Unit 5 Period 2 Using language（课件）英语外研版2019选择性必修第二册

高中英语外研版2019选择性必修第二册 Unit 5 A delicate world Using language Contents 1. Lead in 2. Presentation 3. Practice 4. Language points 5. Summary 6. Assessment 7. Homework 1. Lead in ★Reviews and Answer: What does it refer to in each sentence? Lead-in 1. It is vital for them not to take any chances. 2. It is unfortunate that the film is no longer popular. it as： an empty subject 2. Presentation ★Learning language--- Observation + Comparison: Look at the sentences and answer the questions. Sentences (a) and (c) are from the reading passage. Presentation 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 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)? In sentence (a), “it” refers to “that the island is 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”. ★Learning language--- Observation + Comparison: Look at the sentences and answer the questions. Sentences (a) and (c) are from the reading passage. Presentation 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 up with a plan to remove all the rabbits from the island was necessary. 2. What is the difference between the sentences in each group? The sentences with “it” as an empty object are well balanced in structure. ★Learning language--- Observation + Comparison: Look at the sentences and answer the questions. Sentences (a) and (c) are from the reading passage. Presentation 2. What is the difference between the sentences in each group? 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 example, sentence (a) uses “it” as the empty object of “think”, referring to the real object: “the island is a UNESCO World Heritage Site”. Sentence (b) uses that-clause as the object of “think”. ★Learning language---Discovery and Summary: Read the following sentences and summarise what can be used it as an empty object. Presentation 1 They felt it difficult to finish the work in such a short time. 2 He thought it absolutely senseless attempting the impossible. 3 I took it for granted that they would not come. Summary: 我发现，可以用it作形式宾语替代的成分有：______________，______________，______________。 不定式 动名词 从句 Summary: 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。 In these cases, it carries no specific meaning--it’s used as an empty object. ★Learning language---Discovery and Summary: Presentation 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： （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。 ★Learning language---Discovery and Summary: Presentation 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： （2）动词＋it＋no good/no use/useless/a waste of time/worth one’s while...+doing... ·I’ll 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。 ★Learning language---Discovery and Summary: Presentation 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： （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 doctor’s care that he is quite well again. 多亏医生的照料，他身体又好起来了。 ★Learning language---Discovery and Summary: Presentation 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： （4）动词appreciate/hate/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。 3. Practice ★Practice1：Rewrite the underlined parts using it as an empty object. Practice The red-eared slider, a species of freshwater turtle, is native to the Southern 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 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. ★Practice1：Rewrite the underlined parts using it as an empty object. Practice 1. many people think keeping this turtle as a pet is a good idea. 2. believe to release them into the wild is no big issue. many people think it a good idea to keep this turtle as a pet. believe it no big issue to release them into the wild. ★Practice1：Rewrite the underlined parts using it as an empty object. Practice Experts consider it important for owners to keep their pets in an enclosed area. 3. people have found to release these turtles into the wild is a threat to other species. 4. Experts consider owners keeping their pets in an enclosed area important. people have found it a threat to other species to release these turtles into the wild. Look at the pictures and read about the Saihanba National Forest Park Practice Located in Chengde City, Hebei Province, Saihanba (塞罕坝) sits 450 kilometers to the north of Beijing. The place is covered with snow seven months a year. It used to be a freezing, barren desert plagued by sandstorms. However, it has been turned into the world’s largest human-made forest that covers an area of nearly 75,000 hectares. Thus, it is called a “green miracle.” ★Practice2： describe its changes using it as an empty object where appropriate. You may refer to the