指一个分句在主句中做形容词所做的成分（修饰名词）。

简单来说，我们只需要把整个形容词性从句打个包，整个从句当成一个形容词就行了。

比如：

你昨天错过的那场会议非常重要。The meeting that/which you missed yesterdaywas

very important.（整个从句当成一个形容词修饰名词meeting）那个正在说话的小男孩儿是我儿子。The boy who is speaking is my son. (整个从句当成一个形容词修饰名词boy)那正是我感兴趣的话题。That’s just the topic that/which I’m interested in.(整个从句当成一个形容词修饰名词topic)四川是我出生的地方。Sichuan is the place where I was born.(整个从句当成一个形容词修饰名词place)他出生那年父亲去世了。His father died the year when he was born.（整个从句当成一个形容词修饰year）

掌握形容词性从句，需要先理解两个基本概念：先行词和关系词

—先行词：被定语从句修饰的名词（代词）

前面三个例句中，meeting，boy, topic 就分别是各自从句的先行词。

【 注】：在学习定语从句的时候，我们需要特别注意中英文在定语位置上的巨大差异。

英文与中文在修饰语位置摆放上有明显区别。中文名词的修饰语，无论长短，均在名词之前，而英文则习惯修饰语放在名词之后。如果是单个形容词，放在名词之前。短语，从句修饰名词时都放在名词之后。这就是所谓的英语定语后置概念。通过前面的例句我们可以明显看出，定语从句一定是放在meeting，boy，topic这些先行词之后的。

—关系词 ： 引导形容词性从句（定语从句）的词叫关系词。

前面三个例句中，that,which,who就是关系词。它们不仅仅引导形容词性从句，还在从句中作主语或宾语。

关系词分为【关系代词】和【关系副词】

–关系代词：该关系词在从句中做主语或者宾语，还是前面两个例句：

The boy who is speaking is my son.句中，who引导一个定语从句（主语who；谓语is speaking；）

The

meeting that/which you missed yesterday was very important句中，that引导定语从句。（主语you；谓语missed；宾语that/which）

常见的关系代词有

1）指人的：who，whom2）指物的：which3）既指人又指物的：that，whose，as, but

注：1) as用作关系代词，引出定语从句。

such…as像…这（那）样的，像…之类的；such用作定语。As本身在从句里作主语，定语和表语。Britain is not enjoying such prosperity as it was in the mid-1980s.We will give you such data as will help you in your work.I hope to get such a tool as he repaired this instrument with.

the same…as和……同样的 This is the same tool as I used yesterday. He is not the same man as he was.

2）… same as 有时发展到接近于 Just as 引出的方式状语从句的用法。

例如， she has put her energy into literature– same as you have put yours into computers.

–as many…as; as much…as 如……一般多，如此之多。

–he has as many books on information technology as I have.

3）关系代词as代替整个主句，并在从句中作主语、宾语、表语。引出非限制性定语从句。

–the size of the

audience, as we had expected, was well over one thousand. If he comes late, as is usual, for another time, we’ll not receive him.

【 常见的从句有】

As has been said beforeAs many be imaginedAs is well knownAs we all can seeAs often happensAs will be shown in …As has been explained in the preceding paragraph.As has been already pointed out

2.–关系副词：该关系词在从句中做状语

一般来讲，关系副词有三个–when，where，why。

一方面它们分别引导形容词性的从句，修饰前面的名词；另一方面，它们又各自在从句里面做状语，表示时间、地点和原因。

比如：

The teacher wanted to know the reason why he was always late.It’s 5 o’clock when all people in the town are sleeping. He came to the town where he grew up.

【今天知识总结】

1. 我们只需要把整个形容词性从句打个包，整个从句当成一个形容词就行了。

2. 关系代词和关系副词

我是老何，一个钻研英语12年的英语狗。

今天就到这里，感谢阅读，我们下期见！