兴趣可以使人集中注意，如果要让学生感兴趣，教师就要饱含情感。精品学习网编辑了庆阳中考英语知识点：原因状语从句，欢迎阅读!

比较：because, since, as和for

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。

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

He must be ill, for he is absent today.

上面就是为大家准备的庆阳中考英语知识点：原因状语从句，希望同学们认真浏览，希望同学们在考试中取得优异成绩。