精选优质文档-倾情为你奉上2012届高考一轮复习语法专项十六:介词介词又叫前置词,是一种虚词。介词分为三种,一种是简单介词,如at, in, on, beside, to , for等;另一种是短语介词,即由两个以上的词组组成的短语,如in front of, because of, out of, instead of等;还有一种叫二重介词,如until after, from behind等。(一)介词的句法功能介词不能独立在句中做成份,介词后必须与名词、代词、或动名词构成介词短语在句中充当一个成份,表示人、物、事件等与其它人、物、事件等之间的关系。1、作定语:The book on the table is mine.2、作状语:We have breakfast at seven.(表时间);They were late for meeting because of the heavy rain.(表原因);They started the machine by pressing the button.(表方法)3、作表语:My dictio