定语从句用法总结一.定义：定语由一个句子来充当，那么这个句子就叫做定语从句。

eg: The old town has narrow streets and small houses that are built close to each other.其中划线部分为定语从句。

二.分类：分为限制性定语从句和非限制性定语从句，还有间隔性定语从句。

eg: is the school (that/which)we visited last year. （限制性定语从句）weather turned out to be very good,which was more than we could expect. （非限制性定语从句）days are gone when physical strength was all you needed to make a living.（间隔性定语从句）]注：定语从句和非限制性定语从句的区别限制性定语从句无逗号隔开、不可缺少、起修饰限制作用；而非限制性定语从句有逗号隔开、可有可无、起补充说明作用。

三.构成：定语从句有先行词、引导词和从句构成。

先行词是定语从句所修饰限制的名词或代词。

引导词是用来引导定语从句的关系代词或关系副词。

eg: The old town has narrow streets and small houses that are built close to each other.此句中先行词为：narrow streets and small houses,(引导词为：that，定语从句为：that are built close to each other四．基本原则定语从句中不能出现与先行词在意义上相一致的词is the book that I like it best .(it 与book指同一物，所以要去掉。

)五．定语从句中常见考点：考点一.关系代词和关系副词的辨别@1. 关系代词that（人、物），which（物）、who(m)（人）、whose（某人的，某物的）、as2. 关系副词when（表时间）、where（表地点）、why（表原因）注：关系副词可变为“介词+关系代词”结构（即：关系副词=介词+关系代词）。

eg:This is the mountain village where(=in which)I stayed last month.3. 怎样选择正确的关系代词或关系副词方法一：找出先行词和定语从句中动词，看定从中动词与先行词能否构成习惯搭配。

能，用关系代词；不能，用关系副词.will never forget the day that I spent with my parents.(定从中动词spent 与先行词the day 构成spent the day ,所以用关系代词that或which或省略)方法二：找出先行词和定语从句，看定语从句是否缺少主语、宾语或表语，如缺少，用关系代词。

如不缺少，定语从句所表达意思相对完整，用关系副词。

…eg:①.This is the factory ____ made cars . (缺少主语，所以用关系代词that 或which，作主语不能省略)②.This is the reason _______ he was late for school.(定语从句he was late for school 表达意思相对完整，所以用关系副词why 或介词+关系代词for which)注意：当先行词为case、position、point、situation、society、activity等抽象意义的名词时，常用关系副词where引导定语从句.eg:He got himself into a dangerous situation where he may lose control of the plane .考点二. 定从中that 与which的区别1. 关系代词只用that的情况。

（1）当先行词为不定代词（all、much、little、few、some、any、none、one、something、anything、everything等）或先行词被不定形容词（all、many、some、few、little等）修饰时。

|eg:Do you have anything that you want to say for yourself（2）当先行词既有人又有物时。

eg:Do you know the things and persons that you are talking about.（3）当先行词含有序数词或最高级时。

eg: ①This bus is the first that will go to Beijing.②This is the best movie that I have ever seen.（4）当先行词被only、very、next、last等修饰时。

eg:This is the very book that I’m looking for.>（5）在who或which引导的特殊疑问句中。

eg:Which is the bike that you lost（6）当关系代词在定语从句中作表语时。

eg:Zhengzhou is no longer the city that it used to be.2.关系代词只用which的情况。

（1）引导非限制性定语从句时。

eg:He turned to be a very successful man,which was more than we expected.》（2）在“介词+关系代词”结构中，关系代词只用which。

eg:This is the question about which they have so much discussion in the past few weeks.（3）当关系代词后有插入成分时。

eg: Mary was much kinder to Jack than she was to the others, which, of course, made all the others upset.3.指人时，关系代词只用who(m)的情况。

（1）引导非限制性定语从句时。

eg:She has a daughter,who is a doctor in the famous hospital.~（2）当“介词+关系代词(宾格形式)”结构引导定语从句时。

eg: The gentleman about whom you told me proved to be a thief.（3）当关系代词后有插入成分时。

eg:This is my friend who,I think,is the best in our class. .（4）在There be句型结构中，先行词指人时。

eg:There is a young lady who asks for you.考点三：as的用法及as与which的区别[1. as引导的定语从句（1）as常用于固定搭配中：the same. . . as，such…as，as/so…aseg:①.Zhengzhou is such a wonderful city as everyone likes to visit.比较：Zhengzhou is such a wonderful city that everyone likes to visit it.注意：第一句是定语从句，所以定从中没有出现与先行词city 意义上一致的词，第二句是状语从句，that 后应为完整句子，所以it 不能省略。

②.Today I bought the same bike as Tom did last week .(同样的但不是同一辆)比较：Today he wears the same coat that he did yesterday .（同一件衣服）（2）$（3）as常用于固定句型中：as we all / everyboby know(s), ,as is often the case,as we expect等。

eg:As we all know,Zhengzhou is an attractive city.2.在非限制性定语从句中，as与which的区别⑴指代整句话内容时，as可位于主句前面、中间或后面；而which一般位于主句后。

另外，which还可指代一个名词或一个短语。

eg①: As we all know,Tom is a good boy.②：China,which was founded in 1949,is becoming more and more powerful.③：She doesn't think she is wrong,which makes her teacher angry.（which指代上文整个句子）、⑵.as在句中有正如之意，而which没有，eg: ①He succeeded this time,as had been expected.②She has made great progress,which makes her parents very happy.③As we all know,knowledge changes life.考点四. 定从中所属关系的表达whose引导定语从句时必须和名词放在一起。

whose+n(s)?=the+n(s)+of which/whom=of +which/whom+the+n(s) eg:The house whose roof was damaged has now been repaired.= The house the roof of which was damaged has now been repaired.= The house of which the roof was damaged has now been repaired.考点五．定从中动词形式与先行词的一致eg: ①He is one of the students who fail the exam.'②He is the only one of the students who fails the exam.③Those who are fond of studying do well in exams.考点六. the way作先行词引导定从时，关系词可用in which/that/省略。