人教版（2019）必修 第二册Unit 2 Wildlife protection Discovering Useful Structures课件(共28张PPT)

(共28张PPT)
UNIT 2 WILDLIFE PROTECTION
Section Ⅲ Discovering Useful Structures
1.通过对教材的理解,了解重要语言点的基本用法。（语言能力）
2.通过分析教材例句，理解和掌握现在进行时的被动语态的用法。（语言能力）
3.通过导学案的套用,以练促学,巩固内化现在进行时的被动语态的用法,并学以致用。（学习能力）
核心单词
知识点1 reduce vt.减少；缩小；降低 ＊reduction n.减少
（P18）It is reported that living spaces for wildlife are being reduced due to the cutting of trees.据报道，由于砍伐树木，野生生物的生存空间正在减少。
知识拓展
reduce stress 减少压力
reduce waste 减少浪费；减少废弃物
reduce...to... 把……减少到……（to表示结果）
reduce...by... 把……减少了……（by表示幅度）
rise/increase to... 增加到……
rise/increase by... 增加了……
经典佳句
Resolving arguments can improve your emotional health，because it increases your reactivity and reduces the chance of you getting angry.解决争吵可以改善你的情绪健康，因为它提升了你的反应能力，减少了你生气的机会。
The document called for reducing the number of hungry people by half within 20 years.该文件呼吁在20年内将饥饿人数减半。
融会应用
Ⅰ.单句填空
（1）The camera was reduced ___ half of its original price.
to
（2）If their marketing plans are successful, they will increase their sales ____ 20%.
by
（3）The _________（reduce） of unemployment should be the most important thing.
reduction
Ⅱ.单句写作
（4）The number of bikes they produce ___________________100,000 this year.今年
他们生产的自行车数量已经减少到10万辆。
has been reduced to
（5）What they earn ___________________30% in the last three months.在过去的三
个月里，他们的收入减少了30%。
has been reduced by
短语句式
知识点2 due to 由于；因为
（P18）It is reported that living spaces for wildlife are being reduced due to the cutting of trees.据报道,由于砍伐树木,野生生物的生存空间正在减少。
知识拓展
be due to do sth 预定/计划做某事
be due to sb 应支付/给予/归于某人
be due for sth 应得到某物
图解释义
Your headache is due to stress.你的头痛是由压力造成的。
名师点拨
due to可在句中作表语、定语或状语；作状语时不可置于句首。
融会应用 单句填空
（1）The boat is due _________（arrive） at 10:00,so remember to meet me on time.
to arrive
（2）Thank you for delivering my goods here. Ten dollars is due ___ you.
to
（3）When the car is due ____ its annual service again, please remind me.
for
知识点3 search for 搜索；查找
（P19）They got up early so as to search for wild birds.他们起得很早以便寻找野鸟。
知识拓展
search sp for sb/sth 搜查某地以寻找某人/某物
search sb for sth 搜某人的身以寻找某物
search out 找出；查出
in search of 寻找；寻求
经典佳句
Tom hurried into the room as if in search of something important. He searched the drawer for John's telephone number. And then he began to search for his address again.汤姆匆匆进入房间，好像在寻找重要的东西。他在抽屉里找约翰的电话号码，然后他又开始寻找他的地址。
融会应用 单句填空
（1）After the fire broke out, the rescue team was sent to search ____ the survivors.
for
（2）The young man drove around the town ___ search of a good hotel.
in
（3）They carried out several air searches ____ the injured in the crash.
for
（4）The villagers were searching the forest ____ the monkey.
for
现在进行时的被动语态
自主探究
阅读下列句子,并注意黑体部分的用法。
1.African elephants are being hunted.非洲大象正在被猎杀。
2.What is being done to help them 现在正在做些什么来帮助它们呢
3.What measures are being taken to help them 现在正在采取哪些措施来帮助它们呢
我的发现 以上句子谓语动词的形式均为______________,为
______________________的结构。
be being done
现在进行时的被动语态
探究点1 现在进行时的被动语态的含义与结构
1.现在进行时的被动语态表示正在进行的被动动作，发生在说话人说话时或现阶段。
2.现在进行时的被动语态的构成:be+being+done （过去分词）；be being done 中的be动词应随主语而变化。
注意:现在进行时的被动语态中不能漏掉being。
融会应用 用所给词的适当形式填空
（1）In that country, some animals ______________________ （not protect） well
enough.
are not being protected
（2）We can hear that the papers ________________ （print） quickly on the fast-
moving printing machines.
are being printed
（3）What you ______________ （tell） is true.
are being told
（4）An interesting experiment _______________ （carry） out now.
