as与which引导的定语从句及定语从句关系代词和关系副词的区别教案

as与which引导的定语从句及

定语从句关系代词和关系副词的区别

适用学科英语适用年级高三适用区域适用版本区域课时时长（分钟）60分钟知识点 1.as与which引导的定语从句

2.只能用which引导的定语从句

3.定语从句与状语从句的区别

4.定语从句的强调句型

教学目标知识：1、掌握定语从句中非限制性定语从句的使用。

2、能准确使用关系词解答定语从句的相关问题。

方法：要总结、熟记一些关系词在定语从句中的使用；要学会在实际中灵

活运用。

能力：1、能正确运用关系代词和关系副词在各类定语从句中。

2、掌握并会分析句子成分，从而熟练解题。

教学重点 1.继续探讨关系词在非限制性定语从句中的应用

2.通过对相似句型的比较及句子成分的分析，在一些特殊情况下，关系

代词和关系副词如何进行选择

教学难点as 引导的非限制性定语从句；定语从句中需要注意的特例。

教学过程

一、复习预习

1.关系代词的种类：

关系代词: that, which, who, whose,

关系副词: when, where, why

2. He talked about the schoosl and the teachers _______he had visited .

A. that

B. which

C.who

D. whom

3. He talked about the schoosl and the teachers _______he had visited .

A. that

B. which

C.who

D. whom

4.Thelost their way in the forest ,_______made matters worse .

A. that

B. which

C.where

D. when

5. This is the house where he has lived for 20 years .

6. This is the house that he has lived in for 20 years .

二、知识讲解

知识点1：非限制性定语从句

1.关系代词在非限定性定语从句中的用法。

指人做主语用who,作宾语用whom ，指地点用where，指时间when，指物只用

which，不能用that，作定语用whose。

不用that)

e.g. He didn’t see the film, which was very interesting .(

2.as 引导的非限制性定语从句

as 可以像which一样引导非限制性定语从句，用来代表整个句子的内容，它的先行词可以

是名词，也可以是不定式短语或整个句子。as 在从句中作主语、宾语和表语。此外，有些

as 引导的定语从句已成为固定用法，如：

As we know As has been said before 如上所述

As is known to all As is often the case 像通常那样

As is reported As was expected 正如预料的那样

Eg：She is very careful, as her work shows.

As we know, smoking is harmful to one’s health.

As is often the case, we have worked out the production plan.

3.重点比较as 和which 引导的非限制性定语从句的联系和区别

?as 和which 都可以代替整个句子，当定语从句置于主句之后时，as和which可以和互换。

Eg：He didn’t tell me any news, as/which upset me.

?Which引导的从句，代表的前面的整个主句时，不能放在主句之前。而as 引导的定语从句，代表整个主句时，可以放在主句之前或之后，有时也可以放在主语和谓语之间。

Eg：As is reported in the newspapers, talks between the two countries are making progress.

= Talks between the two countries, as is reported in the newspapers, are making progress.

4.as与that的区别

As 引导的定语从句表示它的内容与主句所讲的内容相似，即指同类事物；that 引导定语从句表示的内容与主句相同，即为同一事物。

e.g. This is the same pen that I lost yesterday .这正是我昨天丢的钢笔。

This is the same pen as I lost yesterday .这正像我昨天丢的钢笔。

5. such ….as 和the same…as 的用法

：像…．一样的，像…..之类；

such ….as

the same…as

：和…..同样的

在这两个句型中，as是关系代词，such和same 作定语，修饰主语里的某个名词（或代词），这个名词是由as引导的定语从句的先行词，as在从句中可担任主语、宾语或表语。