Unit 5A Delicate World Using language课件 --(2022）新外研版高中选择性必修第二册《英语》.pptx

1、Using languageUnit 5 A delicate world1.What does“it”refer to in sentences(a)and(c)?Activity 1.Look at the sentences and answer the questions.Sentences(a)and(c)are from the reading passage.a No visitor would think it surprising that the island is a UNESCO World Heritage Site.b No visitor would think

2、that the island being a UNESCO World Heritage Site is surprising.-c Experts felt it necessary to come up with a plan to remove all the rabbits from the island.d Experts felt to come up with a plan to remove all the rabbits from the island was necessary.In sentence(a),“it”refers to“that the island is

3、 a UNESCO World Heritage Site”.In sentence(c),“it”refers to“to come up with a plan to remove all the rabbits from the island”.Using language2.What is the difference between the sentences in each group?Activity 1.Look at the sentences and answer the questions.Sentences(a)and(c)are from the reading pa

4、ssage.a No visitor would think it surprising that the island is a UNESCO World Heritage Site.b No visitor would think that the island being a UNESCO World Heritage Site is surprising.-c Experts felt it necessary to come up with a plan to remove all the rabbits from the island.d Experts felt to come

5、up with a plan to remove all the rabbits from the island was necessary.The sentences with“it”as an empty object are well balanced in structure.Using languageActivity 2.Rewrite the underlined parts using it as an empty object.The red-eared slider,a species of freshwater turtle,is native to the Southe

6、rn United States and Northern Mexico.Due to its cute appearance,many people think keeping this turtle as a pet is a good idea.Recent years have seen more and more pet sliders escaping or being released from homes,and some owners believe to release them into the wild is no big issue.These days,people

7、 have found to release these turtles into the wild is a threat to other species.Experts consider owners keeping their pets in an enclosed area important,and anyone unable to keep their pets should take them to an appropriate animal shelter.Using languageActivity 2.Rewrite the underlined parts using

8、it as an empty object.1 many people think keeping this turtle as a pet is a good idea 改：Using languagemany people think it a good idea to keep this turtle as a pet2 believe to release them into the wild is no big issue 改：believe it no big issue to release them into the wild3 people have found to rel

9、ease these turtles into the wild is a threat to other species 改：people have found it a threat to other species to release these turtles into the wild4 Experts consider owners keeping their pets in an enclosed area important 改：Experts consider it important that owners should keep their pets in an enc

10、losed area（1）动词 it 形容词名词（for/of）to do从句 They considered it important to have the work done on time.他们认为按时完成这项工作很重要。We make it a rule to visit the old every weekend.我们规定每个周末都去拜访那些老人。It as an empty object(形式宾语)Using languageit 常可代替不定式（短语）、动名词（短语）或从句在句子中作形式宾语，而将真正的宾语放在句子后面，以平衡句子结构。it作形式宾语常用于以下几种情况：（2）动

11、词itno good/no use/useless/a waste of time/worth ones while.+doing.Ill make it worth your while telling me about his secret.告诉我他的秘密，我会酬谢你的。He thought it no use trying to convince them.他认为企图说服他们是没有用的。It as an empty object(形式宾语)it 常可代替不定式（短语）、动名词（短语）或从句在句子中作形式宾语，而将真正的宾语放在句子后面，以平衡句子结构。it作形式宾语常用于以下几种情况：U

12、sing language（3）动词it介词短语that.owe it to sb./sth.that.把归功于 take it for granted that.想当然认为是当然的 He owes it to his doctors care that he is quite well again.多亏医生的照料，他身体又好起来了。It as an empty object(形式宾语)it 常可代替不定式（短语）、动名词（短语）或从句在句子中作形式宾语，而将真正的宾语放在句子后面，以平衡句子结构。it作形式宾语常用于以下几种情况：Using language（4）动词appreciate/h

13、ate/love/like/dislike后面接if或when引导的从句作宾语时，中间需用形式宾语it，构成“appreciate/hate/love/like/dislike+it+if/when从句”。He will appreciate it if they can invite him.如果他们邀请他，他将非常感激。She hates it when he bragged that he was the most important.她讨厌他自吹自己最重要。It as an empty object(形式宾语)it 常可代替不定式（短语）、动名词（短语）或从句在句子中作形式宾语，而将真