is being carried
探究点2 现在进行时的被动语态的形式
现在进行时的被动语态的主要形式有肯定式、否定式和疑问式。它们的具体构成如下:
肯定式:主语+am/is/are+being done
否定式:主语+am/is/are+not+being done
一般疑问式:Am/Is/Are（+not）+主语+being done
特殊疑问式:特殊疑问词+am/is/are（+not）+being done
An antelope sadly said，“We are being killed for the wool beneath our stomachs.” 一只羚羊伤心地说：“我们因我们腹下的羊毛而正被杀害。”
The tiger is not being set free at present. 目前这只老虎没有被放出来。
Are Milu deer being sent to their hometown 麋鹿正被运往它们的家乡吗
What is being done for the Milu deer 现在正在为麋鹿做些什么呢
融会应用 同义句转换
（1）Are the workers building the bridge at present
→Is the bridge ___________ by the workers at present
being built
（2）The doctor is operating on the patient inside now.
→The patient ___________________ by the doctor inside now.
is being operated on
（3）The scientists are studying the life of the panda at present.
→The life of the panda _______________ by the scientists at present.
is being studied
探究点3 现在进行时的被动语态的用法
1.基本用法
（1）表示现在正在进行或发生的被动动作,常与now、right now、at present、at the moment等时间状语连用。
She is being examined by the doctor now.她现在正在接受医生的检查。
Look！ The children are being taken care of by their aunt.看！孩子们正由他们的姑妈照顾。
（2）表示现阶段正在进行的被动动作,此时此刻不一定正在发生。
A new factory is being built.一座新的工厂正在建设中。
They are being taught English at present.目前他们正在被教英语。
（3）表示经常性或习惯性的被动行为,常与always、often等词连用,往往带有赞扬、责备、厌烦或埋怨等感彩。
Tom is always being praised by the teacher.汤姆总是被老师表扬。
2.特殊用法
（1）“be+under/in/on+n.”结构可以表示现在进行时的被动语态的含义。
The problem is under discussion now.= The problem is being discussed now.这个问题正在讨论中。
（2）少数及物动词的进行时的被动语态表示某物按计划、安排将要进行的一个被动动作。
Some rock music is being played by them next.下面将由他们演奏一些摇滚音乐。
（3）含情态动词的现在进行时的被动语态表示对现在正在发生的被动行为的推测。
John is not here. He must be being interviewed.约翰不在这里。他一定是正在接受采访。
融会应用 单句写作
（1）Look! The foreign guests ______________________ （正在被带领参观） the
factory by Mr Lee.
are being shown around
（2）I have to go to work by taxi because my car ________________ （正在修理）
at the garage.
is being repaired
（3）How many bridges ______________ （正在修建） in the village now
are being built
Ⅰ.单句填空
1.The high-speed railway between Beijing and Zhangjiakou _____________（build）
at present.
is being built
2.Now young people ____________________（encourage） to think carefully about
their future plans by their parents and teachers.
are being encouraged
3.The bridge ________________（repair） at present, so we will have to choose
another route.
is being repaired
4.According to reports, nowadays sharks _______________（kill） at a surprising rate
worldwide per year.
are being killed
5.The school library _________________（decorate） these days, so you can't borrow
any books from it.
is being decorated
Ⅱ.把下列句子变成被动语态
1.People are using music therapy to treat different medical conditions and illnesses.
→__________________________by people to treat different medical conditions and
illnesses.
Music therapy is being used
2.Air pollution is damaging some of the pictures in the museum.
→Some of the pictures in the museum ________________________________.
are being damaged by air pollution
3.They are designing a new system to give students easy access to the digital
resources of the library.
→A new system _________________________ to give students easy access to the
digital resources of the library.
is being designed by them
4.They are studying the Milu deer at the research centre.
→The Milu deer __________________by them at the research centre.
is/are being studied
5.Is she teaching the boy a lesson
→______________________ a lesson by her
Is the boy being taught
6.Now the father is making his baby laugh.
→Now the baby ______________________by the father.
is being made to laugh
Ⅲ.语法填空
Pandas are the mascot of the WWF and 1.__________________（protect） by
both the WWF and the Chinese government. However, they are not the only animals
in danger. Other endangered species 2.___________________（discover） in China by
the WWF on a regular basis. One example is the porpoise（江豚） in the Yangtze
River. They 3.________________（study） now as their number decreases. Another is
the tiger in Northeast China, which 4._________________（observe） because it is
almost dying out. Over the years the WWF has won many prizes for its work, but
now it will be given the task of presenting prizes of its own. Prizes will be given to
the organizations that protect wildlife well. People around the world
5.____________________（encourage） to pay more attention to wildlife.
are being protected
are being discovered
are being studied
is being observed
are being encouraged