怀仁七中九年级英语第二轮专题复习学案

                         连词

1、        从属连词的用法

表示关系

作用

示   例

引导宾语状语从句

连

接

复

合

句

That ,if/whether

引导时间状语从句

when,while,as,since,before,after,as soon as,until/till

引导条件状语从句

if ,unless

引导原因状语从句

because , since , as

引导让步状语从句

Though,although,even if, howeven

引导结果状语从句

So…that…;such…that

引导比较状语从句

as…as…,than…,more…than

引导目的状语从句

(so)that , in order that

2、        并列连词的用法

表示关系

作用

例       词

并列关系

连

接

作

用

and,both…and…,neither…nor…as well as ,not only…but also…

转折关系

but, while ,only, or

选择关系

or,    either…or…

因果关系

for, then, so

3、        相似连词辨析

序号

相似连词

辨    析

例    句

1

if/whether

作“是否”讲，引导宾语从句，常互换

Do you know if/whether our teacher will come to the party?

在介词之后，动词不定式之前或or在之前，只用whether

I can’t decide whether to go or not.

if还作“如果”讲，引导条件状语从句

If Joan comes,I’ll tell you as soon as possible.

2

so…that

so为副词，修饰形容词或副词

“so+形容词”后也可跟单数可数名词

如果名词前有形容词many,much,few,little等修饰,用so

I'm so tired that I can’t walk any farther.

He is so tall a boy that he is good at basketball.

There are so many people in the room that it is very noisy.

such…that

such为形容词，修饰名词

It was such a warm day that we all went swimming.

3

when/while/as

三者作“当时”讲，引导时间状语从句，表示一段时间时可以互换（从句动词用延续性动词）

When/While/As we was looking for her watch,she just stood there.

表示一点时间时，when和as可互换（从句动词为终止性动词）

Dad was having supper when/as I got home.

如果when在意义上与before或after相当，则不用while,as

The film had begun when we arrived.