Unit 2 Section Ⅱ Discover useful structures-【金版新学案】2025-2026学年高中英语选择性必修第三册同步课堂高效讲义教师用书（人教版）

本高中英语讲义聚焦动词不定式作主语这一核心语法点，通过“语法串烧”短文引导学生感知黑体部分，结合“我的发现”总结其四种类型（疑问词+不定式、直接作主语、it作形式主语等），再经“语法知识精讲”系统梳理基本用法、句式结构及与-ing形式作主语的区别，最后通过“巧学活用”练习实现从感知到应用的学习支架构建。 资料以健康生活为情境载体设计语法串烧短文，渗透健康生活态度，助力文化意识培育。通过对比动词不定式与-ing形式作主语的差异，培养学生分析比较的思维品质。多样化练习（完成句子、语法填空）提升语言理解与表达能力，课中辅助教师情境化教学，课后帮助学生巩固知识、查漏补缺。

Section Ⅱ　Discover useful structures ——动词不定式作主语 阅读以下短文，感知黑体部分，并完成练习。 语法串烧 我的发现 Develop a healthy lifestyle ①How to keep healthy is always a concern for people.First of all，it is important for you ②to have a light diet every day to maintain good health.Second，③to go to bed early and get up early not only is good for health and helps prevent disease but also keeps you in good shape.Third，it's wise of you ④to laugh more every day，which can help you improve your health through good emotional control.It's important ⑤to follow good habits and keep a positive attitude.In addition，⑥to exercise for half an hour every day can improve circulation and make your body healthier.Finally，to promote health，it is also an effective way ⑦to drink enough water every day. 1.黑体部分均为动词不定式作主语。 2．加黑处①为疑问词how＋动词不定式作主语。 3．加黑处③⑥为动词不定式直接作主语。 4．加黑处②④⑤⑦所在句中动词不定式作真正的主语，it在句中作形式主语。 语法知识精讲 动词不定式作主语 动词不定式是非谓语动词的一种，没有人称和数的变化，在句中可以作主语(有名词和代词的作用)，通常表示具体的、特定的行为。 1．动词不定式作主语的基本用法 (1)动词不定式位于句首 To study English well is not easy. 学好英语不容易。 To save money now seems impossible. 现在想省钱似乎是不可能的。 (2)多数情况用it作形式主语，把真正的主语(动词不定式)置于句末，特别是动词不定式短语较长时。常用于下列句式中。 ①It＋be＋名词＋to do It's our duty to take good care of the old. 照顾老人是我们的责任。 学生用书第32页 ②It＋be＋形容词＋(for/of sb)＋to do It is difficult for us to finish writing the composition in a quarter of an hour. 我们很难在十五分钟内写完这篇作文。 It's clever of you to work out the maths problem. 你能解出这道数学题真聪明。 [温馨提示]　1.该句式结构中for sb前常用表示事物的特征、特点的形容词，如easy，hard，difficult，interesting，impossible等。 It's necessary for you to lock the car when you do not use it. 当你不用车的时候，锁车是有必要的。 2．of sb前一般用表示人物的性格、品德及主观感情或态度的形容词，如good，kind，nice，clever，foolish，right等。 It was silly of us to believe him. 我们真愚蠢，竟然相信了他。 3．“疑问词＋动词不定式短语”作主语可置于句首。 How to use the computer is a question. 如何使用计算机是个问题。 ◎巧学活用1——完成句子 ①每天练习说英语对于提高你的语言技能非常重要。 It is important to practice speaking English every day to improve your language skills. ②解决这个问题需要时间和努力。 To solve this problem takes both time and effort. ③他们为慈善捐款真是慷慨。 It is generous of them to donate money to the charity. ④学生在考试前定期复习笔记是很有帮助的。 It is helpful for students to review their notes regularly before exams. ⑤如何解决这个问题对大家来说都不清楚。 How to solve this problem is unclear to everyone. 2．动词不定式与动词-ing形式作主语的区别 (1)动词-ing形式作主语通常表示抽象动作；而动词不定式作主语表示具体动作。 Smoking is prohibited here. 这里禁止抽烟。(抽象) It is not good for you to smoke so much. 你抽这么多烟对你身体不好。(具体) (2)动词-ing形式短语作主语时，通常用以表示一件已知的事或经验。动词不定式短语作主语时，通常用来表示一件未完成的事或目的。 Climbing mountains is interesting. 爬山很有趣。(经验) To finish the task will take a long time. 完成这项任务将要花费很长时间。(未完成的事) (3)动词不定式作主语，一般用it作形式主语，把作真正的主语的动词不定式短语后置。