past是介词还是形容词？

既是介词又是形容词
如：The days are past / in the past few years(形容词）
He walked past the school/ he is past 40(介词）
此外，还做名词
He speaks little about his past

past

n.
过去, 往时
adj.
过去的, 结束的
prep.
越过, 晚于

名词 形容词 介词 都可以

past- it is not an adjective/noun or verb

same tense with words like on by through

形容词,查一下字典就知道了

要看怎么用了