Unit2 Period 4 Discovering Useful Structures （ppt课件）-2022新人教版（2019）《高中英语》必修第二册.pptx

1、Discovering Useful Structuresn By the end of this period,you will be able to1.know about the structure of the present continuous passive voice and its function.2.master the usage of the present continuous passive voice.3.use the present continuous passive voice flexibly in the real context.1.African

2、 elephants are being hunted._2.What is being done to help them?_3.What measures are being taken to help them?_Differences：_Observe and analyze 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

3、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Summarize the structure of the present continuous passive voice.Structure&Function肯定结构_否定结构_一般疑问结构_特殊疑问结构_be(am/is/are)being donebe(am/is/are)notbeing donebe(am/is/are)主语主语being done特殊疑问词特殊疑问

4、词be(am/is/are)主语being done1.My sister is now being interviewed.Function:_2.Many interesting experiments are being carried out these days.Function:_3.He is always being praised by the leader.Function:_ _4.A celebration is being held this weekend for his success.Function:_Observe the following sentenc

5、es and figure out the function of the present continuous passive voice.Structure&Function被动语态的使用情境：不被动语态的使用情境：不知道或者不需要提及动作知道或者不需要提及动作的发出者；强调动作的承的发出者；强调动作的承受者。受者。有时可表示按计划或安排将要进行的一个被动动作。表示此时此刻正在进行的被动动作。表示现阶段正在进行的被动动作(该动作在说话的瞬间未必正在进行)。这种用法常常带有赞扬或厌恶的感情色彩。表示一种经常性的被动行为，常和always,constantly 等表示频度的副词连用，Choos

6、e the suitable verb forms to complete the sentences.Consolidation1.Im(working/being worked)at home today because my office is(painted/being painted).2.The alarming report is(written/being written).It will be finished soon.3.What part of the city is(attacked/being attacked)now?4.Right now,the deer ar

7、e(watched/being watched)over by many volunteers.5.Who is(hunting/being hunted)the kangaroos?Where are they(hunted/being hunted)?6.It is reported that living spaces for wildlife are(reduced/being reduced)due to the cutting of trees.Consolidation 1.The zoo is opening a new area for the two baby elepha

8、nts._2.The doctors are not examining the patient._3.They are raising more funds for research into wildlife protection._4.The city is setting up a new nature reserve for endangered animals._5.Today we are completing our writing task online._Rewrite the sentences using the present continuous passive v

9、oice.Today our writing task is being completed online.A new area is being opened for the a two baby elephants(by the zoo).The patient is not being examined(by the doctors).More funds are being raised for research into wildlife protection.A new nature reserve is being set up for endangered animals in

10、/by the city.Consolidation 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 there with my friends to watch the birds and study them.That was an interesting place for all of us.But thin

11、gs 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 parts _(cover)with new houses.You can see rubbish everywhere.The wetland _(pollute)seriously every day.I a

12、m 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 killedis being destroyedare being covered Consolidation Hello,everyone!Ive just come back from a wonderful t

13、rip 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 effect this will have on the local wildlife._.We should all think about this.A.Visitors are being told to pay more attention t

14、o 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 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

15、 the speech with the correct sentences or clauses.Then discuss possible solutions in groups.EABCD Summary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。I.Finish the exercises on the work sheet.（on Workbook P68-69）.II.Make small conversations with your classmates using the present continuous passive voice.