Unit 5 A delicate world Section B Using Language（教学设计）-高中英语外研版（2019）选择性必修第二册.docx

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1、Unit 5Section B Using Language教学设计科目：英语 课题：Section B Using Language课时：1课时 教学目标与核心素养：1 .掌握本课时的重点单词 dissolve nutrient worm 和短语 be native to、due to rely on feed oris prey on breakdown take in be in existence depend on、be responsiblefor contribute to的用法，并能在真实语境中灵活运用。2 .掌握it作形式宾语的用法。3 .引导学生关注话题的语用功能，学会表达

2、质疑和回应别人的质疑。4 .了解食物链中生物的相互制约、相互依存，共生共荣及生态平衡的重要性。人 类可以通过自己的努力保护各个生态系统，促进生态平衡；人类也能够为了自身 的眼前利益掠夺资源，破坏生态平衡。人类不能超自然而存在，保护生态平衡也 是保护人类自己，一旦生态平衡遭到破坏，危及整个生物圈，人类自身也在劫难 逃。教学重难点重点：it作形式宾语的用法。难点：Lit作形式宾语的用法。5 .食物链使所有的生物保持着“一物治一物”的状态，只要没有外界的破坏，食 物链就永远不会断，生态因食物链的存在而得到平衡。课前准备：多媒体，黑板，粉笔教学过程：一、Pre-class1. Greeting学生活动

3、：完成活动 1 o Look at the sentences and answer the questions. Sentence (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 that the island being a UNESCO World Heritage Site is surprising.c Experts felt

4、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 HitH refer to in sentences (a) and (c)? What is the difference between the sentences in each group?Suggested answers:

5、 It in sentence (a) refers to the island is a UNESCO World Heritage Site.It in sentence (c) refers to nto come up with a plan to remove all the rabbits from the island”. 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 o

6、bject 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.二、 While-classit作形式宾语当动词不定式(短语)、v-ing(短语)或从句作宾语时，为了保持句子结构的平衡, 常用it作形式宾语，而将真正的宾语后

7、置。此时的it无词义。其用法如下：(1)常以 it 作形式宾语的动词有：feel, consider, find, believe, make, take, imagine, prove, think, suppose, regard, notice 等。D find it easy to get on with Jim.我发现同吉姆相处很容易。（2） it作形式宾语，代替动词不定式(短语)They found it pleasant to work with us Chinese.他们发现与我们中国人一起工作很 愉快。He makes it a rule never to borrow mo

8、ney from others.他立志决不向另ll人借钱。I consider it advisable to tell her beforehand.我认为还是事先告诉她好。（3） it作形式宾语,代替v-ing（短语）用v-ing（短语）作真正的宾语时，其宾补通常是no use, no good, a waste, hard work 等 oI think it no good spending too 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 work persuading him into doing it.我感觉说

9、服他做那件事很难。（4） it作形式宾语，代替从句在一些习惯用法中,it在hatejikeJove,appreciate,enjoy,take,have等动词后作形式 宾语，代替其后的宾语从句。DI hate it when he talks with his mouth full.我讨厌他 一边吃一边说话。I like it when a book is so good that you cannot put it down.我喜欢那种碰上好书时 手不释卷的感觉。在一些特殊结构中，用it作形式宾语。take it for granted that.认为是理所当然see to it that.

10、确保owe it to.that. 多亏/幸亏We all take it for granted that James will win the game.我们都确信詹姆斯将赢得这 场比赛。Would you see to it that she gets home early?你保证她早早到家，好吗？I owe it to my teacher that I made such rapid progress.多亏了我的老师，我才取得这 么快的进步。三、After-class学生活动：学生完成活动3。Look at the pictures of the Saihanba National

11、Forest Park and describe its changes using it as an empty object where appropriate. You may refer to the words and expressions in the table for help.1960sI think it a breakthrough to transform a desert into a forest.Suggested answers:I think it a breakthrough to transform a desert into a forest. I t

12、hink it likely to plant trees in the desert. I think it impossible that crops could be grown in this area before. I think it unrealistic to investigate various plant species here.学生活动：学生完成活动4。Describe how a place you know has changed using it as an empty object where appropriate.四、Summary老师根据课堂内容，总结课上所学语法。五、完成本节课的课后练习。