prepositional objective phrase 基本例句 介宾短语 From our points of view a prepositional phrase can act as a subject to some extent.我们认为介宾短语在一定条件下可以作主语。 A prepositional phrase is one linguistic element composed with one prepostion and other phrases.摘要介宾短语是由介词和其他词或短语组成的语言单位。