unit9 When was it invented课件.ppt

Whenwasitinvented?,SectionA,1b,Listenandmatchtheinventionswiththedates.,a,b,e,d,c,18761885192719711976,d,a,b,e,c,1c,PAIRWORK,1c,PAIRWORK,Whenwasthetelephoneinvented?Ithinkitwasinventedin1876.,JulieThompson,battery-operatedslippers,ChelseaLanmon,heatedicecreamscoop,JayceCoziarandJamieEllsworth,shoeswithadjustableheels,2a,Listenandnumbertheinventionsintheorderthatyouhear.,3,1,2,2b,PAIRWORK,Whowasit/weretheyinventedby?Itwas/TheywereinventedbyChelseaLanmon.,3b,PAIRWORK,Whatdoyouthinkisthemosthelpfulinvention?Ithinkthemosthelpfulinventionisthelightbulb.Whyisthat?Well,itgivespeoplemoretimetoworkandplayeveryday.,Thepassivevoice.,被动语态,英语中动词有主动语态和被动语态两种语态.主动语态表示主语是动作的执行者,被动语态表示主语是动作的承受者,在被动语态中动作的执行者有时用by短语表示出来.,被动语态的构成:,助动词be+(及物动词的)过去分词,一般现在时,一般过去时,Thepassivevoice.,被动语态,被动语态的用法:,不知动作执行者时,常用被动语态.eg.Mybikewasstolenyesterday.ThiscarismadeinAmerican.2.不必要说出动作执行者时,常用.eg.Romewasnotbuiltinaday.3.为了突出强调动作的承受者时,常用被动语态.eg.Thousandsofbeachesarepolluted(污染).,Thepassivevoice.,被动语态,主动语态变为被动语态的步骤:,把原主动句中的宾语转换为被动语态的主语.2.把动词改为被动形式,即“be+过去分词”.注意be动词要按新的主语的人称和数进行变化,时态要和原来的主动语态的时态保持一致.3.原来主动语态句中的主语,如果需要,就放在by后面以它的宾格形式出现.如果没有必要就可以省略.其他的成分(定语,状语)不变,句式也不能变.,Thepassivevoice.,被动语态,主动语态变被动语态的结构图:,Bellinventedthetelephonein1876.ThetelephonewasinventedbyBellin1876.,主语,谓语动词过去时,宾语,时间状语,主语,谓语动词的过去分词,宾语,时间状语,Thepassivevoice.,被动语态,主动语态改被动语态:,Bell,invented