高中英语外研版 (2019)选择性必修 第二册Unit 5 A delicate world评课ppt课件

这是一份高中英语外研版 (2019)选择性必修 第二册Unit 5 A delicate world评课ppt课件，共41页。PPT课件主要包含了Grammar，宾语从句，不定式，It作形式宾语，真正的宾语是，有宾语补足语，动名词，It 指代不定式，It 指代动名词，It 指代从句等内容，欢迎下载使用。
N visitr wuld think it surprising that the islandis a UNESCO Wrld Heritage Sited. Experts felt it necessary t cme up with a plan t remve all the rabbits frm the island.
Analyze the structure f the sentences
Analyze the structure f the sentencesWhat des “it” refer t in sentence(a) and sentence (c)?
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N visitr wuld think it surprising that the island is a UNESCO Wrld Heritage SiteN visitr wuld think that the island being a UNESCO Wrld Heritage Site is surprising.
c. Experts felt it necessary t cme up with a plan t remve all the rabbits frm the island.d. Experts felt t cme up with a plan t remve all the rabbits frm the island was necessary
具备了这两个条件， 形式宾语it一定要用。
think/find/cnsider/feel/make/regard it + 形容词/名词+ t d sth
I find it pleasant t wrk with him.All these nises made it impssible fr me t g n the wrk. They felt it my hnr t be invited t speak here.She cnsiders it her duty t take care f us.
动词+ it n gd/n use/useless ding sth
The prfessr cnsiders it n gd reading withut understandingD yu cnsider it any gd trying again?He fund it useless(n use) arguing with him.
动词+ it+ 形容词/名词+从句
We all thught it a pity that the perfrmance had been delayedYu shuld make it clear whether yu want it r nt.They fund it pleasant that they wrked with us Chinese.
动词+ it +介词短语+从句
We we it t yu that there wasn’t a serius accident.I tk it fr granted that they were nt cming.
appreciate/hate/like/lve+ it +if/when+从句
I hate it when my mther asks me t eat eggs.I wuld appreciate it if yu culd cnsider my applicatin
动词+it+过去分词+从句
He made it knwn t everyne that he was right.
it 作形式宾语的用法？
当不定式、动名词或从句在某个句子中作宾语时，为了保持句子的结构平衡，常用it作为形式宾语，而将真正的宾语放到句子后部去。it 没有具体的意义，仅用于维持句子结构平衡。构成结构为： 动词+it+宾语补足语+真正的宾语it作形式宾语宾要有三种情况：代表不定式作形式宾语、代表动名词作形式宾语、代表宾语从句作形式宾语。常见的以it作形式宾语的动词有：feel, cnsider, find, believe, make, take, imagine, prve, think, suppse, regard, ntice等。
it 代表不定式作形式宾语
He fund it pleasant t wrk with us Chinese.He makes it a rule never t brrw mney frm thers.I dn’t feel it difficult t understand the passage.注意：当真正的宾语是动词不定式（短语）时，不定式（短语）可以有自己的逻辑主语，该逻辑主语常由fr引出。e.g. He likes stay up late, s he ften feels sleepy, which makes it difficult fr him t cncentrate n what he is ding.（逻辑主语和真正的主语保持一致，都是he）He likes stay up late, s he ften feels sleepy, which makes it uncmfrtable fr his clleagues t wrk with him.（逻辑主语his clleagues和真正的主语he不一致）
it 代表动名词作形式宾语
I think it n gd spending t much time watching TV.我认为花太多时间看电视是没有好处的。I feel it hard wrk persuading him int ding it.我感觉说服他做那件事很难。用v-ing（短语）作真正的宾语时，其宾补通常是n use, n gd, a waste, hard wrk等。
it 代表宾语从句作形式宾语
动词+it+that从句（常见于take, have, put等动词之后）I take it that he will finish the task by himself.我认为他能自己完成这项任务。动词+it+when/if从句（常见于hate, like, lve, appreciate, enjy, prefer等动词之后）I hate it when he talks with his muth full.I’d appreciate it if yu culd d us a favur.
在一些特殊结构中，用it作形式宾语。动词+it+介词短语+that从句take it fr granted that ... 认为……是理所当然的we it t sb. that ... 多亏……/幸亏……bring it t sb’s attentin that ... 让某人注意到……He seemed t take it fr granted that he shuld speak as a representative.I we it t my teacher that I made such rapid prgress.Yu shuld bring it t his attentin that yu are t weak t g n wrking.你应该让他注意到你太虚弱而不能继续工作。
在一些特殊结构中，用it作形式宾语。动词+介词+it+that从句see t it that ... 确保……lk t it that ... 看……/指望……insist n it that ... 坚持……stick t it that 坚持……answer fr it that ...回答……depend n it that ... 依靠……Wuld yu see t it that she gets hme early?He insisted n it that he was inncent.
