精选优质文档-倾情为你奉上介词学习与练习一、概述介词是一种结构词,不能单独担任句子成分。介词的作用是表示它后面的宾语同句中其他词语之间的关系。介词与它的宾语构成介词短语可以充当多种句子成分。如:The cost of food is rising.(定语)She was ill during the meeting. (状语)I found him in very good shape.(宾语补足语)通常介词可分为四类:简单介词:at, in, from, on复合介词:upon, inside, outside双重介词:from behind, from among短语介词:in case of, according to二、介词的意义1表示时间的介词in表示“在某一时间段”,或“在某一时候”,如用在月、季、年份、时代、世纪等时间名词的前面,或用来泛指一天的某一段时间。In July/summer/2000/ancient times/the 1999sIn the morning/afternoon/evening