3、原因状语从句 (2-1)

（三）原因状语从句知识点总结

　　是用来说明引起主句这个结果的原因的从句，在初中阶段引导原因状语从句的从属连词主要的有because, as, since, for等。例如：

　　1.I didn;t go to school yesterday because I was ill. 我昨天没去上学，因为我生病了。

　　2. Since everybody is here, let;s begin our meeting. 既然大家都来了， 让我们开始开会吧。

　　3. As you are in poor health, you should not stay up late. 既然你身体不好， 你就不该熬夜。

　　4.I asked her to stay to tea, for I had something to tell her. 我请她留下来喝茶，因为我有事要告诉她。

原因状语从句应注意的问题

　　1、because, since, as, for，辨析

　　1）because语势最强，用来说明人所不知的原因，回答why提出的问题。当原因是显而易见的或已为人们所知，就用as或 since.

　　I didn;t go, because I was afraid.

　　Since /As the weather is so bad, we have to delay our journey.

　　2）由because引导的从句如果放在句末，且前面有逗号，则可以用for来代替。但如果不是说明直接原因，而是多种情况加以推断，就只能用for.例：

　　He is absent today, becaus e / for he is ill. 　　He must be ill, for he is absent today.

　　3） as和for的区别：通常情况下，as引导的从句在主句前，for引导的从句在主句后。例:As the weather is cold, I stay at home.（同义句） I stay at home, for the weather is cold.

　　2、because习惯上不与so连用

　　汉语习惯上说“因为…所以…”，但英语习惯上却不能将 so与because 连用：

　　正：Because it was raining, we stayed at home. / It was raining, so we stayed at home.

　　误：Because it was raining, so we stayed at home. 因为下雨，所以我们呆在家里。

　　3、because 从句与 because of短语的转换

　　Because引导的原因状语从句有时可与because of 短语转换，because of后加的原因可以为好或坏 ，但最正规的还是because.

　　He can;t come because he is ill. / He can&;t come because of his illness. 他因病不能来。

初中重要短语及知识点总结提示您：看后求收藏（同人小说网http://tongren.me），接着再看更方便。