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

1、目录contentsGrammarVocabulary buildingHomeworkListening&speakingIIIIIIIGrammar 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.Grammar:It as an empty objectLook at the sente

2、nces and answer the questions.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.1.What does“it”refer to in sentences(a)and(c)?Grammar:It as an empty objectLook at

3、the sentences and answer the questions.Sentences(a)and(c)are from the reading passage.“It”in sentence(a)refers to“the island is a UNESCO World Heritage Site”.“It”in sentence(c)refers to“to come up with a plan to remove all the rabbits from the island”.2.What is the difference between the sentences i

4、n each group?Grammar:It as an empty objectLook at the sentences and answer the questions.Sentences(a)and(c)are from the reading passage.When the object of a sentence is a that-clause(b)or an infinitive(d),we sometimes use“it”as an empty object and put the real object later to keep balance.For exampl

5、e,sentence(a)uses“it”as the empty object of 2.What is the difference between the sentences in each group?Grammar:It as an empty objectLook at the sentences and answer the questions.Sentences(a)and(c)are from the reading passage.“think”,referring to the real object:“the island is a UNESCO World Herit

6、age Site”.Sentence(b)uses that-clause as the object of“think”.Grammar:It as an empty objectWork in pairs:Now look for more sentences with this structure in the reading passage,and summarise its use in your own words.it 作为形式宾语的两种基本用法：Grammar:It as an empty object当动词不定式，动名词和从句在某个句中作宾语时，为当动词不定式，动名词和从句在

7、某个句中作宾语时，为了保持句子的结构平衡，常用了保持句子的结构平衡，常用itit作形式宾语，而将真正作形式宾语，而将真正的宾语放到句子后部去。的宾语放到句子后部去。1）He found it not easy to learn a foreign language well.他发现学好一门外语是不容易的。2）I think it necessary that we have the meeting.我认为我们开这个会是有必要的。0,000 people reading my blog!b I love to photograph the rising sun,it 作为形式宾语的几种特殊情况：

8、Grammar:It as an empty object1）动词动词+it+that 从句从句，常见于 take,have,put 等动词之后。例：I take it that he will finish the task by himself.我认为他能自己完成这项任务。0,000 people reading my blog!b I love to photograph the rising sun,2）动词动词+it+when/if 从句从句，常见于appreciate,enjoy,like,prefer 等动词之后。例:We really appreciate it if you

9、could do us a favour.如果您能帮助我们，我们会很感激。Grammar:It as an empty object0,000 people reading my blog!b I love to photograph the rising sun,3）动词动词+it+介词短语介词短语+that 从句从句，常见于 owe it to sb,take it for granted 等结构中。例：We owe it to you that we are still alive.多亏有你，我们现在才仍然活着。0,000 people reading my blog!b I love

10、to photograph the rising sun,4）动词动词+it+过去分词过去分词+从句。从句。例：He made it known to everyone that he was right.他让每个人都明白他是对的。it 作为形式宾语的几种特殊情况：it 作为形式宾语的几种特殊情况：Grammar:It as an empty object0,000 people reading my blog!b I love to photograph the rising sun,5）动词动词+介词介词+it+that 从句从句，常见于 look to,depend on,insist

11、on,stick to,answer for 等结构中。例：She insisted on it that she was innocent.她坚持说自己是无辜的。Rewrite the underlined parts using it as an empty object.Grammar:It as an empty object The red-eared slider,a species of freshwater turtle,is native to the Southern United States and Northern Mexico.Due to its cute app

12、earance,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.Rewrite the underlined parts using it as an empty object.Grammar:It as an

13、 empty objectThese days,people 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.Grammar:It as an empty objectm

14、any people think keeping this turtle as a pet is a good ideamany people think it a good idea to keep this turtle as a pet Rewrite the underlined parts using it as an empty object.Grammar:It as an empty objectRewrite the underlined parts using it as an empty object.believe to release them into the wi

15、ld is no big issuebelieve it no big issue to release them into the wild Grammar:It as an empty objectpeople have found to release these turtles into the wild is a threat to other speciespeople have found it a threat to other species to release these turtles into the wild Rewrite the underlined parts

16、 using it as an empty object.Grammar:It as an empty objectExperts consider owners keeping their pets in an enclosed area importantExperts consider it important for owners to keep their pets in an enclosed areaRewrite the underlined parts using it as an empty object.Grammar:It as an empty objectLook

17、at the pictures of the Saihanba National Forest Park and describe its changes using it as an empty object where appropriate.present day 1960s Grammar:It as an empty object nouns/adjectives to do/that breakthrough impossible likely unrealistic.growinvestigateplant treestransform.I think it a breakthr

18、ough to transform a desert into a forest.You may refer to the words and expressions in the table for help.Grammar:It as an empty objectNow work in pairs.Describe how a place you know has changed using it as an empty object where appropriate.IIVocabulary building0,000 people reading my blog!b I love

