1.用关系代词引导的的定语从句1)This is the thief (that/who/whom) we are looking for these days.2)They rushed over to help the man whose car had broken down.3)Please find a room which is big enough for all of us to live in.2.关系代词只能用that的情况1) 先行词是all, the only, the very, no, any, few, little, nothing, everything, anything等不定代词。
Eg1. All that he said is true.Eg2. He is the only foreigner that has come here.2) 先行词是序数词the first, second, third, four, the last或被序数词修饰的词。
Eg. She was the second (person) that told me the secret.3) 先行词是形容词最高级或被最高级修饰的词。
Eg. This is the best book (that) I have read this year.4) 先行词又有人又有物的时候。
Eg. He talked about the people and the things that he remembered.5)先行词为way时的限定性定语从句由that, in which, Φ引导。
Eg1. I don’t like the way that you spoke. = I don’t like how you spoke.Eg2. The way in which he spoke to us was suspicious.3.先行词指人，关代只能用who的情况1)先行词是one, ones, anyone。
Eg. Anyone who breaks the law should be punished.2)先行词是those。
Eg. Those who want to see the film sign up here..4.先行词指物，关代只能用which的情况1) 非限定性定语从句Eg. The tree, which is four hundred years old, is very famous here.2) 介词后Eg. We depend on the land from which we get our food.5.关系代词在从句中作主语时一般用who指人，that指物。
Eg1. Do you know the woman who is weeping in the corner?Eg2. Do not tell me any words that have nothing to do with me.6.关系代词作从句的宾语时，常用which或whom,且关系代词常常省略。
Eg. I was invited by the host (whom I met) at Joe’s house.7.“介词+关系代词”引导的定语从句Eg. 关系代词在定从中作介词宾语时，从句常由“介词+关系代词”引出。
The school which he once studied in is very famous.= the school in which he once studied is very famous.1) 当关系代词紧跟在介词后面，必须用which或whom，而当介词移到句尾时，可以用that或who。
Eg. This is the room in which Miss Li once lived.= This is the room which Miss Li once lived in.2)含有介词的短语动词一般不拆开，介词仍放在短语动词后面。
Eg. Look for, look after, take care of Eg. This is the watch which I am looking for.3)代词/数词+介词+关系代词Eg1. He loves his parents deeply, both of whom are very kind to him.Eg2. China has a lot of islands, one of which is Taiwan.8.限定性定语从句遇非限定性定语从句限定性定从对被修饰的先行词有限定作用，使该词更具体明确，不能省略，否则主句句意不完整。
非限定性定从对被修饰的先行词作附加说明，不起限定作用，可以省略，主句句意仍完整。
Eg1. This is the telegram which he refers to. (限)Eg2. This note was left by Tom, who was here a moment ago. (非限)Eg3. She sang a song, which we liked very much.(非限)Eg4. The English party, which was held in our school, was good.(非限)·Multiple Choice 1-5DDDDA 6-10BABAC 11-12DC1.The thief (_______ stole the bicycle) has been caught.A.thatB.whichC.whoD.that or who2.Show me the road _______ leads to the railway station.A.thatB.whichC.whoD.that or which3.He (_______ does his best) should be rewarded.A.whoB.thatC.whichD.who or that4.My grandfather (_______ I loved) is dead.A.whoB.thatC.whichD.whom5.Kalidas, _______ wrote some fine dramas in Sanskrit, is often called the Shakespeare of India.A.whoB.whichC.thatD.who or that6.He is a rogue (_______ no one trusts).A.whoB.whomC.thatD.which7.That boy (_______ you see there) sings very well.A.whomB.thatC.whichD.whom or that8.Coal,( _______ is a very useful mineral,) is found in many parts of India.A.thatB.whichC.whoD.who or that9.John (_______ sings very well) is popular among the girls.A.whoB.whichC.thatD.who or that10.We bought some apples from _______ we extracted the juice.A.whoB.whomC.whichD.whose11.I have two grammar books, _______ are of great use.A.all of whichB.both of thatC.either of whichD.both of which12.This is one of the best films ____________.A.that have been shown this yearB.which have been shown this yearC.that has been shown this yearD.which has been shown this year13.The only thing _______ we can do now is to keep calm. that14.The flowers (_______ you bought yesterday) were placed in the bedroom. that/which15.It is one of the best films _____ I ever seen. that16.The girl (____ is sitting under the big tree) is Mary’s cousin. who17.He has a dog (_____ can run very fast). which/that18.Mary has an uncle _____ store is in Taipei. whose19.I still remember the college and the teachers (_____ I visited in London years ago). whom20.The lady (_____ was here last week) is my best friend. who/that21.A Bite of China is the most funny one (______ I have ever seen). that22.Tommy couldn’t stop thinking about the boy (______ made him a fool in the whole of class). who23.My neighbor is the man (____ T-shirt is red). whose24.He failed in the examination, _____ made his father very angry. which25.He talked a lot about things and persons ______ they remembered in America. that26.Some of the roads were flooded, ______ made our journey more difficult. which27.I know a man (_____ doesn’t work very hard). who28.I don’t like animals _____ have four legs. which/that29.The students (_____ came to school late) have to stand outside.·Combine the sentencesShe likes the student.The student gave some flowers to her.Example: She likes the student who gave some flowers to her.1.I don’t know the man.The man is talking to Mary.I don’t know the man who is talking to Mary.The man that I don’t know is talking to Mary.2.The man is my father.The man is reading a newspaper.The man who is reading a newspaper is my father.3.The boy is Tom.The boy likes to talk in class.The boy (that/who likes to talk in class) is Tom.4.Take the pencils.The pencils are in my pencil box.Take the pencilswhich are in my pencil box.5.I have a class.The class begins at 8:00 in the morning.I have a class that begins at 8:00 in the morning.6.The ball is red.The ball is under the tree.The ball that/which is under the tree is red.7.I read the book.The book is about animals._ I read the book that is about animals.。