题目
before何时是连词何时是介词
提问时间：2020-10-09
答案
before既可以做介词,又可以做连词,意思是"在^之前".后面接句子时,是连词,如：
I had taught in that school before I moved here.
before后面接单词或者短语时,是介词.如：
He came here before 12 o'clock.
I had taught in that school before I moved here.
before后面接单词或者短语时,是介词.如：
He came here before 12 o'clock.
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