下二者可互换,但在有些情况下不能.1．用which不用that引导定语从句的三种情况：①非限制性定语从句用which,不用that引导.如：Football,which is a very interesting game,is played all over the world．②先行词为that时,为了避免重复,定语从句用which不用that引导.如：That which you borrowed from me wasn't a real diamond necklace．③介词后用which不用that引导.如：The method with which you solved the problem is very good．2．用that不用which的七种情况：①先行词前有形容词最高级或序数词修饰时,用 that不用which引导.如：This is the best place that I have ever visited．The second question that is asked is why we don't fall off the earth．②先行词为little,much,all,none,few,（the）one,something,everything,nothing,anything等不定代词时,用that 引导.如：There is nothing in the world that can frighten him．③先行词既有指人的名词又有指物的名词时,用 that引导.如：He told us about the people and the cities that he had visited．④先行词前有any,all,no,few,every,some,little,much,（the）very,（the）only,（the）last等词修饰时,用 that引导.如：This is the very coat that I need．Is oxygen the only gas that helps fire burn?⑤先行词为which时,为了避免重复,用that引导.如：Which is the book that you bought yesterday?⑥先行词在从句中作表语时,常用that引导.如：Shanghai is no longer the city that it used to be in the 1930's．⑦当主句是There be．．．句型时,用that引导.There are two tickets for the film that are for you two．五、在“one of＋复数名词＋定语从句”结构中,从句的谓语动词应与复数名词保持一致；当one前有the only修饰时,从句的谓语动词应与the only one保持一致.如：He was one of the students who were late for class．He was the only one of the students who was late for class．六、引导词前有介词或短语介词时,修饰人只能用 whom,修饰物只能用which引导.如：My glasses,without which I was like a blind man,fell to the ground and broke．The man,by whom the wolf was shot,is called Jackson．【定语从句用什么引导】。
who引导定语从句
who引导定语从句关系代词who与that的用法区别两者都可用作关系代词指人,who引导定语从句的用法。
定语从句中只用who不用that的情况在定语从句中who和which都是关系代词，都在句中作主语，that除作主语以外还可以作宾语，指代人或物，而who只能指人。
在接下来的讲解中会看到只用who不用that的情形。
1.只指人，并且在从句中作主语的情况A.The man who is a new one has rent a flat in downtown of New York for a long time.新来的这个人在纽约市中心租了一栋公寓，有一段时间了。
（the man 指人并在句中作主语）B.The girl who has looked for a job with the help of her tutor is fortunate.这个女孩在导师的帮助下找到了一份工作，她是幸运的。
（the girl 指人并在句中作主语）C.The professor who wrote a book is teaching history.写这本书的专家正在教历史。
（the professor既指人又在句中作主语）2.在非限定性定语从句中作主语，并指人时A.He feel honored to work with Mr.Li, who has good reputation in the business.他感到很荣幸和李先生一起工作，李先生在业界有着良好的声誉。
B.Where is the girl, who was the witness in the severe accident.作为这场严重车祸的'目击者的这个女孩在哪？C.The scientists, who invented a kind of immune medicine.科学家发明了一种免疫性的药物。
3.先行词是god, angel,fairy等词时，用who不用that。
不定代词定语从句
