Unit 2 Healthy Lifestyle-Discover Useful Structures 教案 -2022-2023学年高中英语人教版（2019）选择性必修第三册

人教版（2019）高中英语选修三Unit 2 Healthy lifestyle Discover useful structures Teaching contents 教学内容 The infinitive as the subject 动词不定式作主语 Type课型：Grammar Teaching Objectives 教学目标 By the end of this period, students will be able to: 1. master the usage of the infinitive as the subject. 2. use the relevant grammar flexibly and authentically in real situations. 3. understand the difference between the infinitive as the subject and the v. -ing form as the subject. Teaching key points 教学重点 1. Help students identify the usage of the infinitive as the subject. 2. Guide students to use the infinitive as the subject to express their own ideas. Teaching difficult points 教学难点 How to use the infinitive as the subject in real situations. Teaching procedures 教学过程 I. Lead-in II. Self-directed study III. Complete the sentences. IV. Practice V. Homework Teaching details 教学详案 I. Lead in Activity 1 Look at the following sentences and pay attention to the italicized infinitives, and tell their meanings and functions. 1. To change bad habits is never easy. 2. It took the surgeon three hours to finish my mother's lung surgery. 3. To join the People's Liberation Army, it is required for men to shave off their beards. 4. It was not polite to disturb your neighbors with loud music last night. 小结：动词不定式的功能和作用：作主语。为避免句子头重脚轻，则用it作形式主语，而真正的主语to do不定式置后。 Activity 2 Find more infinitives in the reading passage. More infinitives in the reading passage: 1.... it can be easy for some of them to form bad habits. 2. After all, it is not easy to break bad habits. Step II Self-directed study Fill in the blanks. （ 1）用作主语的不定式及短语常出现在谓语动词之后，而句首用形式主语it 代替。 It is not right for people with the virus to go to public places. （ 2）单个不定式作主语，谓语动词用单数形式。 To get enough protein each day is beneficial to our health. To get good grades requires a lot of hard work. （3）常用句型： ① It is + adj. + for /of sb. + to do sth. 形容词表示事物或行为的特点或性质，介词用for，如 difficult, possible，necessary. 形容词表示人的品格或特点，介词用of，如 kind，polite，impol