because,since,for,as的区别.（分别举一个例子）

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because,since,for,as的区别.（分别举一个例子）
because,since,for,as的区别.（分别举一个例子）

because,since,for,as的区别.（分别举一个例子）
for ,because,as,since这四个词作为连词,都有"因为"的意思,但它们在用法上有区别：
because 是从属连词,接表示直接原因的从句,一般放在主句的后面,也可放在主句前面,它表示的语气最强,在回答why的问句时,必须用because.
例如：The swimming pool won't be open today because they're making repairs.
游泳池今天不开放,因为他们在修理.
Why did you move to France?
你们为什么搬到法国?
Because my father found work in Paris.
因为我父亲在巴黎找到了工作.
注意：在英语中用了because后,不可再用so.
as 是从属连词,说明一般的因果关系,语气比because弱,说明比较明显的原因,它引导的从句通常放在句首,有时也可放在句末.
例如：As it is raining,you\'d better take a taxi.
天下雨了,你最好乘出租车.
since 意为"既然",表示对方已知的无需加以说明的原因或事实,语气比because弱,但是比as 强.
例如：Since we have no money,we can't buy that vase.
既然我们没钱,我们就不能买那花瓶.
Since everybody is here,let's begin our party.
既然大家都到了,那就开始我们的聚会吧!
for 是并列连词,用来附带解释说明前一分句的原因或理由,for引导的并列句,一般放在所要说明的句子的后面.
例如：I went to see him,for I had something to tell him.
我去见他,因为我有事要告诉他.

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1 because(因为）：表示直接的原因或理由，着重点在从句，用于回答why，语气最强。
eg.
He didn't go to school because he was ill.
Why didn't he go to school? Because he was ill.
2 since(既然）：一般表示对方已知的，无须加以说明的即成事实的理由，全句中心在主句，语气比
because弱。
Since you are ill, I'll go alone.
3 as(由于）：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。
As it is snowing, we shall not go to the park.
4 for(因为，其理由是）：是个并列连词，只能放在另一个并列句后面，表示推理或解释，或用作附加说明，表示新的情况，而不是指理由或原因，语气最弱，一般不放在句首。
The day breaks, for the birds are singing.
* for表示因果关系时，可以同because交替使用，但for前须用逗号，而because则不必。
You couldn't have seen him because he wasn't there.
= You couldn't have seen him, for he wasn't there.

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