unit 2 english around the world 单元概述
本单元主要围绕english around the world这一主题介绍了英语的使用情况、发展情况及各地不同的方言。
第二单元english around the world的设计可分为五部分。第一部分warming up；第二部分learn something about the road to modern english；第三部分learn something about words and expressions；第四部分the structure which expresses commands and requests；第五部分using language。
第一部分通过比较英美两种英语中存在的差异及猜测同义异形单词的所属类别，使学生对world english这一概念有所感知，为其余部分的学习提供认知基础。
第二部分以一篇阅读文章（the road to modern english）的方式呈现，介绍了英语的分布、使用、发展等情况，使学生对world english的由来更为了解，并通过讨论等方式让学生对英语的重要性有更深的体会，激发学生对英语的求知欲。
第三部分是语言学习板块。通过单词的讲解及运用，更好地掌握一些重要的词汇。这一部分还包括英美两种英语中不同搭配的练习以及听力练习，让学生更好地认知world english这一概念。
第四部分为语言学习板块，主要是掌握命令、请求的句式以及此种句式直接引语及间接引语的转换。
第五部分是语言运用部分，包含了听、说、读、写4个板块。
●课时安排
本单元教学可分为7个课时。第一课时为reading；第二课时为language points；第三课时为grammar；第四课时为listening；第五课时为extensive reading；第六课时为writing and speaking；第七课时为consolidation and evaluation。
the history of the english language is divided into three periods: the period from 450 to 1150 is known as the old english. it is described as the period of full inflections（词尾变化）, since during most of this period the case endings of the noun, the adjective and the conjunction（结合）of the verbs were not weakened. old english was a highly inflected language. it had a complete system（体系）of declensions（变格）with four cases and conjunctions. so old english grammar differs from modern english grammar in these aspects（方面）.
the period from 1150 is known as the middle english period. it is known as the period of reducing inflections. this period was marked by important changes in the english language. the norman conquest was the cause of these changes. the change of this period had a great effect on both grammar and vocabulary. in this period many old english words were lost, but thousands of words borrowed from french and latin appeared in the english vocabulary. in the middle english period grammatical gender（性）of nouns disappeared, completely replaced by the natural gender.
the modern english period extends from 1500 to the present day. the early modern english period extends from 1500 to 1700. the chief effect of this time was great humanistic（人文主义的）movement of the renaissance. the influence of latin and greek on english was great. the nineteenth and twentieth centuries are a period of rapid expansion（扩张）for the english. vocabulary in the history of the english language.
the development of the english language in america can be separated into three periods: the first period extends from the settlement of jamestown in 1607 to the end of colonial（殖民地的）times. in this period the population in america numbered about
