原因状语从句

原因状语从句

引导原因状语从句的从属连词

  主要的有because, as, since,seeing (that), now (that), considering (that),in that等:

  The woolly shrank because it was washed badly. 毛衣因为洗涤的方法不好而缩水。

  I can’t get to sleep because of the noise outside. 由于外面声音嘈杂我睡不着。

  Since [As] we’ve no money, we can’t buy it. 由于我们没钱,我们不能购买它。

  Seeing that it’s raining, we’d better stay indoors. 既然外边在下雨,我们最好待在室内。

  Now that you are here, you’d better stay. 你既然来了,最好还是留下吧(既来之,则安之)。

  【注】除以上提到的大家比较熟悉的引导原因状语从句的从属连词外,when有时也可引导原因状语从句(when表示“既然”)

  I won’t tell you when you won’t listen. 既然你不想听,那我就不告诉你了。

引导原因状语从句的用法

  原因状语从句表原因, 以下逐一介绍中考、高考中常见的原因状语从句的引导词:

  1. because引导的原因状语从句一般放于主句的后面,because从句位于句首时要用逗号分开,放在句末 时,可不用逗号分开。because表示直接原因, 语气最强, 最适合回答why引导的疑问句。

  例如:

  I do it because I like it.

  我做这件事是因为我喜欢。

  You can trust those products because the quality never varies.

  你可以信赖那些产品,因为它们的质量从来不变。

  We went by bus because it was cheaper.

  我们乘公交汽车去,因为这样便宜一些。

  注意: “not ... because”结构中的not否定的是because引导的整个从句,

  例如:

  The country is not strong because it is large.

  国强不在大。

  I didn't help him,not because I was unwilling,but because I was unable to do it.

  我没有帮助他,不是因为我不愿意,而是因为我力不从心。

  2. since引导的原因状语从句一般放于主句之前表示已知的、 显然的理由(通常被翻译成“既然”), 较为正式, 语气比because弱。

  例如:

  Since you are free today, you had better help me with my mathematics.

  既然今天你休息, 你最好帮我补习数学。

  Since you don't trust him,you should not employ him.

  你既然不信任他,你就不该雇用他。

  注意: seeing (that), now (that), considering (that), in that这几个词汇与since引导的原因状语从句意思相近, 都表示“既然”。

  例如:

  Seeing (that) he refused to help us, there’s no reason that we should now help him.

  他既然曾经拒绝帮助我们, 我们没有理由要来帮助他。

  Now (that) you are grown up, you should not rely on your parents.

  既然你长大了, 就不应该依靠你的父母了。

  Considering (that) everybody is here, let’s begin our discussion.

  既然大家都到了, 我们就开始讨论吧。

  In that he is ill, he feels unable to do it.

  因为他生病了,他觉得做不了那件事。

  3. as 引导原因状语从句时表示附带说明的“双方已知的原因”, 语气比since弱, 较为正式, 位置较为灵活(常放于主句之前)。

  例如:

  As it is raining, you’d better take a taxi.

  既然在下雨, 你最好乘出租汽车。

  As you are tired, you had better rest.

  既然累了, 你最好休息一下。

  I went to bed early, as I was exhausted.

  我睡得早, 因为我已筋疲力尽了。

  4. for引导的是并列句表示原因但并不说明主句行为发生的直接原因, 只提供一些辅助性的补充说明, for引导的并列句只能放于主句之后并且必须用逗号将其与主句隔开。

  例如:

  He could not have seen me, for I was not there.

  他不可能见过我, 因为我不在那里。

  He seldom goes out now,for he is very old.

  他难得出门了,因为他年事已高。

  注意:

  ①in view of the fact that可用as/since/seeing that来表示,但不能用because:

  As/Since/Seeing that you are gere,you may as well give me a hand.

  既然你在这里,你就帮我个忙吧。

  As/Since/Seeing that Tom knows French,he'd better do the talking.

  既然汤姆懂法语,最好让他来谈。

  ②在as/since/seeing that意指以前共知的或共知的陈述时,可用if来代替:

  As/Since/Seeing/If you don't like Bill。why did you invite him?

  既然/如果你不喜欢比尔,你为什么邀请了他?

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