古今语法的差异之一,是古代词的使用具有较大的灵活性,原属于甲类的词,在特定的语言环境中,可以临时用作乙类词,这就是我们平时所说的词类活用,而现代词归属某一词类比较固定,其语法功能也较稳定,一般情况下,不能任意活用(兼类词除外)。但是成语中却大量地保留了古代汉语中最值得注意的词类活用现象,如使动用法、意动用法,名词用如动词以及名词用作状语等。一、使动用法 One of the differences between ancient and modern grammar is the use of ancient words with greater flexibility, the original belongs to a class of words, in a particular language environment, can be temporarily used as a class B word, which is what we usually say the use of parts of speech , While the modern word belongs to a certain part of the class is relatively fixed, and its grammatical function is relatively stable, under normal circumstances, can not be free to use (with the exception of category words). However, idioms have largely retained the most noteworthy part of the use of Chinese in ancient Chinese, such as usage, intentional usage, nouns such as verbs and nouns as adverbs. First, the use of law