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人们常说:“英语是介词的语言”。介词虽然是一种虚词,但它是英语中最常用的词类,由它组成的短语,可使语言简炼、明了、生动,介词在英语中起着极其重要的作用。如:They would never have done it if youhadn’t helped them．就可用介词短语改写成:They would never have done it withoutyourhelp．没有你们的帮助,他们绝对办不成那事。下面就介词短语的构成及其在句中的作用作些归纳。一、介词短语的构成介词和它后面的词、词组或句子,构成一个短语,称为介词短语。介词短语的构成有下列十种形式:1．介词+名词。如:He put the money in his pocket．他把钱放在口袋里。They fought with courage．他们英勇地战斗。He stood beside the table．他站在桌边。2．介词+代词。如:Leave your dog with me．把你的狗交给我吧。He did it all by himself．他独自一人做了这件事。I wrote a letter to him．我写了一封信给他。3．介词+动名词。如:
People often say: “English is the language of prepositions.” Although preposition is a kind of function word, it is the most commonly used word class in English. The phrase formed by it can make the language concise, clear and vivid. Prepositions play an extremely important role in English. Such as: They would never have done it if youhadn’t helped them. It can be rewritten as a prepositional phrase: They would never have done it without withoutourhelp. Without your help, they absolutely cannot do that. The composition of prepositional phrases and their role in the sentences are summarized below. The prepositional preposition of a prepositional phrase and the word, phrase or sentence behind it constitute a phrase, which is called a prepositional phrase. The composition of prepositional phrases has the following ten forms: 1. Preposition + noun. Such as: He put the money in his pocket. He put his money in his pocket. They fought with courage. They fight bravely. He molded beside the table. He stands at the table. 2. Preposition + pronoun. Such as: Leave your dog with me. Give your dog to me. He did it all by himself. He did it alone. I wrote a letter to him. I wrote a letter to him. 3. Preposition + gerund. Such as: