因为；由于
先理解核心含义，再看它在真实句子里的用法。
因为；由于
because; since
I felt tired, for I had walked all day.
我感到疲倦，因为我走了一整天。
用法提示：“for”在此作连词，引出原因从句，相当于“因为”。
He was late for the meeting, for his car broke down.
他开会迟到了，因为他的车坏了。
用法提示：“for”作为连词，连接前后分句，表示原因。
We stayed indoors, for it was raining heavily.
我们待在室内，因为外面下着大雨。
用法提示：“for”引导原因状语从句，说明主句行为的理由。
连词 for 通常不用于句首，而是连接两个分句，表示原因，语气比 because 正式。
He was late, for he had missed the bus.
他迟到了，因为他错过了公交车。
for 引导的从句通常放在主句之后，表示对前面情况的补充解释。
She must be tired, for she worked all night.
她一定很累，因为她工作了一整夜。
grammar · medium
易错句子I stayed home for it was raining.
正确表达I stayed home because it was raining.
连词 for 表示原因时过于正式或古旧，通常用于书面语或诗歌。日常英语中应使用 because 引导原因状语从句。
grammar · medium
易错句子He failed for his laziness.
正确表达He failed because of his laziness.
连词 for 后接从句，不能直接跟名词短语。表示“因为”后接名词时，应使用介词短语 because of。
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