摘要：2．for 表示的是推断解释.because强调动作发生的直接原因. It must have rained last night, for the ground is wet. 昨晚肯定下雨了.因为地面是湿的.(不可用because.因为地面湿不是天下雨的原因) The day breaks, for the birds are singing. 天亮了.因为鸟在叫.(不可用because.因为鸟叫不是天亮的原因) He went to bed early, because he was tired 由于他累了.所以他很早就上了床. He must be tired, for he went to bed early. 他肯定累了.因为他很早就上了床.

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