不定代词定语从句大家了解不定代词定语从句用法吗？以下范文是店铺分享的不定代词定语从句用法，欢迎大家阅读参考！一、不定代词定语从句用法在限制性定语从句中,当先行词指人时,关系词可用who(作宾语是还可用whom)或that,二者常可互换.但在下列情况中,用who(m),而不用that：(1) 当先行词是one,ones,any,few,anyone,anybody,someone,somebody,everyon e,everybody等词时.如：Is there anyone who can answer this question?He was among the few who managed to live through the enemy prison camp.注：在非正式文体中可以说：You’re the one that knows where to go.)(2) 当先行词是he,they,those,people,person等词时.如：He who wants to catch fish just not mind getting wet.Those who are against the proposal put up your hands.注：在固定结构的谚语或习语中,可用he that….如：He that promises too much means nothing.(3) 当先行词有较长的后置定语修饰时.如：Do you know the writer in blue with thick glasses who is speaking at the meeting?(4) 在分隔式定语从句中,若先行词指人,为了明确修饰关系,应当用who(m).如：A new master will came tomorrow who will teach you German.There’s only one student in the school who/whom I wantedto see.I was the only person in my office who was invited.(5) 两个定语从句同时修饰一个指人的先行词,第二个定语从句常用who(m)来引导,如：She is the only girl I know who can play the guitar.二、定语从句用法归纳定语从句由关系代词who、whom、whose、which、what、as 和关系副词where、when、why等引导，但须记住：1.what不能引导定语从句.2.关系词的分析须考虑它在定语从句中的成分。
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定语从句不用that的情况定语从句不用that的情况定语从句中比较容易处理方面是，定语从句中“that”多可省略，表现为关系代词作宾语的情况，下面是店铺给大家整理的定语从句不用that的情况的相关内容，希望能给你带来帮助!（一）定语从句不用that的情况1、不能用that的情况介词前置时；非限定性定语从句中先行词本身是that多用who，不用that的情况先行词为anyone，one，ones时；先行词为those，he和people时；这些词代替指人，whom在定语从句中指人，"who"和“that”既可作主语又可作宾语（作宾语可以省略,who作宾语变为whom），that可以指人也可以指物, who不可指物。
在从句中所起作用如下：（1）Is he the man who/that wants to see you? 他是那个想见你的男人吗？（who/that在从句中作主语）（2）He is the man （whom/that） I saw yesterday. 他就是我昨天见到的那个人。
（whom/that在从句中作宾语）（3）The man whom you spoke to just now is our English teacher. 刚刚和你说话的那个男人是我们的英语老师。
（whom在从句中作宾语）注：who在定语从句中指人，作主语和宾语，作宾语时可省略；做及物动词或介词的宾语，可省略。
which，that 用来指物（有六种情况只可用that而不用which）(用作主语、宾语，作宾语时可以省略），例如：（1）The prosperity which/that had never appeared before took on in the countryside.农村出现了前所未有的繁荣。
（which/that在从句中作主语）（2）The package (which/that) you are carrying is about to comeunwrapped.你拿那个包裹快要散开了。
（which/that在从句中作宾语）注：which在定语从句中指物，可作主语或及物动词或介词的宾语，作宾语时可省略；that在定语从句中既可指人又可指物，在定语从句中作主语、宾语和表语，作宾语时可省略，指人时，相当于who 或whom，指物时，相当于which，作介词宾语时，介词不可提到that前，当介词提前时，需要用which或whom来代替。
2、whose(只用作定语)“whose”表示谁（可以为人也可以为物）的（东西）例：A child whose parents are dead is called an orphan.双亲都死了的孩子叫做孤儿。
（“whose parents”表示那个孩子的双亲）He lives in a room whose window faces south.他住的那个房子的窗户是朝南的。
（“whose”表示那个房子的窗户）关系代词：在句中作主语、宾语或定语。
1. that既可代表事物也可代表人，“which”代表事物；它们在从句中作主语或宾语，作宾语可省略“that”在从句中作宾语时常可省略关系词，“which”在从句省略。
[eg：This is the book （which）you want.]2.如果which在从句中作“不及物动词+介词”的介词的宾语，注意介词不要丢掉，而且介词总是放在关系代词which的前面，但有的则放在它前面的位置。
3. 代表物时的that常被省略；c）被形容词最高级修饰时；既有人又有物时；e）整个句中前面已有“which”，“why”时（二）定语从句中的that和which用法区别that和which在从句里都可以做宾语和主语，做宾语时可以省略。
在定语从句中,有种说法叫"关宾省"，意思是关系代词在限制性定语从句中作宾语可以省略，不管是that，which，还是whom。
但是which能引导非限制性定语从句，that则不行。
其次，记得以下只能用that的几种情况：1. 当先行词为all, much, little, none及由any, every, some, no 所构成的复合不定代词时。
