UNIT 3 THE INTERNET Discovering Useful Structures——语法·提升语言能力（课件PPT）-【新课程学案】新教材2022-2023学年高中英语必修第二册（人教版2019）

Discovering Useful Structures—语法·提升语言能力 课时目标 1.在语言交际中理解并恰当运用现在完成时的被动语态。 2.恰当使用现在完成时主动语态和被动语态来构建有意义的语篇。 语法项目——现在完成时的被动语态 初识语法——在美文运用中体悟　 ①Over the years, Zhou Zhanbin has witnessed the reserve's improving environment. ②“The Heihe River's water level has risen from below 40 centimeters decades ago to about 2 meters now，” he said.③“Willow trees and grasses have been planted along the river banks, and more migratory birds are coming to this area.” ④According to Zhou Zhanbin, director of the county's wetland park administration office, to date, more than 460 hectares of vegetation have been restored in the part of the nature reserve in Gaotai county. ⑤Zhou said that last year, more than 56,000 birds were recorded in the reserve, which is becoming an increasingly important wintering site for those that are migrating, as well as a breeding site for species under state protection. ⑥“10 monitoring stations have also been set up in the reserve to study the distribution and migration of the birds，” Zhou added. ⑦With more birds calling the reserve their home, Wang has become their devoted guardian.Every time he finds an injured or sick bird, he escorts it to a nearby rescue station via rowboat. ⑧“The environment has improved, the air isn't so dry, and I get to see different types of birds every day.I can't bring myself to tear my eyes away from the beautiful scenery before me for even a second，” he said. ①②⑦⑧句中加黑部分为现在完成时的主动语态形式； ③④⑥句中加黑部分为现在完成时的被动语态形式； ⑤句中加黑部分为一般过去时的被动语态形式。 慧学语法——运用“形式—意义—使用”三维动态语法观　 现在完成时的被动语态表示动作已经完成，强调对现在造成的影响或结果，而且主语和谓语动词之间是被动的关系。 一、结构 肯定式 主语＋have/has been done... 否定式 主语＋have/has not been done... 一般疑问式 Have/Has＋主语＋been done ...？ 特殊疑问式 特殊疑问词＋have/has＋主语＋been done ...？ 二、用法 [先感知] ①(教材典句)Much has been written about the wonders of the World Wide Web. ②Financial problems of the company have been discussed for nearly two hours. ③How long has this film been shown? ④You shouldn't leave school before your homework has been finished. [会发现] ①②③④句都使用了___________