Unit6Whenwasitinvented？（第1课时）.ppt

1、Unit6Whenwasitinvented？,PeriodOne（SectionA1a-2c),情境引入,fourgreatinventions:,compass,papermaking,gunpowder,printing,情境引入,Whenwasthe_invented?Itwasinventedin_.,1876,1885,1971,1927,1976,情境引入,lightbulb1879,Edison,1.When_thelightbulb_?Itwasinventedin_.2.Who_it_by?It_byEdison.3.Whatisit_for?Itisusedfor_peo

2、ple_inthedark.,情境引入,Thekeys:,was;invented;1879.was;invented;was;invented.used;helping;see.,情境引入,car1885,Benz.,Practice:Whenwasthecarinvented?Itwasinventedin1885.Whowasitinventedby?ItwasinventedbyBenz.Whatsitusedfor?Itsusedfortraveling.,A:Whatisthecomputerusedfor?B:Itisusedforstudying,Whatisthecalcul

3、atorusedfor?Itisusedforcalculating.,情境引入,Bell1876,Beld1927,Kelif1976,Fen.Noyma1971,情境引入,Answerthequestionsbelow:Whenwasitinvented?Whowasitinventedby?Whatsitusedfor?,Practice,Listenandmatchtheinventionswiththedates.,_1885_1927_1971_1976_,inventions,highheels,adjustable可调整的,adjustableheels,icecreamsco

4、op,scoop,heatedicecreamscoop,inventions,inventions,slippers,abattery,batteries,battery-operatedslippers,Listening,1.Listentothetapeandfinishthetask2aand2bofpage42.2.Makeconversationsusingtheinformationsin2b.,情境引入,ThePassiveVoice:被动语态,被动语态的用法:不知道动作的执行者时，常用被动语态。eg:1）Mybikewasstolenyesterday.2)Thiscari

5、smadeinAmerica.2.不必要说出动作的执行者时，常用被动语态。eg:Romewasnotbuiltinaday.3.为了突出强调动作的承受者时，常用被动语态。eg:Thousandsofbeachesarepolluted.,情境引入,ThePassiveVoice:被动语态,主动语态变被动语态的步骤：,1.把主动语态句中的动作的承受着变成被动语态句中的主语。2.把动词改为被动形式，即“be+动词的过去分词”。注意be动词要按新的主语的人称和数的变化而改变。时态要和原来的主动语态时态保持一致。3.原主动语态句中的主语，如果需要，就放在by的后面，要变成它相对应的宾格形式，如果不需要

6、，可以省略。其它成分不变。,被动语态的构成：主语+be+动词的.过去分词常见的几种时态的被动语态的句型。一般现在时：主语+be(am/is/are)+动词的过去分词+-.一般过去时：主语+was/were+动词的过去分词+-.一般将来时：主语+will/shall+be+动词的过去分词+-.含情态动词时其构成：主语+情态动词+be+动词的.过去分词.,ThePassiveVoice:被动语态,Exercises,用所给单词的正确形式填空：1)Whenwasthetelephone_(invent)?2)Thecomputercan_(help)usdomathproblems.3)Inthoseday,thewomancouldnt_(afford)aTVbecausetheywerereallyexpensive.4)Afriendof_(I)cametoseemelastweek.5)Ithinkyouneedto_(take)ahistoryclass.,Thekeys:,1)invented2)help3)afford4)mi