来源：学生作业帮 编辑：大师作文网作业帮 分类：英语作业 时间：2024/09/20 18:36:56
before属于什么时态
要全部说出来
可用于一般现在时,一般过去时,现在进行时,过去进行时,现在完成时或过去完成时等,如
I have never been there before.
He had worked for ten years before he joined the army .
He sits before me .
He stood before me yesterday .
He is standing before me now.
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