14、正的宾语放在句子后面，以平衡句子结构。it作形式宾语常用于以下几种情况：Using languageUsing languageActivity 5.Look at the diagram and answer the questions.Pay attention to the words and expressions in bold.1 What does the diagram show?2 What are the relationships between the living things?This diagram shows the relationship among dif

15、ferent kinds of living things in the ecosystem.They depend on each other for a living.Activity 6.Complete the passage with the correct form of the words and expressions in Activity 5.In a woodland ecosystem,trees and other plants are producers.They 1 water,and take in nutrients from the soil and ene

16、rgy from the sun.Insects are an example of a primary consumer.They 2 the producers to provide food for them,and are 3 by secondary consumers:small mammals and birds.They 4 the primary consumers.Worms,fungi and bacteria are decomposers.They 5 animal waste and the remains of living things.The chemical

17、s these decomposers 6 fertilise the soil and give the plants the nutrients they need to grow.Using languageabsorbrely onpreyed onfeed onbreak downdissolveUsing language Words and Phrases 1.native The red-eared slider,a species of freshwater turtle,is native to the Southern United States and Northern

18、 Mexico.(教材P53)巴西红耳龟是一种淡水龟，原产于美国南部和墨西哥北部。【用法详解】：adj.出生地的；儿时居住地的；本地的；当地的；原产于某地的 ones native land/country/language 某人的故乡祖国母语 native New Yorker 土生土长的纽约人 The tiger is native to India.这种虎产于印度。Using language Words and Phrases 1.native n.出生于某国（或某地）的人；本地人；当地人；本地的动物（或植物）Li Ming is a native of Beijing.李明是北京人。

19、The kangaroo is a native of Australia.袋鼠是产于澳大利亚的动物。You can always tell the difference between the tourists and the natives.游客与当地人之间的区别一望便知。Using language Words and Phrases 2.transform vt.使改变外观（或性质），使改观使改变外观（或性质），使改观 I think it a breakthrough to transform a desert into a forest.(教材P53)我认为把沙漠变成森林是一个重大

20、突破【常见搭配】：transform.(from.)into.把（从）变成 Success and wealth transformed his character.成功和财富改变了他的性格。Their efforts have transformed the hill into one covered with green trees.他们的努力使这座山变得绿树葱茏。The movie transformed her almost overnight from an unknown schoolgirl into a superstar.这部电影几乎一下子就把她从一个默默无闻的女学生变成了一

21、位超级明星。Using language Words and Phrases 3.absorb Producers absorb water and dissolved nutrients from the soil.(教材P54)生产者从土壤中吸收水分和溶解态营养物。【用法详解】：vt.吸收（液体、气体等）；吞并；理解，掌握 Its hard to absorb so much information within 10 minutes.十分钟内掌握如此大量的信息是很困难的。In cold climates,houses need to have walls that will absorb

22、 heat.在气候寒冷的地方，房屋需要有能吸收热量的墙壁。The surrounding small towns have been absorbed into the city.四周的小城镇已并入这座城市。Using language Words and Phrases 3.absorb vt.吸引全部注意力，使全神贯注 The movement and noise of the machines absorbed him completely.机器的运转和声响完全把他吸引住了。The writer was absorbed in his writing so that he forgot

23、to close the window when the wind was picking up.这位作家全神贯注地写作，以至于风越来越大时他忘了关窗。注意：be absorbed in(doing)sth.全神贯注于（做）某事Using language Words and Phrases 4.break down Decomposers break down dead animal and vegetable matter into nutrients.(教材P55)分解者把死去的动植物分解成营养物质。【用法详解】：使分解（为），使变化（成）。为及物动词短语。Food is broken

24、down in the stomach.食物在胃里分解。（机器或车辆）坏掉，出故障。为不及物动词短语。The car broke down on the freeway.汽车在高速公路上抛锚了。The machine broke down during a busy time.正忙的时候机器出了故障。Using language Words and Phrases 4.break down Decomposers break down dead animal and vegetable matter into nutrients.(教材P55)分解者把死去的动植物分解成营养物质。【用法详解】：（讨论、关系）失败。为不及物动词短语。Negotiations between the two sides have broken down.双方谈判失败了。（健康状况）垮掉，（人）身体出毛病。为不及物动词短语。His health broke down under the pressure of work.他因工作压力身体垮掉了。