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有些介词本身同时也是副词，它们叫介词副词，其中多数是用于表述地点或位置的副词，有些是用于表述时间的副词。常见的有：
about, above, across, after, along, around, before, behind, below, between,
beyond, by, down, in, inside, near, on, opposite, outside, over, past, round,
since, through, throughout, under, up, within, without.
什么情形下是介词、什么情形下是介词副词，很容易鉴别。比如：
A) He stayed in the house.
B) He stayed in.
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