before何时是连词何时是介词
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before何时是连词何时是介词
before何时是连词何时是介词
before何时是连词何时是介词
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.
before后面接句子时,是连词
before后面接词或者短语时,是介词。
before 的后面接句子时,是连词;其后面接词或短语时,是介词。
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