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you should try it on before you buy it同义句 you should try it

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you should try it on before you buy it同义句 you should try it on -------- --------- it
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You should try it on before you buy it.
= You should try it on (before buying) it.
后面变化中把before改做介词,其后加动名词buying.
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再问: before原来是副词对吗?
再答: before有三种词性:介词,副词和连词。 before you buy it中,before是连词,引导时间状语从句 before buying it中,before是介词。 before也可以做副词,如:I‘ve never been to Beijing before. 我以前从来没去过北京。 如果对你有所帮助,请点击本页面中的“选为满意回答”按钮,谢谢!