精选优质文档-倾情为你奉上 介词及介词短语 介词的功能介词是一种虚词,用来表示名词或相当于名词的其它词语句中其它词的关系,不能单独使用。介词可与名词或相当于名词的其它词构成介词短语。介词短语可在句中作定语,状语,表语和宾语补足语。例如:The boy over there is Johns brother. (定语)The girl will be back in two hours. (状语)Our English teacher is from Australia. (表语)Help yourself to some fish. (宾语补足语) 介词和种类(1) 简单介词,常用的有at, in, on, about, across, before, beside, for , to, without等。(2) 复合介词,如, along with, because of, in front of, instead of等。常用介词的用法一. at/ in /on .1.表示时间:1).表示某一具体时间点,某一时刻/