求 before doing sth的用法?

来源：学生作业帮编辑：作业帮分类：综合作业时间：2024/05/15 11:10:38

求 before doing sth的用法?
He was sad before doing sth.
就是before doing sth 前可以不可以用过去时态.
不行的话,那应该如何表示去电影院前,我去了图书馆.是过去时态.

efore在这里只是个介词,所以后面需要跟动词的ing形式,与时态无关.因此,before doing sth.前是可以用过去时态的.
去电影院前,我去了图书馆可以如下翻译：
I went to the library before going to the cinema.

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