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初三上册英语期末知识点复习:连词

编辑:

2015-01-07

1) 当某事正在进行的时候,又发生了另一件事。While, when, as 都可用来引导表示"背景"的时间状语从句。例如:

As/When/While I was walking down the street I noticed a police car.

2) 当两个长动作同时进行的时候,最常用的是while。例如:

While mother was cooking lunch, I was doing my homework.

3) 当两个动作都表示发展变化的情况时,最常用的是as。例如:

As children get older, they become more and more interested in things around them.

4) 当两个短动作同时发生时,或表示"一边…一边…"时,最常用as。例如:

Just as he caught the fly, he gave a loud cry.

She looked behind from time to time as she went

5) 当从句的动作先于主句的动作时,通常用when。例如:

When he finished his work, he took a short rest.

6) 当从句是瞬间动作,主句是延续性动作时,通常用when。例如:

When John arrived I was cooking lunch.

(2)as, because, since , for

这四个词都可表原因,但用法有区别。

1) 如果原因构成句子的最主要部分,一般用because。因此,because引导的从句往往放在句末。例如:

I stayed at home because it rained.

---Why aren't you going?

---Because I don't want to.

2) 如果原因已被人们所知,或不如句子的其它部分重要,就用as或since。Since比as稍微正式一点。As和since 引导的从句一般放在句子的开头。例如:

As he wasn't ready, we left without him.

Since I have no money, I can't buy any food.

3) for用来补充说明一种理由,因此,for引导的从句几乎可以放在括号里。For引导的句子不放在句子的开头。例如:

I decided to stop and have lunch----for I was feeling quite hungry.

(3)if, whether

if和whether都可作"是否"讲,在引导宾与从句是一般可互换。例如:

I wonder whether (if) you still study in that school.

I don't know whether (if) he likes that film.

在下列情况下,只能用whether,不能用if:

1) 引导主语从句时。例如:

Whether he will come to the party is unknown.

2) 引导表语从句时。例如:

标签:英语知识点

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