初中英语知识点总结:初中英语语法——引导状语从句的连词
2018-07-31 16:09
来源:互联网
作者:
(二)状语从句
修饰主句中的谓语动词,形容词或副词等的从句叫状语从句。
例如:
He didn't go to school yesterday because he was ill.(修饰动词go)
昨天他没去上学,因为他病了。
We must study so well as our teacher hoped.(修饰副词well)
我们应该学得你我们老师希望的那么好。
Lucy is younger than Jim(is)。(修饰形容词younger)
露茜比吉姆年轻。
状语从句的语序应是主语+谓语+其他成分,即陈述句的语序。
状语从句的位置,可以放在主句前面或后面,但是若放在主句前面,要用逗号与主句分开;主句若是疑问句,那么时间状语从句只能放在主句的前面。
1)时间状语从句
时间状语从句由when, while, after, before, since, as soon as, till, until等连词引导。
例如:
I went to bed after the TV play was ever.
电视剧完了以后我上床睡觉。
Could you look after her while we're away?
我们不在时你能照顾她吗?
She has taught in this school since she came to this city in 1989.
自从一九八九年她来到这座城市以来一直在这所学校教书。
Wait until I come back.
请你等到我回来。
注意:
如主句是一般将来时,则表示将来的时间状语只用一般现在时。
例如:
I'll write to you as soon as I get to Beijing.
我一到北京就将写信给你。
It will get warmer and warmer when spring comes.
春天来临时,天气将变得越来越暖和。
2)原因状语从句
原因状语从句由because, as, since等连词引导。
例如:
He sold the car because it was too small.
他卖掉那辆小汽车,因为它太小了。
Since you won't help me, I must do the job myself.
你既然不帮我忙,我必须自己做这项工作。
As my mother is away at this moment, I have to look after my younger sister.
由于我的妈妈现在不在,我不得不照顾我的妹妹。
注意:
a)because, as, since, for的用法辨析
because, as, since, for都是表示各种理由的连词,但because多表示所叙述的理由是本句的重点,故because所引导的从句常放在句末。
例如:
Why was he absent? Because he was badly ill.
他为什么缺度?因为他病得很重。
as, since用于表示理由是已知,而理由以外才是叙述的重点,两者皆多用于句首,但要注意since重形式,as多表示理由以外的才是重点。
例如:
As it is raining, let's stay as home.
因为下雨,我们就留在家里吧。
Since you have no license, you are not allowed to drive.
因为你没有驾驶执照,所以你不可以开车。
for不用于句首,而用于主句之后,补充说明理由;主句表推测时,用for说明原因。