The third and most fundamental feature of Old English is its grammar.

古英语第三个也是最基本的特征是它的语法。

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Middle English, then, was still a Germanic language, but it differed from Old English in many ways. The sound system and the grammar changed a good deal.

尽管受到法语的影响，中世纪英语仍然是一门日耳曼语，但是与古英语有许多区别：语音系统和语法系统有了很大的变化。

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This paper presents a discussion on the psycholinguistic cause of the structural transformation of the grammar of Old English.

本文旨在讨论古英语结构转型的语言心理原因。在这个结构转型中，英语语法由综合形态转化为分析形态。

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