Unit 2 Discovering Useful Structures 教学（ppt课件）-2022新人教版（2019）《高中英语》必修第二册.pptx

1、Unit 2 Wildlife ProtectionSection B Discovering Useful Structures CONTENTSLeading-inWhile-classAfter-classPart 1Part 1Part 2Part 2Part 3Part 3Part.1Leading-inLeading in 1.African elephants are being hunted._ 2.What is being done to help them?_ 3.What measures are being taken to help them?_ Differenc

2、es：_Underline the present continuous passive voice,change them into active voice and compare the differences in meaning.所强调的重点（主语）不同。Hunters are hunting African elephants.What are people doing to help them?What measures are people taking to help them?濒危动物 猎人 事件 人们 措施 大家Part.2While-classWhile-class1

3、reduce(1)vt.减少,缩小(尺寸、数量、价格等)reduceto减少减少到到reduceby 以以(比例比例)减少减少Costs have been reduced by 20%over the past year.过去一年,成本已经减少了20%。(2)vt.使沦为,使陷入(不好的境地)be reduced to(doing)sth.使陷入使陷入(更坏的更坏的)境地境地;使沦落使沦落;使陷入窘境使陷入窘境They were reduced to begging in the streets.他们沦落到沿街乞讨。The attentions of the media reduced he

4、r to tears.媒体的关注把她弄哭了。While-class(3)vt.使简化为reduce sth.to sth.将将概括成概括成(或简化为或简化为)We can reduce the problem to two main issues.我们可以将这个问题概括成两个要点。(4)vi.节食,减肥(=on a diet)She has been reducing for the last few weeks.最近几个星期她一直在节食。While-class2 due(1)adj.应支付的;应有的,适当的He got his due reward.他得到了应得的报酬。We paid due

5、 attention to the problem.我们对此问题给予了应有的注意。(2)adj.到期的The bill will be due next Monday.这张账单下星期一到期。(3)adj.预定的,约定的be due to do预定做The train is due to leave for Shanghai at 8 oclock.这趟列车定于8点出发去上海。(4)due to由于His success was due to the fact that he had been working hard.他的成功是由于他一直勤奋地工作。While-class3 in order

6、to in order to为了;以便,后接动词原形,表示目的。in order(not)to do 为了(不)做In order to succeed,we must have a complete and thorough plan.为了成功,我们必须要有一个周密的计划。Talk quietly in the reading room in order not to disturb others.在阅览室里,轻声说话,以免妨碍别人。归纳拓展in order整齐的,井然有序的in order+that从句 为了;以便(引导目的状语从句)While-class4 search for 用法详解

7、search for搜索;查找They searched for a spot where they could sit on the floor.他们在地板上寻找一处能够坐下来的地方。The villagers are searching for the missing child.村民们正在搜寻那个失踪的孩子。归纳拓展searchfor搜寻以寻找in search of=in the/ones search for搜寻look for寻找While-class5 put out (1)put out把摆好;预备好(物品)Have you put out clean towels for t

8、he guests?你为客人预备好干净毛巾没有?(2)put out熄灭;扑灭Firefighters soon put the fire out.消防人员很快把火扑灭了。While-class(3)生产;制造(=to produce)The factory puts out 500 new cars a week.这家工厂每周生产500辆新汽车。(4)出版;广播;公布(=to publish or broadcast)Police have put out a description of the man they wish to question.警方公布了他们想要讯问的那名男子的特征。W

9、hile-class现在进行时的被动语态一、基本结构：1现在进行时态的被动语态的肯定式为：am/is/are+being+done。如：Thequestionisbeingdiscussedatthemeetingnow.这个问题现在正在会上被讨论。AnotherbridgeisbeingbuiltovertheChangjiangRiveratpresent.目前长江上正在建造另一座大桥。While-class2现在进行时态的被动语态的否定式为：am/is/are+not+being+done。如：Thebabyisntbeingtakengoodcareof.这婴儿没在得到很好的照顾。Th

10、eanimalsarenotbeingsetfreeatpresent.目前这些动物还不能被放出。3现在进行时态的被动语态的一般疑问句需将am/is/are提到主语的前面。-Isanewlibrarybeingputupintheirschoolnow？-Yes,itis.甲：他们学校现在正在建一座新图书馆吗。乙：是，正在建一座新图书馆-AreanumberofDongfengtrucksbeingshippedabroad?-No,theyarent.甲：一批东风卡车正被运往国外吗？乙：不，没有。While-class4现在进行时态的被动语态的特殊疑问句为：疑问词+am/is/are+(主语