words and expressions in the table for help. Practice I think it a breakthrough to transform a desert into a forest… ★Practice2： describe its changes using it as an empty object where appropriate. You may refer to the words and expressions in the table for help. Practice I think it impossible to grow trees there in the 1960s. I think it unrealistic to plant trees in the desert when the workers first came to Saihanba. I think it likely to investigate the biodiversity in the Saihanba National Forest Park now. ★Reading： Look at the diagram and answer the questions. Ecosystems 1.What does the diagram show? 2.What are the relationships between the living things? ★Reading： Look at the diagram and answer the questions. Ecosystems 1.What does the diagram show? The diagram shows a food chain-the connection between the living things. ★Practice： Complete the passage with the correct form of the words and expressions in Activity 5. Ecosystems In a woodland ecosystem, trees and other plants are producers. They 1____________ water, and take in nutrients from the soil and energy 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. Fungi and bacteria are decomposers. They 5____________ animal waste and the remains of living things. The chemicals these decomposers 6____________ fertilise the soil and give the plants the nutrients they need to grow. absorb rely on fed on prey on break down release ★Reading： Look at the diagram and answer the questions. Ecosystems 2. 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 consumers,primary consumers feed on producers,and producers absorb light from the sun, and water and dissolved nutrients from the soil, which are provided by decomposers. 4. Language points Language points 1. 一种淡水龟 2.（动植物）原属于……的 3. 把……当宠物养 4. 问题不大 5. 一个对……的威胁 6. 一个封闭的空间 7.合适的动物收养所 a species of freshwater turtle be native to keep sth. as a pet be no big issue a threat to an enclosed area an appropriate animal shelter Language points 8.依靠，依赖 9.以……为食 10.捕食；猎获 11.被吸引；专心致志 12.溶解的营养物质 13.把……分解为 14.吸收；理解；收容；欺骗 rely on feed on/live on prey on be absorbed in sth./doing dissolved nutrients break down… into… take in 5. Summary Summary 条件 真正的宾语是 有宾语补足语 不定式 动名词 从句 It as an empty object (形式宾语) 6. Assessment Learning Objectives Score(1-5) 1.After learning, I am able to know the usage of it as an empty object. 2.After learning, I am able to describe the changes by using it as an empty object. 3.After learning, I am able to the relationships between the living things food chain between living things. 5-完全能；4-基本能；3-不确定；2不太能；1-完全不能 7. Homework ★Compulsory work： Finish the exercise on your exercise book. ★Optional work ： Using it as an empty object to translate the sentence. 为了建立人类命运共同体，我认为我们青少年需要努力学习以及肩负起社会的责任。我坚信，依靠互相合作、创新和永不言弃，一定可以实现梦想成真。 Homework Homework Every year for over a millennium fishermen have braved the subzero temperatures, biting winds and deep snow to search for 1 underwater fortune at Chagan Lake — one of the biggest freshwater lakes in our country. Chagan is the only place in China 2 you can still find fishermen using a Mongolian fishing method that dates back centuries and has 3 (bare) changed over time. Holes are drilled in the ice 4 (lower) a 2-kilometer-long net into position underwater. Once it fills up with fish, the net is hauled out of the water using a giant wheel turned by Mongolian horses. The largest fish in the 5 (season) first catch is believed to be lucky, and will go to the highest bidder at the auction (拍卖). an where barely to lower season’s Homework To ensure that this tradition can continue 6 damaging the lake’s ecology, fishermen keep nature in mind throughout the process. 7 (avoid) the use of modern vehicles helps reduce the chance of polluting the lake water, and the number of fish that can be caught is capped to ensure that there will be fish for years to come. Also, over the past few years, the money from the auction has been invested into protecting the lake and 8 (surround) environment. And during the summer private fishing without 9 (permit) us strictly prohibited. These preservative measures 10 (keep) the tradition alive for thousands of years and certainly will be passed on to future generations. without Avoiding surrounding permission have kept Using it as an empty object to translate the sentence. 为了建立人类命运共同体，我认为我们青少年需要努力学习以及肩负起社会的责任。我坚信，依靠互相合作、创新和永不言弃，一定可以实现梦想成真。 Homework To build a community with a shared future for mankind, I find it essential that we teenagers should study hard and shoulder social responsibilities. I firmly believe it achievable to realize our dreams through mutual cooperation, innovation and perseverance. Thank you for your listening $$