on ,in,under,for, over, from, at, about, towards, with, without, below, by , of,after , before, across, past, …
介词后加名词，代词，动名词
介词有很多，on after before in with under 这些，后面动词跟动名词
For from这些都是
in. on. at. about. after. alone. among.
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