UNIT 3 Section Ⅳ Discovering Useful Structures（课件PPT）-【新课程学案】新教材2023-2024学年高中英语必修2 （人教版）

Section Ⅳ　Discovering Useful Structures UNIT 3 　　(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　 Over the years, Zhou Zhanbin has witnessed① the reserve's improving environment. “The Heihe River's water level has risen② from below 40 centimeters decades ago to about 2 meters now，” he said.“Willow trees and grasses have been planted③ along the river banks, and more migratory birds are coming to this area.”According to Zhou Zhanbin, director of the county's wetland park administration office, to date, more than 460 hectares of vegetation have been restored④ in the part of the nature reserve in Gaotai county. Zhou said that last year, more than 56,000 birds were recorded⑤ in the reserve, which is becoming an increasingly important wintering site for those are migrating, as well as a breeding site for species under state protection.“10 monitoring stations have also been set up⑥ in the reserve to study the distribution and migration of the birds，” Zhou added.With more birds calling the reserve their home, Zhou has become⑦ their devoted guardian.Every time he finds an injured or sick bird, he escorts it to a nearby rescue station via rowboat.“The environment has improved⑧， 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加蓝部分为现在完成时的主动语态形式； ③④⑥加蓝部分为现在完成时的被动语态形式； ⑤加蓝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逻辑上的被动关系。 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? ④A tiger in the city zoo has run out and hasn't been caught. [会发现] ①②③④句都使用了现在完成时的被动语态。①②句为现在完成时的被动语态的 式；③句为 式；④句为