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

Unit 2 Healthy lifestyle Learning About Language Discover useful structures to-infinitive as the subject 选择性必修 第三册 Lead in 1 To change bad habits is never easy. The Infinitive is the subject of the sentence! The Infinitive is the real subject of the sentence! It took extra time to do the job properly. To join the People’s Liberation Army, it is required for men to shave off their beards. It was not polite to disturb your neighbors with loud music last night. 4 3 2 What are the functions of the colored parts in the sentences? 2 Find more infinitives in the reading passage. To prevent harmful habits like these from dominating a teenager’s life is essential. It can be easy for some of them to form bad habits. It is not easy to break bad habits. The Infinitives are the subjects of the sentences! Below is a blog entry about eating out and eating at home. Find the sentences that use to-infinitives as subjects and fill in the table below. A Exploring the rules Below is a blog entry about eating out and eating at home. Find the sentences that use to-infinitives as subjects and fill in the table below. To-infinitives as subjects To eat out was also a social activity, ... ..., it was not that difficult to make a simple and tasty dish. A Exploring the rules When the to-infinitive is used as a subject, we usually use the preparatory subject at the beginning of the sentence. it A Exploring the rules Be Singular form Infinitive as the subject of the sentence: Example 1: To help others is our duty. Subject Predicative Example 2: To get good grade requires a lot of hard work. Subject Verb Singular form Object Part 1 Grammar Infinitive as the real subject of the sentence: It is +adj.+(for sb) to do （describing sth.) (adj: easy ,difficult, comfortable, pleasant, light, heavy,dangerous， tiresome, interesting , fit) It is important for everyone to learn English well in our rapidly developing worl