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初中英语知识点总结—原因状语从句讲解

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发表于 2016-6-28 22:14:28 | 显示全部楼层 |阅读模式
初中英语知识点总结—原因状语从句讲解
        原因状语从句
        连词有:because as since now that等
        (1) 区分because, as, since, for
        ① because表示人们不知道的直接的原因或理由,着重点在从句,其所引导的从句,为全句句意的中心所在。通常用于回答why引出的疑问句,语气最强,除特别强调外,该从句一般位于主句后面,不能与so连用但是可以与so进行同义句转换。
        I didn't go aboard with her because I couldn't afford it.
        我没有和她一起出国是因为费用太高。
        ② as引导的原因状语从句所传递的通常是已知信息,从句多位于主句之前,表示双方那个已知的理由,如:
        As I didn't know the way,I asked a policeman.
        我不认识路,因而问警察。
        ③ since引导的原因状语从句多表示大家众所周知的理由,如:
        Since traveling by air is much faster, they decided to take a plane.
        既然乘飞机旅行快得多,他们就决定坐飞机。
        ④ for表示的理由是附加的或推断的,并非此原因,通常与主句用逗号隔开,不位于句首,如:
        He must be not at home, for the telephone isn't answered.
        用because, as, since, for 填空:
        We'll have to go to bed early ___________ we'll start off early tomorrow.
        ___________ you know all about it, tell me please.
        ____________ all the seats were taken, I had to stand.
        He must be at work, __________ the light in his office is still on.
        Lily didn't go to school ___________ she was ill.
        =_________________________________________________________.
        (4) now that引导的原因状语从句
        Now that "因为;既然",通常可以和since换用。用来表示一种新的情况,再加以推论。如:
        Now(that) you have passed your test, you can drive on your own.
        你既已考试合格,就可以独自开车了。
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