1.because “因为”,是连词。表示直接而明确的原因和理由,语气最强。because引导的从句一般不放在句子的开头。例如:
He didn’t come because he was ill.
注: 对于以why开头的问句,一般只能用because引导的从句来回答。
2. as用来表示原因时,只说明一般的因果关系,语气没有because重,它所引导的从句,可放在主句之前,也可放在主句之后。例如:
You needn’t go with me, as you are busy.
As I was afraid, I hid myself.
3.for表示所说的理由是一种补充说明,因此,for引导的从句可以放在括号里,而且for引导的从句一般不放在句子的开头。例如:
I decided to stop and have lunch, for I was feeling quite hungry.
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