人教版（2019）必修第二册 Unit 3 The Internet Discovering Useful Structures课件（共23张）.pptxVIP

Unit3DiscoveringUsefulStructurePresentPerfectPassiveVoice

完成时时态

现在完成时：have/hasdone1.过去的动作一直持续到现在IhavelivedinChinafor5years.我在中国住了5年。（从5年前到现在，现在还在中国）

2.过去的动作对现在产生影响Someonehasbrokenthewindow.(窗户现在是坏的)Ihavealreadylostthekey.(我现在没有钥匙)Ihaventreadthebookyet.(不了解书的内容)

现在完成时主动：被动：1)动作或状态从过去开始,一直持续到现在,常与下列时间状语连用:sofar,uptonow,uptillnow,bynow,recently,lately,inrecentyears;(ever)since+一般过去时,in/during/overthepast/last...years/months/days/weeks,overtheyears1.Hisfirstnovelhasreceivedgoodreviewssinceitcameoutlastmonth.2)动作或状态发生在过去,但对现在有影响或结果2.Igotcaughtintherainandmysuithasbeendamaged.have/hasdonehave/hasbeendone

现在完成时主动：被动：3)固定句型:It/This/Thatisthefirst(second,third…)timethat…+现在完成时，表示“第几次做某事”3.Thisisthefirsttimewehaveseenafilminthecinematogetherasafamily.have/hasdonehave/hasbeendone

Whatispresentperfecttense?present(now)futurepast现在完成时 have/hasdone（过去分词）表示说话时已经完成的动作，而且这个动作的结果对现在仍有影响;表示动作发生在过去，但一直持续到现在，并且有可能继续持续下去。

练习1.Everymeans______(try)toprotectpandasoverthepast10years.2.Manykindsofapps______(create)toattractyoungpeopletoplaygamessofar.3.Manywords_____(add)tothelanguagesinceitwaspublished.hasbeentriedhavebeencreatedhavebeenadded

肯定式：have/hasbeendone...否定式：have/hasnotbeendone...一般问句：Have/Has+主语+beendone特殊疑问句：疑问词+have/has+主语+beendone现在完成被动语态的基本结构

Thesingerhasbeeninvited(byTom).Thesingerhasnotbeeninvited(byTom).Hasthesingerbeeninvited(byTom)?Whohasbeeninvited(byTom)?否定一般疑问对宾语提问

过去完成时主动：被动：1)过去的过去。常与过去完成时连用的时间状语有by/before+一般过去时BythetimeJackreturnedfromhomefromEngland,hissonhadgraduatedfromcollege.2)固定句型:It/Thiswasthefirst/second/third