动词-ing形式作真正的主语的句型有：It's no good (use，fun) doing/It's a waste of time doing等。 It took me only five minutes to finish the job. 我仅用了5分钟便完成了工作。 It is no good arguing with him.He never listens to others.和他争论没用，他从不听别人的。 ◎巧学活用2——单句语法填空 ①It is a waste of time arguing (argue) with her. ②It is clever of you to find (find) a solution to the problem so quickly. ③It is no use crying (cry) over the split milk. ④To finish(finish) reading the book will take you two hours. ⑤Reading (read) books is a great way to relax and reduce stress. 学生用书第33页 核心词汇练全 make up one's mind下定决心 (教材原句)We need to make up our minds and show some discipline ... 我们需要下定决心，表现出一些纪律性…… change one's mind 改变主意 bear/keep ...in mind 将……记在心中；记起；考虑 have ...in mind 考虑；打算 keep/fix one's mind on/upon 将注意力集中于…… come to/into one's mind 突然记起(或想到) read one's mind 看出某人的心思　　 [温馨提示]　make up one's mind中的名词mind有单复数的变化，根据one's的单复数来确定mind的单复数。 完成句子 上周，我原本打算去度假，但考虑到即将到来的考试，我改变了主意。我记得，努力学习会为以后带来帮助。一个关于如何改进我的学习计划的新想法突然出现在我的脑海里。几乎就像你能读懂我的心思——我意识到我需要更加有条理。 Last week，I was thinking about taking a vacation，but I changed my mind after considering my exams.I keep in mind that studying hard now will help me later.Then a new idea came to my mind about improving my study routine.It's almost as if you can read my mind—I realize I need to stay more organized. be composed of 由……组成(或构成)的 (教材原句)Life is composed of many elements，such as family，friends，study，work，entertainment，and so on. 生命是由许多元素组成的，比如家庭、朋友、学习、工作和娱乐等。 (1)be composed of＝be made up of＝consist of　　　 由……组成/构成 (2)compose vt. 组成；作曲；撰写 composition n. 作文；作曲；作品；成分 composer n. 作曲家；创作者　　 单句语法填空/一句多译 (1)The scene moved him to compose (compose) a poem. (2)We had to write a composition (compose) on the subject “My Pet”． (3) Beethoven is one of the most famous composers (compose) in history. (4)以个人或集体朗诵中国古典文学作品和才艺表演为形式的中国古典文学朗诵比赛受到所有学生的欢迎。 →A Chinese Classical Literature Recitation contest which is composed of/is made up of/consists of reciting Chinese classical literature individually or in a group and talent shows is popular with all the students.(定语从句) →A Chinese Classical Literature Recitation contest composed of/made up of/consisting of reciting Chinese classical literature individually or in a group and talent shows is popular with all the students.(分词作定语) 学生用书第34页 disturb vt.打扰；搅乱；使烦恼 (教材原句)It was not polite to disturb your neighbours with loud music last night. 昨天晚上大声放音乐打扰你的邻居是不礼貌的。 disturbed adj.　　 心神不安的；心烦意乱的；烦恼的 disturbing adj. 引起烦恼的；令人不安的 disturbance n. 打扰；扰乱　　 单句语法填空/完成句子 (1)They have developed these techniques to help those who are disturbed (disturb) by hearing voices. (2)Equally disturbing (disturb) is the fact that soon there will be a shortage of qualified teachers. (3)Successful breeding requires quiet，peaceful conditions with as little disturbance (disturb) as possible. (4)她意识到自己孤单一人，心里感到很不安。 It disturbed her to realize that she was alone. 学科网（北京）股份有限公司 $