文档介绍：介词
重难点分析
介词又叫前置词，是一种虚词。不能单独作句子成分，必须与名词、代词、或动名词构成介词短语，在句中充当一个成分，表示人、物、事件等与其他人、物、事件等之间的关系。介词短语在句中可作定语、状语、表语、宾语补足语。
一、介词从结构上分类一览表
介词的分类
简单介词
只有单独一个词的介词：after, at, on, in, during, since, till/until等(时间介词)；across, over, through, past, near, to, above等(方位介词)；by, for, down, from, of, off, behind, below, beneath, beside, between, beyond, up, with, about, against, along, among, around等
复合
介词
由两个单一词合成的介词：into, inside, onto, outside, throughout, towards, upon, within, without等
短语
介词
形容词、分词或副词+介词：according to, away from, down to, inside of, near to, opposite to, owing to等
连词+介词：as for, as to, because of等
介词+介词（又称双重介词）：from among, from behind, from under, till after等
介词+名词+介词：by means of, in front of, in spite of, on account of, with regard to等
名词+介词：thanks to
由其他词类转用
分词
concerning 关于，considering 鉴于，including 包括，regarding 关于
形容词或副词
like 像，near 接近，opposite 在……对面，unlike 不像，round 围绕……，next 和……接邻
连词
than 比，but 除了……之外
名词
despite 不管、不顾
二、主要介词的区别
1. 表示时间的at, in, on
at表示片刻的时间。如：at 8 .。常用词组有：at dawn, at dusk, at noon, at night, at midnight, at the end of, at that time, at the moment, at Christmas, at New Year等。
in表示一段时间。如：in the morning/afternoon/evening, in October, in 2008, in the 21st century, in summer, in the past, in the future, in five days等。
on指具体的或特定的日子。如：on Monday, on Christmas Eve, on May Day, on a warm morning, on September 12th, on that day等。
2.