词类是根据词的语法意义和语法功能而划分的词的类别。古代汉语的词类划分与现代汉语基本上是一致的，各类词的语法意义和语法功能古今汉语也基本上是一致的，而且是相对固定的。 但在古代汉语中，某些词在特定的语言环境中可以灵活运用，临时改变其基本功能，在句中充当其它类 Word classes are categories of words divided according to their grammatical and grammatical functions. The classification of ancient Chinese is basically the same as that of modern Chinese. The grammatical meaning and grammatical functions of ancient Chinese are basically the same, but also relatively fixed. However, in ancient Chinese, certain words can be used flexibly in specific linguistic environments, temporarily changing their basic functions and acting as other classes in the sentence