mary was so tired that she fell asleep over her book 为什么用over

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mary was so tired that she fell asleep over her book 为什么用over

mary was so tired that she fell asleep over her book 为什么用over
mary was so tired that she fell asleep over her book 为什么用over

mary was so tired that she fell asleep over her book 为什么用over
用over,和用on不同
这表明,他虽然在书上睡着了,但是,不是拔在书上,而是和书有距离,在书的上方
具体是个什么睡姿,可以想象成书在他的膝盖上

表示方位的介词,意为趴在书上。

这就是固定用法 一般说什么东西在桌子上用on 有生命的在树上用in 这个就表示趴在树上 你就记住就行 这也不好解释 就规定已习惯就这么用