第四章对比研究英美两种变体之间语法上的异同点，共分七部分，分别从动词，名词，冠词，代词，介词以及形容词和副词等方面来展现英美之间的语法差异。

The fourth chapter is the comparative research that is divided into seven parts discussing the difference in verbs, nouns, articles, pronouns, prepositions, adjectives and adverbs and other usages.

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