英语北师大版一轮复习讲练：Part II 语法部分专题9 状语从句_高考复习指南

　　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的，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。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。

　　He is absent today, because / for he is ill.

　　He must be ill, for he is absent today.

　　四、目的状语从句

　　表示目的状语的从句可以由 so that, in order that, lest, for fear that, in case等词引导。

　　You must speak louder so that / in order that you can be heard by all.

　　He wrote the name down for fear that(lest)he should forget it.

　　Better take more clothes in case the weather is cold.

　　五、结果状语从句

　　结果状语从句常由so...that 或 such...that引导。so...that与such...that之间可以转换。

　　The boy is so young that he can't go to school.

　　He is such a young boy that he can't go to school.

　　六、条件状语从句

　　连接词主要有 if, unless, as / so long as, on condition that等。

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