初中英语语法——三大从句汇总在英语中，主要有三大从句，即名词性从句（包括主语从句，宾语从句，表语从句，同位语从句）、形容词性从句（即定语从句）、副词性从句（即状语从句,包括时间、条件、结果、目的、原因、让步、地点、方式等）。
以下是一些基本的从句知识点A、定语从句专项讲解与训练一、定语从句概念定语从句（attributive clause），顾名思义，就是一个句子作定语从属于主句。
定语一般是由形容词充当，所以定语从句又称作形容词从句。
另外，定语从句是由关系代词或关系副词引导的，故又称作关系从句。
关系词常有3个作用：1，引导定语从句。
2，代替先行词。
3，在定语从句中担当一个成分。
定语从句一般放在它所修饰的名词或代词之后，这种名词或代词被称作先行词。
请看示例：The woman who lives next door is a teacher.先行词定语从句在所有的从句中，算定语从句最难掌握，因为汉语里没有定语从句，汉语里只有定语，而且总是放在名词之前来修饰名词。
二、关系代词引导的定语从句关系代词代替前面的先行词，并且在定语从句中充当句子成分，可以作主语、宾语、定语等。
常见的关系代词有：who, that, which。
它们的主格、宾格和所有格如下表所示：格先行词主格宾格所有格人who whom whose物which which whose 、of which人、物that that —（一）关系代词who, whom和whose的用法1）who代替人，是主格，在定语从句中作主语。
例如：An architect is a person who designs buildings. 建筑师是设计房屋的人。
I will never forget the teacher who taught us chemistry in the first year of my senior middle school. 我将永远不会忘记在高一时教我们化学的那位老师。
Anyone who wants to apply for this job must send us the resume by email first. 想应聘这个职位的任何人都必须先通过电子邮件向我们发送简历。
2）whom代替人，是宾格，在定语从句作宾语，在非正式英语常可省略。
例如：Do you know the gentleman whom we met in the school library yesterday? 昨天我们在学校图书馆里遇到的那位先生你认识吗？This is the student whom my father taught ten years ago. 这是我爸爸十年前教的学生。
The girl who I saw is called Mary. 我见到的那个女孩名叫玛丽。
（在非正式英语中，主格who代替了宾格whom，亦可省略）3）whose一般代替人，有时亦可代替物，是所有格，在定语从句作定语。
例如：The girl student whose father is a senior engineer used to study abroad.其父是一位高级工程师的那个女学生过去在国外留学。
Do you know the name of the hotel whose window we can see here? 我们这儿能看到窗户的那个宾馆叫什么名字，你知道吗？（关系代词whose指代先行词hotel，正式用法应该用of which。
whose window=the window of which，意思是：the window of the hotel。
）（二）关系代词which的用法which代替物，在定语从句作主语或宾语，作宾语时还可省略。
例如：I do not like stories which have unhappy endings.我不喜欢有不幸结局的小说。
（which可以换成that）Tom works for a factory which makes watches.汤姆在一个制表厂工作。
（which可以换成that）（三）关系代词that的用法that既可指人又可指物，在当代英语中大多指物，在定语从句作主语或宾语，作宾语时还可省略。
例如：Is she the girl that sells newspapers?她是卖报纸的那个女孩吗？（that可以换成who）Where is the ice-cream that was in the fridge?放在冰箱的冰激凌哪儿去了？（that可以换成which）Is this the book that you want to buy?这是你要买的那本书吗？（that可以换成which，在定语从句作宾语，还可以省略）三.介词+关系代词引导的定语从句关系代词在定语从句中做介词宾语时，从句常由介词+关系代词引导(1) the school (that/which) he once studied in is very famous.(2) the school in which he once studied is very famous.(3) tomorrow i will bring here a magazine (that/which) you asked for.(4) tomorrow i will bring here a magazine for which you asked.(5) we'll go to hear the famous singer (whom/that/who) we have often talked about.(6) we'll go to hear the famous singer about whom we have often talked.注意：1. 含有介词的动词短语一般不拆开使用，如：look for, look after, take care of等(1) this is the watch which/that i am looking for. (t)(2) this is the watch for which i am looking. (f)2. 若介词放在关系代词前，关系代词指人时用whom，不可用who或者that；指物时用which，不能用that；关系代词是所有格时用whose(1) the man with whom you talked is my friend. (t)(2) the man who/that you talked with is my friend. (f)(3) the plane in which we flew to canada is very comfortable. (t)(4) the plane in that we flew in to canada is very comfortable. (f)3.“介词+关系代词”前可有some, any, none, both, all, neither, most, each, few等代词或者数词(1) he loved his parents deeply, both of whom are very kind to him.(2) in the basket there are quite many apples, some of which have gonebad.(3) there are forty students in our class in all, most of whom are from big cities.解答"介词+关系代词"类型的定语从句题时，关键在于分析定语从句中的谓语动词（该动词是不及物动词）习惯上常与什么介词搭配使用。
这就需要同学们在平时学习时要注重某些不及物动词和介词惯用的情形，并要灵活运用。
例如：in the dark street, there wasn't a single person ________ she could turn for help.a. thatb. whoc. from whomd. to whom简析:本题定语从句中的turn 与介词to 构成固定短语"turn to sb. for help (向某人求助）"。
所以，d是正确选项。
四、关系副词引导的定语从句常用的关系副词只有三个：when, where, why，在定语从句中充当时间、地点和原因状语。
它们的用法大家不妨记住一个口诀：the time whenthe place wherethe reason why（一）关系副词when的用法关系副词when代替的先行词表示的是时间，when在定语从句作时间状语。
例如：In Beijing July and August are the months when it rains very often.北京的七月和八月是常下雨的月份。
（when先行词是months）Do you remember the day when we first went to the Summer Palace?你还记得我们第一次去颐和园的那一天吗？（when先行词是day，当代英语里when可以用that替代，这时关系代词that就变成了表示时间的关系副词）I haven’t seen her since the year when I left Tokyo.自从我离开东京的那一年我就一直没见到过她。
（when先行词是year，同样when可以用that代替）（二）关系副词where的用法关系副词where代替的先行词表示的是地点，where在定语从句作地点状语。
例如：During the Spring Festival I went back to the town where I was brought up. 春节期间，我回到了生我养我的家乡。
（where的先行词是town）This is the place where Li Bai once lived.这是李白曾经生活过的地方。
（where先行词是place）上面这个句子不可以将where改为that，因为that不能作为表示地点的关系副词。
试比较下句：This is the place that Li Bai once visited.这是李白曾经游览过的地方。