如：Please tell me anything that you know about the matter.有关此事，凡是你所知道的请告诉我。
2. 当先行词被any, few, little, no, all, much, some等词修饰时。
如：You can take any seat that is free.任何空着的座位你都可以坐。
3. 当先行词为序数词或被序数词所修饰时。
如：This is the fourth film that has been shown in our school this term.这是我们校本学期放映的第四部电影。
4. 当先行词为形容词最高级或被形容词最高级修饰时。
如：This is the most interesting story book that I have ever read.这是我读过的一本最有趣的故事书。
5. 当先行词被the very, the only, the last, the just, the same等修饰时。
如：The only thing that we could do was to wait.我们唯一能做的事就是等待。
注意：先行词被the same修饰时，关系代词也可用as。
如：I need the same book that / as you have.我需要有你一样的书。
6. 当先行词既包含人又包含物时。
如：They are talking of the heroines and their deeds thatinterest them.他们正在谈论他们感兴趣的女英雄及她们的事迹。
7. 当先行词是疑问代词who，which，what或主句以这些词开头时。
如：Who that has ever worked together with him doesn’t admire him?曾经和他一起工作过的谁不钦佩他？8. 当先行词为主句表语或关系代词为从句表语时。
如：Our school is no longer the place that it used to be.我们的'学校现在已不是过去的那个样子了。
9. 先行词为time时，当time表示次数，引导词用that, 可省略。
当表示时间，可用that或when引导，都可省略。
如：I did't remember the exact time （when/that） I arrived in Shanghai last month.我不记得上个月到达上海的确切时间了。
最后，请注意以下几种只能使用which的情况:1. 在“介词＋关系代词”结构中，关系代词必须用which。
如：This is the reference book of which the teacher is speaking.这就是老师正在谈及的那本参考书。
注意：如果介词不放在修饰事物的限定性定语从句的句首，which就可换为that，例如：This is the question which/that we’ve had so much discussion about. =This is the question about which we’ve had so much discussion.这就是我们已经多次讨论过的问题。
2. 先行词为“thos e＋表事物的复数名词”时，关系代词通常只用which而不用that。
如：You should grasp well those skills which may be used in the future work.你应该掌握好这些可以用到未来工作中的技能。
最后，记得这个特殊情况吧：当先行词是表示原因或方式的名词时，可以用that引导定语从句，相当于介词+which，that可以省略。
如：He didn’t like the way that (=in which) she speaks to his mother.他不喜欢她对他的母亲那样说话。
Imagine the speed that (=at which) he drives the car.很难想象，他开车开得那么快。
（三）这种情况下定语从句中的that不可以省略！1. think it + adj + that在讲今天的语法之前，我们回顾一下平时同学们在写作以及阅读中可能比较疑惑的例句：I think it important that you tell your mother the truth.疑惑之处在于，it后面为什么没有is？例句采用了这样的句型：“think it + adj”。
此处，it为形式宾语，that引导的宾语从句才是真实宾语，而important是宾语补足语。
所以，it是形式宾语而不是主语，不需要加be动词。
一般情况下，各位更熟悉的句型是：“I think （that）it is important that... ”；这两者都是正确的，注意区分和辨别。
感兴趣的同学还可以去这个网站看看：English Language & Usage。
它给出了以下几个类似的例句：e.g. We do not think it necessary to go.e.g. Some people do not think it important to be thrifty.2. 定语从句中的that定语从句中比较容易处理方面是，定语从句中“that”多可省略，表现为关系代词作宾语的情况：e.g. He must be the man (that) you have been looking for.此处，man作looking for的宾语。
至于不可省略的that，这里店铺只举两例，算是比较常用的规则哦：（1）紧接着上面阐述，除了关系代词作宾语的情况外，其余时候多不能省略that。
比如店铺给各位找来一个作主语的例子，各位可以举一反三：e.g. All that glitters is not gold.（发光的未必都是金子。
）此处，that指代主语，不可以省略。
（2）我们都知道that引导定语从句，可指人也可指物，算是兼有“who”和“which”的作用；但当定语从句修饰的先行词既有人又有物时，那么就只能用that且不可省略了。