英语从句连词as soon as , because, before, if, so, so that, until, when, while的用法与区别

发布网友发布时间：2022-04-20 23:19

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热心网友时间：2023-10-25 03:49

时间状语从句(1)常用的连词有when, while, before, after, until(till),since, as soon as等。
(2)时间状语从句中一般不用将来时，若谈论将来的事情，往往用一般现在时代替，
如：I’ll go on with the work when I come back tomorrow./As soon as he finishes
the work, he will come to see me.
(3)when和while都表示“当……的时候”，但有区别。
when强调“特定时间”，如：
There was a loud knock at the door when he was just falling asleep.
while表示的时间是一段，而不是一点，如：
While he was having supper, he heard someone knock at the door.
while有时还有对比的含义，如：
While I was reading, he was writing.
2.原因状语从句(1)常由because, since, as引导。
(2)because表示直接的原因，着重点在从句，用于回答why,语气最强。
I can’t go to school because I am ill.
since一般表示对方已知的，无须加以说明的既成事实的理由，全句中心在主句，语气比because弱，常译为“既然”，如：Since you are ill, I’ll go alone.
as表示十分明显的原因，一般说明因果关系，着重点在主句，语气较弱。常译为“由于”，如：As it is raining hard, we won’t go hiking.�
for是个并列连词，只能放在另一个并列分句后面，表示一种推理或解释，或用作附加说明，而不是指理由或原因，语气最弱，一般不放在句首，常译成“因为”，如：You haven’t met him, for he didn’t come here.
3.条件状语从句
常由if(假如、如果)No matter(不管)来引导，如：No matter what he says，I won’t believe him，如果主句是一般将来时，从句往往用一般现在时来表示将来，如：I’ll go for a picnic if it is fine.
4.结果状语从句
一般由so...that, such...that引导，如：It’s such a heavy box that nobody can move it.
The box is so heavy that nobody can move it.