Unit 3 The Internet Discovering Useful Structures 导学案高中英语人教版必修第二册.docx
(2025年)
B2Unit3DiscoveringUsefulStructures导学案
【LearningObjectives】
Inthisclass,studentswill:
1.identifyandsummarizetheformandthefunctionsofthepresentperfectpassivevoice.
2.comparethepresentperfectpassivevoicewiththeactiveandchangetheactiveformintothepassiveform.
【预习案】将下列句子变成被动语态。
1.ManypeoplearoundtheglobespeakChinesenow.
2.Someonestolemybikeyesterday.
3.Wewillfinishthereportbytomorrow.
4.HuntersarehuntingAfricanelephantseveryyear.
5.TheInternethasgreatlyimprovedJanslife.
【探究案】
1.现在完成时的结构
主动式
被动式
肯定式
否定式
一般疑问句
特殊疑问句
2.主动语态变为被动语态的原则
三变:原句主语;宾语;谓语
三不变:原句意思、时态和主谓宾以外的部分
3.将下列句子变为被动语态。
Theylookveryhappybecausetheyhavesolvedthedifficultproblems.
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Scientistshavemadeanewrobotwhichcanwalkandtalklikehumans.
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ThegovernmenthasspentalotofmoneyontheHopeProject.
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HastheschoolsentthemabroadtostudyEnglish?
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Whohasthehostinvited?
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现在完成时的被动语态
定义:
1.表示动作已经被完成,或截止到现在,与since+过去时间,sofar/uptonow/bynow到目前为止,recently/lately最近,forthreedays,overtheyears,inthepasttenyears在过去的10年里,overthelasttwomonths在过去的两个月里,等时间状语连用;
eg.Thechildhasbeentakencareofbyhisgrandmaovertheyears.
eg.Thesoftwarehasbeendownloadedtohelpmyphonebatterylastlonger.
eg.FirstasaPCandthenasalaptop,acomputerhasbeenusedinofficesandhomessincethe
1970s.
Tips注意事项:
①由finish,buy,start,begin,post,return,borrow,marry,open等词构成的现在完成时的被
动语态,不能与表示段时间的状语,如forfourdays,howlong等连用,而要改换动词或时
态。
判断正误:
*Howlonghasthisbookbeenbought?()