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原因状语从句是由“because, as, since, for”引导的,用来说明主句所表达的情况或事实的原因,其中because 和 since 主要用于正面原因,as 和 for 则主要用于负面原因。它与主句之间一般是逻辑上的因果关系。
一、because/since/as/for引导的原因状语从句
1、because/since/as/for + 从句
例句:
①Because the weather was bad, we didn't go out.
②Since he was ill, he didn't go to school.
③As the exam was approaching , she felt nervous.
④For the food was too expensive, few people bought it.
2、because/since/as/for + 主语 + 动词
例句:
①Because of the bad weather, we had to change our plan.
②Since he was ill, he had to stay at home.
③As the exam was coming, she was studying very hard.
④For the food was too expensive, no one bought it.
二、because/since/as/for 的区别
1、because 和 since 用来引导原因状语从句,表示“由于,因为”,意义相近,但是 because 引导的从句可以放在主句前,而 since 引导的从句要放在主句后。
2、as 和 for 用来引导原因状语从句,表示“由于,因为”的意义,主要用于表示负面的原因。但是 as 引导的从句可以放在主句前,而 for 引导的从句要放在主句后。
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