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前面有人提问关于 in five minutes 的介词问题（https://www.cpsenglish.com/question/48877），我也对此一直有的疑问：
是否在任何状况下，in five minutes 都表示“在五分钟之后”呢？这可能与动词性质有关吗？与时态有关吗？譬如下面的句子：
You must finish the work infive minutes.
He finished the work in fiveminutes.
通常来讲In+时间用在表示以后时（包含过去以后）才等于at the end of the time的意思 ( 大概是“朗文语法”讲解的）你上面的两个问题句通常都是指5分钟内。假如特意强调，也可以用within. 请看一个训练上写的句子，就当例句吧：You should complete the grammar / vocabulary test in10 minutes. 一般都会理解为10分钟内，就是不可以超越10分钟，你提前完成没关系。
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