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新概念英语3、4册连读 巩固+提升 
1. 原因状语从句表原因或理由，其关联词有：
because,as,since,now (that)等。because,as引导的从句可位于句首,也可位于主句之后；since和now (that)引导的从句一般位于句首。
Because I was ill, I didn't go to school yesterday.因为我病了,所以昨天没有去上学。
I study because I want to learn.我学习是因为我想学到知识。
As the wages were low,there were few applicants for the job.因为工资低,没有什么人申请这份工作。
I can't come tonight,as I'm going to a concert.今晚我不能来,因为我要去听音乐会。
Since we've no money, we can't buy it.由于我们没有钱,我们不能买它。
Now (that) John's arrived,we can begin.既然约翰来了,我们就可以开始了。
2. 下面几种情况只用because：回答why提出的问题；用来引导表语从句；用在强调原因状语从句的强调句之中；当从属连词前有only,just,simply修饰时。
Why is he absent? Because he is ill. 他为什么旷课？因为他病了。
He did not speak to you, it was because he didn't recognize you.他没有跟你讲话是因为他没有认出你。
You shouldn't get angry just because some people speak ill of you.你不应该因为有人说你的坏话就大发脾气。
3. 注意for虽常译为“因为”,但它是并列连词,不是用来说明原因,而只是一种附带的、补充的解释或说明。
We must start early,for we have a long way to go.我们必须早点出发,因为我们有很长的路要走。
Something fell in,for I heard a splash.有东西掉进去了,因为我听见扑通一声。 | 