动词+it+过去分词+that从句He made it knwn t everyne that he was right.他让每个人都明白他是对的。
Let’s practice
1. I cnsider it n use ___________(talk) with him abut it .2. I dn’t think _______ pssible t master a freign language withut much memry wrk.3. I wuld appreciate _______ if yu wuld like t teach me hw t use the cmputer.4. The Internet makes it pssible _________(share ) the latest news.5. I think _______ my duty t help her.
6. We all thught it a pity __________ the cnference shuld have been cancelled.7. They tk ________ fr granted that I wuld be n gd at it .
Translate the fllwing sentences
1. Children feel it safe and happy t be with their parents.2. I find it hard t get alng with her.3. Mdern technlgy has made it pssible t fly in space.4. The heavy rain made it mre difficult fr us t finish the wrk n time.5. We thught it n use explaining t him what happened.
many peple think it a gd idea t keep this turtle as a petbelieve it n big issue t release them int the wild
Rewrite the underlined parts using it as an empty bject.
3. peple have fund it a threat t ther species t release these turtles int the wild4. Experts cnsider it imprtant fr wners t keep their pets in an enclsed area
Lk at the pictures f the Saihanba Natinal Frest Park and describe its changes using it as an empty bject where apprpriate.
present day
I think it a breakthrugh t transfrm a desert int a frest…
nuns/adjectivesbreakthrugh impssible likely unrealistic…
t d /thatgrwinvestigate plant trees transfrm…
1. absrb __________________ 2. disslved nutrients __________________3. rely n __________________4. prvide energy __________________
Vcabulary building: Ecsystems
Pay attentin t the wrds and expressins in bld.
5. feed n ____________________6. prey n ____________________7. break dwn ____________________ 8. release ____________________
Lk at the diagram and answer the questins.
1.What des the diagram shw?
The diagram shws a fd chain – the cnnectin between the living things.
2. What are the relatinships between the living things?
The living things are clsely cnnected with each ther by the fd they eat. Secndary cnsumers prey n primary cnsumers, primary cnsumers feed n prducers, and prducers
2. What are the relatinship between the living things?
absrb light frm the sun, and water and disslved nutrients frm the sil, which are prvided by decmpsers.
Cmplete the passage with the crrect frm f the wrds and expressins.
In a wdland ecsystem, trees and ther plants are prducers. They water, and take in nutrients frm the sil and energy frm the sun. Insects are an example f a primary cnsumer. They the prducers t prvide fd fr them, and are by secndary cnsumers: small mammals and birds. They the primary cnsumers. Wrms, fungi
and bacteria are decmpsers. They animal waste and the remains f living things. The chemicals these decmpsers fertilise the sil and give the plants the nutrients they need t grw.
Listening & speaking
Listening & speaking: Befre listening
• One f the ldest species in the ecsystem, the hney bee has been in existence fr millins f years.• A hney bee can fly as fast as 24 kilmetres per hur and its wings can beat 200 times per secnd.• In just ne jurney t cllect pllen and nectar, ne single hney bee can pllinate as many as 50 t 100 flwers.
Backgrund infrmatin
Listening & speaking: While-listening
Listen t the cnversatin and chse the true statements.
1. Bees are very imprtant t ur fd supply because they prvide hney.2. The bee ppulatin is declining.3. Withut bees, humans wuld die ut.4. All human crps depend n bees fr pllinatin.
5. If bees became extinct, ther insects culd pllinate enugh crps.6. Humans are respnsible fr the decline in the bee ppulatin.
A cmbinatin f things damages bee habitats, mainly ________________________________.
Listen again and cmplete the flw chart.
The bee ppulatin is ______________________. Accrding t statistics, bee numbers in the US _______________________in just ne year.
pesticides and climate changes
declining very quickly
have fallen by 17%
Withut bees, crps wuld ___________________. _____________ wuld nt be able t cmpensate fr the lss f bees, because __________________ _______________________ f the species f crps.
Animals that live n the crps _______________
be unable t reprduce
Other insects
bees are respnsible
wuld die ut
fr pllinating abut 70%
Listening & speaking: Summary
Yu must be kidding! • Are yu sure abut ... ? I dn’t believe it! • Check it ut fr yurself ... It’s a fact! • Accrding t statistics ... Dn’t frget that …
Cmplete the bxes with the expressins frm the cnversatin.
• Yu must be kidding! • I dn’t believe it! • Are yu sure abut ... ?
• It’s a fact!• Dn’t frget that…• Check it ut fr yurself... • Accrding t statistics...