as: because: because of; since
as: because: because of; since; for的用法区别
as, because, because of, since 和for都有“因为、由于”的意思,它们的用法区别是:
1.as意为“因为、由于”,语气比 because弱,所引导的从句表示的是不言而喻、 为人所知的、显而易见的原因和理由,其从句一般放在主句前。如: As it was late, we came back soon.由于时间很晚了,我们很快就回来了。 As I am free today,, write to you..由于我今天有空,所以给你写信。
2.because意为“因为”,指直接原因,语气最强,常表示必然的因果关系,引 导的原因状语从句是全句意思的重心,它引导的从句一般放在主句的后面
回答以why引起的特殊疑问句,只能用 because.如
Tom didn' t go to school because he was ill汤姆没上学,因为他病了。
Why didn' t John go to the park?约翰为什么没去公园?
Because he had to look after his little sister.
因为他得照看他的小妹妹。
3. because o表示因果关系时,后不能接从句,但能接名词、代词或动名词,此 时它的词性不是连词,而是介词短语。
The football match was cancelled because of rain
由于下雨,足球赛被取消了。 He didn ' t go to Beijing because of that.由于那件事,他没有去北京。 Helen didn't attend the party because of her mother,'s coming. 由于她母亲来了,海伦没有参加聚会。
4. since意为“由于、既然”,所引导的从句表示的是已知事实的理由和一种间 接或附带的原因,语气比 because弱,但比as强,其从句一般位于主句之前
如:
Since it is raining, you'd better take an umbrella with you
既然在下雨,你最好带把雨伞
Since I have no money. I can I buy any food
山于我没钱,所以我不能买食物。
5.for是并列连词,用来附带解释或说明前一句的情况,有时它表示的理由是 推测性的,它所引导的分句只能放在另一分句之后。如
The day breaks. for the birds are singing
天亮了,因为鸟在叫。(表示推测)
He felt no fear. for he was brave e.他很勇敢,毫不畏惧。
【注意】 because, sInce不可与so连用。
请选用as: because: because of; since; for词语的适当形式填空:
1) he can‘t answer the question, you' d better ask someone else
3) The oil must be out, the light went out
4) I haven I seen the film, I can t tell you what I think of it
5) He was absent his sickness
Keys: 1)Since 2)Because 3)for 4)As 5) because ol
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