(
课件网) Period 2 Learning about language The infinitive of the verb used as the subject Unit 2 Healthy Lifestyle 1.Enable the Students to master the usage of the infinitive of the verb as the subject 2.Enable the Students to use the relevant grammar flexibly and authentically in the real situation. Learning Aims . The Infinitive (to do…) Lead-in Look at the following sentences and pay attention to the italicized infinitives. Find more infinitives in the reading passage, 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. 5.(2023·全国甲卷)So, it’s been useful to know how to cover up holes and repaint a room to avoid any charges when I’ve moved out. 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. 动词不定式在句中做主语，有时为了保持句子的平衡，避免头重脚轻，常用it做形式主语，而真正的主语放在句子的末尾。比如第2，3，4，5例句。 Their meanings and functions 不定式的时态和语态： 不 定 式 主 动 被 动 一 般 to write to be written 进 行 to be writing 完 成 to have written to have been written 完成进行 to have been writing 1. _____( talk ) with him is a great pleasure. 2. _____( help ) others is our duty. To talk To help It is our duty to help others. 不定式作主语： it 作为形式主语。 不定式作主语和动词-ing形式作主语和动词的区别： 动词-ing形式和不定式作主语, 都是说明一个内容。 不定式通常表示一个将来的、具体的内容; 但是, 而动词-ing形式则表示一种经常性的、习惯的或抽象的概念。 To look after children is her job today. 她今天的工作是看孩子。 Looking after children is her work. 她的工作是照顾孩子。 不定式作主语，it 做形式主语的常见结构： It is +adj.+(for sb.) to do (2024·浙江1月高考)It is so easy to let an online course slide, but your grades will suffer as a result. 让在线课程进行下去是很容易的，但你的成绩会因此受到影响。 (2022·全国乙卷)It is also helpful for you to be a friendship keeper.这对于你维护友谊同样也有帮助。 It is +adj.+(of sb.) to do It is clever of you to apply for the position.你申请这个职位，真是聪明。 It is +n.+ to do sth( an honour, our duty, a pity, a shame) It is our duty to take care of you.照顾你是我们的责任。 It takes/took sb. some time to do sth. It takes me half an hour to do my housework.我花了半个小时做家务。 疑问词 + 不定式 做主语 疑问代词：who，whom，what，which 疑问副词：when，where，how 常接该结构的动词：know，see，decide，tell，ask，consider，explain，learn，wonder How to construct the theoretical framework is very important. （作主语） 如何构建理论框架是非常重要的。 When to start developing such a vaccine is the question . （作主语） 何时开始研制这种疫苗是一个问题。 Where to find that patriotic young man is a head ... ...
