Unit 5 A delicate world Using language 课件-2024-2025学年高中英语外研版（2019）选择性必修第二册

P3 Using language A delicate world Unit 5  含义  类型 it作为形式主语，代替句子的逻辑主语，并无实际词义。这可以保持句子的结构平衡，避免主语太长，显得头重脚轻。 it作形式主语 It指代不定式 It指代动名词 It指代从句  常见句型 (1)It is clear / obvious / true / possible / certain / … that… (2)It is important / necessary/ right / strange / natural / … that… (should) do… (3)It is said / reported / learnt / … that… (4)It is suggested / ordered / required /… that... (should) do... (5)It is a pity / shame / …that… (6)It happens / seems / looks /appears/… that… (7)It doesn’t matter whether / if … (8)It looks /seems as if … (9)It is + adj. +of sb + to do… / It + be + adj. + for sb + to do (10)It takes …(some time) to do (11)It is/was a waste of time doing… (12)It is/was no good/use doing… (13)It is/was worth/worthwhile doing… Look at the sentences and answer the questions. Group 2 Group 1 0,000 people reading my blog! b I love to photograph the rising sun, … 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. 0,000 people reading my blog! b I love to photograph the rising sun, … 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. What does “it” refer to in sentences (a) and (c)? 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. 1. This incident made it clear that the rat, mouse and rabbit problem needed solving once and for all. (U5 P68) 2. This intervention is a long, much-delayed ending to a sad story, but we humans owe it to the island to give it a happy ending. (U5 P68) 3. Channels of communication, such as the mobile phone and the Internet, have made it possible to speak instantly with someone on the other side of the planet, enabling us to form close connections with people of completely different cultures. (U4 P55) Focus on 基本用法 it as an empty object ① 用法及常见情况 ② 特殊情况 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。此用法中常见的及物动词有believe/feel/find/make/regard/ consider/think/suppose/ 等。6+1+2+3 ＊I consider it a priority to maintain a healthy work-life balance. ＊He found it no use arguing with his father. ＊We regard it a pleasure that we work with a team of talented and motivated individuals. it代表不定式 it代表动名词 it代表连接代词或副词引导的从句 it作形式宾语用法及常见情况归纳 1. 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. We really appreciate it if you could do us a favour. 2. 动词 + it + when / if从句，常见于appreciate, enjoy, like, prefer, hate, dislike, love等动词之后。 it作形式宾语的几种特殊情况 it作形式宾语的几种特殊情况 3. 动词 + it + 介词短语 + that从句，常见于owe it to sb, take it for granted等结构中。 We owe it to you that we are still alive. 4. 动词 + 介词+ it + that从句，常见于look to, depend on, insist on, stick to, answer for,see to等结构中。 She insisted on it that she was innocent. 5. 动词 + it + 过去分词 + 从句 He made it known to everyone that he was right. Check your answers. P70 2 Rewrite the underlined parts using it as an empty object. 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 people have found it a threat to other species to release these turtles into the wild Experts consider it important for owners to keep their pets in an enclosed area Look at the pictures of the Saihanba National Forest Park and describe its changes using it as an empty object where appropriate. P71 3 Possible answer: I think it a breakthrough to transform a desert into a forest. In the 1960s, Saihanba was a desert, which made it impossible to grow plants. Besides, I feel it unrealistic to plant trees without water. But in fact, some workers investigated it and found it likely to grow crops and plant trees. Then, they felt it their duty to recreate the forest of Saihanba. As a result, Saihanba has become a beautiful forest park. it作形式宾语 用法及 常见情况 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。 特殊情况 动词 + it + that从句，常见于take, have, put等动词之后。 动词 + it + when / if从句，常见于appreciate, enjoy, like, prefer等动词之后。 动词 + it + 介词短语 + that从句，常见于owe it to sb, take it for granted等结构中。 动词 + it + V-ed+ 从句 动词 + 介词+ it + that从句, look to, depend on, insist on, stick to, answer for等结构中。 Ⅰ. 用适当的内容或括号中所给单词的适当形式填空。 1. I find _____ very necessary to have these courses, for they can enrich the school life of each student. 2. Alice was proud of her role as a nurse and thought ____　　　　　a wise decision to go back to nursing. 3. You may feel it surprising ______ the 7-year-old Russian girl can speak three languages fluently. 4. No matter where she is, she makes it a rule ________(go) for a walk after supper. 5. Tony thinks it a waste of time _________(play) video games, so he is always working hard. it it that to go playing Ⅱ. 根据汉语提示，完成句子。 1. Some people feel the need to fully explore the oceans, that is because it ________________________________________(将使人类发现……成为可能) new sources of food and energy. 2. My mother __________________________(认为……是理所当然的) she helps those in trouble and never expects anything in return. 3. When I am on holiday in France, you ________________(一定确保) everything in the company will be all right. 4. I ____________________________ (已经向他说清楚) I will return his book soon. 5. I ______________________________ (认为想出……是我们的责任) new and creative solutions to the problem we are facing now. will make it possible for humans to discover takes it for granted that see to it that have made it clear to him that think it our duty to come up with $$