精选优质文档-倾情为你奉上一、介词按其构成可分为：1. 简单介词 at, in, on, to, since, until等。如：Hes worked there since 1998.2. 复合介词 into, onto, out of等。如：She is out of school. 她毕业了。3. 二重介词 from under, from behind, from out of, until after, except in等。如：Im from out of town. 我是从城外来的。4. 短语介词 because of, instead of, in spite of等。如：I went back not because of the rain, but because I was tired.我回去不是因为下雨，而是因为我累了。二、介词的作用：1. 表示地点： after, along, at, below, by, of, near, over, through, unde
