中考步步逼近，秦学教育小编在此给大家陆续整理初中英语核心语法。。而语法知识是在掌握一定量的单词和短语的基础上才能获得的。因此，单词的形态变化是语法学习的基础之基础。语法部分是英语学习的重点和难点。语法知识掌握得好，将大大加快英语学习的进程。来看基本从句----定语从句，步步为营学好英语。

　　定语从句

　　定语是指在句子中用来修饰名词、代词的成分。

　　如：I will give my teacher a bunch of beautiful flower.(中beautiful就是定语)

　　定语从句是指在一个句子中作定语的句子，定语从句要放在所修饰的词后

　　如：I have met the doctor who is in the No.1 hospital.

　　定语从句的连接词：

　　连接代词：who、which、whom、whose、that

　　连接副词：when、where、why#p#副标题#e#

　　1)who, whom, that

　　这些词代替的先行词是人的名词或代词，在从句中所起作用如下:

　　Is he the man who/that wants to see you?

　　他就是你想见的人吗?(who/that在从句中作主语)

　　He is the man whom/ that I saw yesterday.

　　他就是我昨天见的那个人。(whom/that在从句中作宾语)

　　2) Whose 用来指人或物，(只用作定语, 若指物，它还可以同of which互换), 例如:

　　They rushed over to help the man whose car had broken down. 那人车坏了，大家都跑过去帮忙。

　　Please pass me the book whose (of which) cover is green. 请递给我那本绿皮的书。

　　3)which, that

　　它们所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等，例如:

　　A prosperity which / that had never been seen before appears in the countryside. 农村出现了前所未有的繁荣。(which / that在句中作宾语)

　　The package (which / that) you are carrying is about to come unwrapped. 你拿的包快散了。(which / that在句中作宾语 18.2 关系副词引导的定语从句

　　关系副词可代替的先行词是时间、地点或理由的名词，在从句中作状语。

　　4)when, where, why

　　关系副词when, where, why的含义相当于"介词+ which"结构，因此常常和"介词+ which"结构交替使用，例如:

　　There are occasions when (on which) one must yield. 任何人都有不得不屈服的时候。

　　Beijing is the place where (in which) I was born. 北京是我的出生地。

　　Is this the reason why (for which) he refused our offer? 这就是他拒绝我们帮助他的理由吗?

　　5)that代替关系副词

　　that可以用于表示时间、地点、方式、理由的名词后取代when, where, why和"介词+ which"引导的定语从句，在口语中that常被省略，例如:

　　His father died the year (that / when / in which) he was born. 他父亲在他出生那年逝世了。

　　He is unlikely to find the place (that / where / in which) he lived forty years ago. 他不大可能找到他四十年前居住过的地方。

　　用关系代词，还是关系副词完全取决于从句中的谓语动词。及物动词后面无宾语，就必须要求用关系代词;而不及物动词则要求用关系副词。例如:

　　This is the mountain village where I stayed last year.

　　I'll never forget the days when I worked together with you.

　　判断改错(注:先显示题，再显示答案，横线;用不同的颜色表示出。)

　　(错) This is the mountain village where I visited last year.

　　(错) I will never forget the days when I spent in the countryside.

　　(对) This is the mountain village (which) I visited last year.

　　(对) I'll never forget the days (which) I spent in the countryside.

　　习惯上总把表地点或时间的名词与关系副词 where, when联系在一起。此两题错在关系词的误用上。