介词短语就是一个介词加上它的宾语。例如:at home (at介词+ home 名词作宾语),except you and me (except介词+ you and me代词作宾语), of building a house ( of 介词+building a house 动名词短语作宾语),by then (by介词+ then副词作宾语),in short (in介词 + short 形容词作宾语),from beyond the sea ( from介词 + beyond the sea介词短语作宾语)介词短语在句中可用作主语、宾语、表语、补语、定语、状语或者同位语,例如:From eight to ten is my busiest time of a day.8点到10点是我一天中最忙的时候。(主语)Is he at home? 他在家吗?(作表语)He is a man with one leg. 他是个独腿人。 (作定语)Make yourself at home.不要客气。(作补语)Have you been to the city of Shanghai? 你去过上海城吗?(作同位语)