1、Unit 3 现在完成时被动语态现在完成时用法：用法：1.表示发生在过去且已经完成的动作对现在造成的影响或结果表示发生在过去且已经完成的动作对现在造成的影响或结果 2.表示动作从过去延续到现在并有可能继续延续下去表示动作从过去延续到现在并有可能继续延续下去基本结构：主语基本结构：主语+have/has+done+其他其他The countryside has changed a lot in the past few years.We have seen that film before.之前我们已经看过那部电影了。之前我们已经看过那部电影了。现在现在过去过去将来将来一、用法：1、表示发生在过
2、去,到现在已经完成的动作对现在的影响。表示动作从过去延续到现在并有可能继表示动作从过去延续到现在并有可能继续延续下去续延续下去2、动词和被修饰主语构成被动关系。二、构成：肯定式：have/has been done否定式：have/has not been done一般疑问句：Have/Has+主语+been done?特殊疑问句：疑问词+have/has+主语+been done?三、解题步骤 1.根据句意确定时态 2.确定主被动 3.定谓have/has现在完成时与现在完成时被动语态的动词形式现在完成时与现在完成时被动语态的动词形式找出找出下面句子的下面句子的谓语谓语结构，哪些是结构，哪些
3、是主动主动？哪些是？哪些是被动被动？1.Jans life has been greatly improved by the Internet.2.The Internet has greatly improved Jans life.3.People have written much about the wonders of the World Wide Web.4.Much has been written about the wonders of the World Wide Web.被动被动主动主动主动主动被动被动 现在完成时现在完成时谓语谓语结构结构 主动主动被动被动have/ha
4、s donehave/has been done.已经被已经被.语 法 导 学感知句子，完成方框下的小题感知句子，完成方框下的小题一名敌人被击杀。一名敌人被击杀。An enemy has been slained.我方队友被击杀。我方队友被击杀。An ally has been slained.你被击杀了。你被击杀了。You have been slained.1.以上句子中所使用的时态和语态以上句子中所使用的时态和语态是是 。2.现在完成时的被动语态的构成为现在完成时的被动语态的构成为：。现在完成时的被动语态现在完成时的被动语态have/has been过去分词过去分词【考点精讲】【考点精讲
5、】现在完成时现在完成时1.常与以下时间状语连用：常与以下时间状语连用：recently,yet,already,just,before,lately,since+时间状语（从句）时间状语（从句）”,“for+时间段时间段”,(ever)since,these days,before,so far,in the last/past few years,up to now,till now，by+现在时间现在时间等。等。*I have just/alreay turned off the light.*They have been good friends since they met at a
6、meeting.*She has worked in the school for ten years.2.在条件、时间、让步状语从句中在条件、时间、让步状语从句中,表示将来某时已完表示将来某时已完成的动作。成的动作。*I shall post the letter as soon as I have written it.3.下列句型中常用现在完成时下列句型中常用现在完成时:It is(has been)+一段时间一段时间+since从句从句(从句用一般过去从句用一般过去时时)This/It is the first(second.)time+that从句从句(从句用从句用现现在完成时在完成
7、时)Practice I Tall buildings_(build)everywhere.have been builtShopping centers _ (rebuild).have been rebuiltSome factories _ (set up)to improve economies.have been set upeconomy knm n.经济；节约；理财The road _(widen).has been widenedMore dustbins _ (place)on the streets.dust 灰尘灰尘bin 箱子，容器；箱子，容器；dstbnhave be
8、en placedMore and more trees and flowers _(plant)on the either side of the roads.have been planted1.I have downloaded the software to help my phone battery last longer.2.Someone has lost an identity card.The software has been downloaded to help my phone battery last longer.An identity card has been
9、lost.一.单句语法填空 1Their new house _ (decorate)for two months and they will settle in it in the near future.2Their new cars _ (advertise)on the Internet for a long time.3All the athletes _ (select)from millions of people all over the country in the past two months.4Great changes _ (take)place in my home
10、town in the past ten years.5.She _ (return)this book to the library already.has been decoratedhave been advertisedhave been selected have takenhas returned二、单选题()1.Despite the previous rounds of talks，no agreement _so far by the two sides.Ahas been reached Bwas reached Cwill reach Dwill have reached
11、()2.It is the most instructive lecture that I _ since I came to this school.Aattended Bhave been attended Cam attending Dhave attended()3.In the last few years thousands of films _all over the word.Ahave producedBhave been produced Care producing Dare being producedADB()4.Look!A new library _ in the center.Ais being builtBis built Cis building Dbuilding()5.We wont start the work until all the preparations _.Aare being madeBwill be made Chave been made Dhad been madeAC
