在语法上,短语是介于词和句子之间的中间层次。人们普遍认为短语是按一定的语法规则围绕一个中心词(head-word)结合起来的。中心词的词性决定着短语的名称、性质、功能及其结合的方式。但是,语法学家们对英语介词短语的结构始终未取得一致意见。有些语法学家认为:在介词短语中,介词 Grammatically, phrases are intermediate levels of words and sentences. It is generally accepted that phrases are grouped around a head-word based on certain grammatical rules. The part-of-speech of the central word determines the name, nature, function and combination of the phrase. However, grammatists have always found no consensus on the structure of English prepositional phrases. Some grammarians think: Prepositional phrases, prepositions