11、)+being+done。如：Whatisbeingdonetothemachine?现在对这台机器要采取什么措施？Howmanyhousesarebeingbuiltinthevillage?村里正在建造多少房屋？Whenisthesportsmeetingbeingheldinourschool?我校将在什么时候举行运动会？While-class二、用法：1现在进行时态的被动语态的同它的主动语态一样，表示现在正在进行的被动动作。Heisbeinginterviewedbyourheadmasternow.他正在接受我们校长的采访。Thisfilmisbeingshownnow.这部电影正在

12、被放映。2现在进行时态的被动语态的同它的主动语态一样，表示现阶段正在进行的被动动作。Thediseaseisbeingstudiedbyscientists.科学家们正在研究这种疾病。Theseanimalsarebeinghuntedatsuchaspeedthattheywilldisappearsoon.以如此速度捕杀动物，他们很快就会消失。While-class现在进行时被动语态五个提醒一、不可遗漏being现在进行时的被动语态表示说话时主语正在承受谓语动词的动作，谓语动词的形式为“is/are/ambeing过去分词”。如果把being漏掉，就成为一般现在时被动语态或系表结构。试比较

13、下列句子：Look！Thechildrenarebeingtakencareofbytheiraunt.瞧！孩子们现在正由姑母照看着。Childrenaretakengoodcareofatschool.孩子们在校被照看得很好。（指通常情况）Thereportisbeingwrittenbyoneofthebeststudents.报告正在由一个最好的学生写着呢。Thereportiswellwritten.报告写得很好。（系表结构）While-class二.表示现阶段现在进行时被动语态也可以表示目前这一阶段主语正在承受谓语动词的动作。Manyinterestingexperimentsare

14、beingcarriedoutthesedays.最近正在进行许多有趣的实验。（说话时，并不一定在进行）While-class三.表示计划或安排现在进行时被动语态还可表示按计划、安排主语将要承受谓语动词的动作（仅限于bring，take，send，hold，sing，show，play等表示移动的或能用来表示某项活动的少数及物动词）。Afolksongisbeingsungnext.下面将演唱一首民间歌曲。Apartyisbeingheldtonight.今晚将要举行一场晚会。While-class四.没有进行时被动语态contain，include，impress，feel，want，lik

15、e，love，satisfy，surprise，own等一些表示状态、心理活动、拥有等意义的动词（和主动语态一样）一般不用进行时被动语态，常用一般现在时被动语态表示此时此刻或目前主语承受谓语动词的动作。XiaoWang,comehere.Youarewantedonthephone.?小王，过来，有人打电话找你呢。Footballisbecomingmoreandmorepopular.Inotherwords,itislovedbymoreandmorepeople.足球现在越来越流行了，换句话说，它被越来越多的人喜爱。While-class五.其它形式表示被动结构“beunder/in等介

16、词名词”结构可代替进行时被动语态。Thecityisunderattack（isbeingattacked）atthemoment.目前这个城市正受到进攻。Thetelephoneisinuse（isbeingused）now.电话正在使用中。Whlie-class In the wetland of my hometown,there are many different kinds of animals,including wild birds,fish,snakes,insects and so on.When I was in primary school,I often went t

17、here with my friends to watch the birds and study them.That was an interesting place for all of us.But things have begun to change in recent years.Small birds _(catch)with nets.Wild ducks _(sell)at food markets.Fish and snakes _(kill)for food in restaurants.And even worse,the wetland _(destroy).Some

18、 parts _(cover)with new houses.You can see rubbish everywhere.The wetland _(pollute)seriously every day.I am very worried about it.What can we do?Finish the following passage with the present continuous passive voice of the verbs in brackets.is being pollutedare being caughtare being soldare being k

19、illedis being destroyedare being coveredPart.3After-classAfter-class Hello,everyone!Ive just come back from a wonderful trip to Tibet.It was so beautiful there that_.The scenery was so impressive and the air was so fresh and clean._.However,_.Cans,_ as they pass through Tibet.I worry about the effec

20、t this will have on the local wildlife._.We should all think about this.A.Visitors are being told to pay more attention to protecting the environment.B.this beautiful countryside is being spoiled by careless visitors C.paper and plastic bags are still being thrown away by many tour groups D.How can

21、we make visitors more aware of the damage that is being done to the environment?E.I felt I was in a fairyland(仙境)Complete the speech with the correct sentences or clauses.Then discuss possible solutions in groups.EABCDAfter-class巧学助记主动语态变被动语态的原则巧学助记主动语态变被动语态的原则:“三变三变”原则原则:原主变为原主变为by短语短语 原宾变为现主语原宾变为现主语 谓语主动变被动。谓语主动变被动。“三不变三不变”原则原则:原句意思不变原句意思不变;原句时态不变原句时态不变 原句主谓宾以外成分不变。原句主谓宾以外成分不变。Thank you！