表选择关系的连词

表选择关系的连词

原因关系

  1)for 因为

  判断改错:

  (错) For he is ill,he is absent today.

  (对) He is absent today,for he is ill.

  for是并列连词,不能置于含两个并列分句的句子的句首,只能将其放在两个分句中间。

  2)so,therefore 因此,所以

  He hurt his leg,so he couldn't play in the game.

  3)because 因为

  I cannot sleep because I am too excited.

  注意:

  这两个词的意思很相近,通常是可以互换使用的。为了安全起见,最好用because引导从句,因为同 because引导的从句相比,for引导的从句的用法要受到某些限制:

  ①for引导的从句不能位于它所解释的动词之前:

  Because it was wet he took a taxi.

  因为下雨,他叫了一辆出租车。(这里不能用for)

  ②for引导的从句不能位于not,but或任何连词之后

  ③for引导的从句不能用于回答问题:

  —Why did you do it? 你为什么这么做?

  —I did it because I was angry. 因为我生气才这么做的。(这里不能用for)

  ④for引导的从句不能单单用来复述已讲过的话,而必须包括新的内容:

  He spoke in French. 他讲法语。

  She was angry because he had spoken in French. 因为他讲法语,她生气了。

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