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原因状语从句★★★★
1. 由as／because／since 引导的原因状语从句：
As 引导的从句比because弱，比较口语化，它引导的从句一般置于句首。Because引导的从句表示原因的语气较强，它引导的从句对已明确的事实表示稍加分析后的原因，它引导的从句一般置于句末，也可置于句首。Since(既然…)引导的从句一般置于句首，常用在书面语中，表示对方已知或稍加分析便知的原因。Now that 和since意义接近，表示既然，鉴于某个事实。
Since Albert
is late let’s begin without him.
As a steel
ship is hollow it floats on water.
The book is
interesting because it has many stories of adventure.
We camped
there as／because／since it was too dark to go on．
我们在那里露宿是因为天太黑，不能再继续往前走了。
As／Because／Since it was too
dark to go on，we camped there．
因为天太黑不能再继续往前走，我们就在那儿露宿了。
在下面几种情况下只用because:
1.回答why提出的问题；
2. 用来引导表语从句。
3.用在强调原因状语从句的强调句之中；
4. 当从属连词前有only justsimply修饰时。
1. Why is he
absent?---Because he is ill.
2. Why he
didn’t come to your party was because his father was badly ill.
3. It was
because he didn’t recognize you he did not speak to you.他不跟你说话，是因为他没有认出你。
4. 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。
2. 由连词for引导的句子语法上不叫原因状语从句，而叫做补充说明原因的并列分句。它不是一个从属连词而是一个并列连词，for引导的分句不能放在表结果的分句前。For前一般是逗号，但若前一句太长时，for前也可用逗号。 表示逻辑上的理由，提供一些有助于说明情况的补充说明，或表示一种推理，一般只用for引导。（所以它引导的分句一般不放在句首。）
There must
be no one in the house for the door is closed.房子里一定没有人，因为门是锁着的。
Someone must
have left the tap on for the water was running over and flooding the bathroom.一定是谁让水龙头开着就走了，因为水淹了浴室还流了出来。
3. in view
of the fact that可用as／since／seeing that来表示，但不能用because：
As／Since／Seeing that you are
here，you may as well
give me a hand．
既然你在这儿，你就帮我个忙吧。
As／Since／Seeing that Tom
knows French，he’d better do the
talking．
既然汤姆懂法语，最好让他来谈。
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