介词一、 介词的定义和分类1、定义：介词是一种虚词。不能在句子中担当成分，需要和名词、代词等构成介词短语，才能担当句子成分。2、分类时间介词：in at on before after方位介词：in，on，at，over，above，below，under，behind动词介词：to，at，on，over，below，under，behind动向介绍：by，on，with原因介词：of for练习：1，We went to the country( ) a very cold morning.A. at B. in C. on D. of2,China lies( )the east of Asia and( )the north of Australia.A. to; to B. in; to C. to; in D. in; on3, I didnt go to the park with my classmates,