19、to photograph the rising sun,1.absorb _ 2.dissolved nutrients _3.rely on _4.provide energy _吸收，摄入吸收，摄入溶解溶解的的营养物质营养物质依靠，依赖依靠，依赖提供能量提供能量Vocabulary building:EcosystemsPay attention to the words and expressions in bold.0,000 people reading my blog!b I love to photograph the rising sun,5.feed on _6.prey

20、on _7.break down _ 8.release _以以为食为食 捕食，掠夺捕食，掠夺Vocabulary building:Ecosystems分解分解释放释放Pay attention to the words and expressions in bold.Vocabulary building:EcosystemsLook at the diagram and answer the questions.Vocabulary building:Ecosystems1.What does the diagram show?The diagram shows a food chain

21、 the connection between the living things.QuestionsAnswersLook at the diagram and answer the questions.Vocabulary building:Ecosystems2.What are the relationships between the living things?The living things are closely connected with each other by the food they eat.Secondary consumers prey on primary

22、 consumers,primary consumers feed on producers,and producersQuestionsAnswersLook at the diagram and answer the questions.Vocabulary building:Ecosystems2.What are the relationship between the living things?absorb light from the sun,and water and dissolved nutrients from the soil,which are provided by

23、 decomposers.QuestionsAnswersLook at the diagram and answer the questions.Vocabulary building:EcosystemsComplete the passage with the correct form of the words and expressions.In a woodland ecosystem,trees and other plants are producers.They water,and take in nutrients from the soil and energy from

24、the sun.Insects are an example of a primary consumer.They the producers to provide food for them,and are by secondary consumers:small mammals and birds.They the primary consumers.Worms,fungiabsorbrely on fed onprey onVocabulary building:EcosystemsComplete the passage with the correct form of the wor

25、ds and expressions.and bacteria are decomposers.They animal waste and the remains of living things.The chemicals these decomposers fertilise the soil and give the plants the nutrients they need to grow.break downreleaseIIIListening&speaking Listening&speaking:Before listening One of the oldest speci

26、es in the ecosystem.the honey beehas been in existence for millions of years.A honey bee can fly as fast as 24 kilometres per hour andits wings can beat 200 times per second.Injust one journey to collect pollen and nectar,one singlehoney bee can pollinate asmany as50 to 100 flowers.One of the oldest

27、 species in the ecosystem,the honey bee has been in existence for millions of years.A honey bee can fly as fast as 24 kilometres per hour and its wings can beat 200 times per second.In just one journey to collect pollen and nectar,one single honey bee can pollinate as many as 50 to 100 flowers.Backg

28、round informationListening&speaking:While-listeningListen to the conversation and choose the true statements.Beesare very important to our food supply becausetheyprovide honey.2 The bee population is declining.3 Without bees,humans would die out.4 All human crops depend on beesfor pollination.S If b

29、ees became extinct,other insectscould pollinate1.Bees are very important to our food supply because they provide honey.2.The bee population is declining.3.Without bees,humans would die out.4.All human crops depend on bees for pollination.Listening&speaking:While-listeningListen to the conversation a

30、nd choose the true statements.Beesare very important to our food supply becausetheyprovide honey.2 The bee population is declining.3 Without bees,humans would die out.4 All human crops depend on beesfor pollination.S If bees became extinct,other insectscould pollinate5.If bees became extinct,other i

31、nsects could pollinate enough crops.6.Humans are responsible for the decline in the bee population.Listening&speaking:While-listeningA combination of things damages bee habitats,mainly _.Listen again and complete the flow chart.The bee population is _.According to statistics,bee numbers in the US _i

32、n just one year.pesticides and climate changesdeclining very quicklyhave fallen by 17%Without bees,crops would _._ would not be able to compensate for the loss of bees,because _ _ of the species of crops.Listening&speaking:While-listeningListen again and complete the flow chart.Animals that live on

33、the crops _be unable to reproduceOther insectsbees are responsiblewould die outfor pollinating about 70%Humans have nothing to eat and die out.Listening&speaking:Summaryhave fun You must be kidding!Are you sure about.?I dont believe it!Check it out for yourself.Its a fact!According to statistics.Don

34、t forget that Expressing doubtResponding to doubtComplete the boxes with the expressions from the conversation.Listening&speaking:SummaryExpressing doubtResponding to doubt You must be kidding!I dont believe it!Are you sure about.?Its a fact!Dont forget that Check it out for yourself.According to st

35、atistics.Complete the boxes with the expressions from the conversation.Listening&speaking:Pair work Work in pairs.Talk about what would happen to the ecosystem if another species died out.Use the words and expressions in this section.HomeworkHomework1.Summarize the usage of It as an empty object and do the relevant exercises.2.Describe how a place you know has changed using it as an empty object where appropriate.