初中英语知识点总结—原因状语从句讲解_中考网

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  • 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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  • 2016-04-25