before doing sth 和 before you do sth,为什么?
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before doing sth 和 before you do sth,为什么?
都对
前者是介词; 后者是从属连词,引导时间状语从句
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都对
第一种用法中before 是介词,后面要用动词的ing形式
第二周用法中before是连词,后面加的是句子
你可以再详细查查before的词性
对
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