(
课件网) Period 3 Discover useful structures Unit 2 Health lifestyle 选择性必修三 人教版（2019） 1. To learn the infinitives as the subject 2. To master some rules about infinitives as the subject 3. To do some exercise about infivitives Learning objectives My mum keeps telling me to go out with my school friends instead. It's important to meet friends in person from time to time, not just on social media. To achieve my dream, I will study hard. My target is to be admitted by my ideal university. Li Ying is the first person to join the volunteering club in her class. complement 宾语补足语 subject 主语 adverbial 状语 predicative 表语 attribute 定语 List the functions of the infinitives in the sentences. 动词不定式 Preparation Scan the first and second paragraphs of P14 ,find out sentences including “to”and analyse the function of each infinitive . To prevent harmful habits like these from dominating a teenager's life is essential. To change bad habits is never easy, even with many attempts. 不定式作主语 不定式作主语 Preparation Look at the following sentences and pay attention to the infinitives. In pairs, discuss 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. 改掉坏习惯从来都不是件容易的事。 外科医生花了三个小时才完成我母亲的肺部手术。 subject（主语） subject（真正主语） Presentation Look at the following sentences and pay attention to the infinitives. In pairs, discuss their meanings and functions. 3. To join the People's Liberation Army,it is required for men to shave of the beards. 4. It was not polite to disturb your neighbours with loud music last night. 参加人民解放军时，要求男性必须剃掉胡须。 昨晚用大声的音乐打扰你的邻居是不礼貌的。 subject（真正主语） subject（真正主语） Presentation Compare the position and function of infinitives in the following two sentences. 1. To change bad habits is never easy. 2. It took the surgeon three hours to finish my mother's lung surgery. subject（主语） subject（形式主语） subject（真正主语） 两种表达的区别并得出结论：用形 式主语it代替真正的to change bad habits符合英语表达习惯，避免句子头重脚轻、结构失衡; 如果作者有意将比较长的不定式主语放在句首，那么作者就是想要突岀不定式的内容。 Presentation Read the text in the Reading and Thinking section again and find all sentences with infinitive subjects. However, during this period, it can be easy for some of them to form bad habits. To prevent harmful habits like these from dominating a teenager's life is essential. To change bad habits is never easy, even with many attempts. After all, it is not easy to break bad habits. Presentation Translate the sentences into Chinese. However, during this period, it can be easy for some of them to form bad habits. To prevent harmful habits like these from dominating a teenager's life is essential. 然而，在这段时间里，他们中的一些人很容易养成坏习惯。 防止这些坏习惯支配青少年的 ... ...
