Unit6Whenwasitinvented？

PeriodOne（SectionA1a-2c)情境引入

fourgreatinventions:compasspapermakinggunpowderprinting情境引入

Whenwasthe_____invented?Itwasinventedin________.18761885197119271976情境引入

lightbulb1879Edison1.When____thelightbulb____?Itwasinventedin______.2.Who_____it_______by?It____________byEdison.3.Whatisit______for?Itisusedfor____people_____inthedark.情境引入

Thekeys:was;invented;1879.was;invented;was;invented.used;helping;see.情境引入

car1885Benz.Practice:Whenwasthecarinvented?Itwasinventedin1885.Whowasitinventedby?ItwasinventedbyBenz.What’situsedfor?It’susedfortraveling.A:Whatisthecomputerusedfor?B:ItisusedforstudyingWhatisthecalculatorusedfor?Itisusedforcalculating.情境引入

Bell1876Beld1927Kelif1976Fen.Noyma1971情境引入

Answerthequestionsbelow:Whenwasitinvented?Whowasitinventedby?What’situsedfor?PracticeListenandmatchtheinventionswiththedates._______1885_______1927_______1971_______1976_______inventionshighheelsadjustable可調(diào)整的adjustableheelsicecreamscoopscoopheatedicecreamscoopinventionsinventionsslippersabatterybatteriesbattery-operatedslippersListening1.Listentothetapeandfinishthetask2aand2bofpage42.2.Makeconversationsusingtheinformationsin2b.情境引入

ThePassiveVoice:被動(dòng)語(yǔ)態(tài)被動(dòng)語(yǔ)態(tài)的用法:不知道動(dòng)作的執(zhí)行者時(shí)，常用被動(dòng)語(yǔ)態(tài)。

eg:1）Mybikewasstolenyesterday.2)ThiscarismadeinAmerica.2.不必要說(shuō)出動(dòng)作的執(zhí)行者時(shí)，常用被動(dòng)語(yǔ)態(tài)。

eg:Romewasnotbuiltinaday.3.為了突出強(qiáng)調(diào)動(dòng)作的承受者時(shí)，常用被動(dòng)語(yǔ)態(tài)。

eg:Thousandsofbeachesarepolluted.情境引入

ThePassiveVoice:被動(dòng)語(yǔ)態(tài)主動(dòng)語(yǔ)態(tài)變被動(dòng)語(yǔ)態(tài)的步驟：1.把主動(dòng)語(yǔ)態(tài)句中的動(dòng)作的承受著變成被動(dòng)語(yǔ)態(tài)句中的主語(yǔ)。2.把動(dòng)詞改為被動(dòng)形式，即“be+動(dòng)詞的過(guò)去分詞”。注意be動(dòng)詞要按新的主語(yǔ)的人稱(chēng)和數(shù)的變化而改變。時(shí)態(tài)要和原來(lái)的主動(dòng)語(yǔ)態(tài)時(shí)態(tài)保持一致。3.原主動(dòng)語(yǔ)態(tài)句中的主語(yǔ)，如果需要，就放在by的后面，要變成它相對(duì)應(yīng)的賓格形式，如果不需要，可以省略。其它成分不變。

被動(dòng)語(yǔ)態(tài)的構(gòu)成：主語(yǔ)+be+動(dòng)詞的.過(guò)去分詞常見(jiàn)的幾種時(shí)態(tài)的被動(dòng)語(yǔ)態(tài)的句型。一般現(xiàn)在時(shí)：主語(yǔ)+be(am/is/are)+動(dòng)詞的過(guò)去分詞+.一般過(guò)去時(shí)：主語(yǔ)+was/were+動(dòng)詞的過(guò)去分詞+.一般將來(lái)時(shí)：主語(yǔ)+will/shall+be+動(dòng)詞的過(guò)去分詞+.含情態(tài)動(dòng)詞時(shí)其構(gòu)成：主語(yǔ)+情態(tài)動(dòng)詞+be+動(dòng)詞的.過(guò)去分詞.ThePassiveVoice:被動(dòng)語(yǔ)態(tài)Exercises用所給單詞的正確形式填空：1)Whenwasthetelephone_____(invent)?2)Thecomputercan____(help)usdomathproblems.3)Inthoseday,thewomancouldn't____(afford)aTVbecausetheywerereallyexpensive.4)Afriendof____(I)cametoseemelastweek.5)Ithinkyouneedto___(take)ahistoryclass.Thekeys:1)invented2)help