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课件网) 新人教选择性必修Book 3 Unit 2 Healthy Lifestyle Discover useful structures P17 Underline the sentences in the text. 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. They must learn to recognise bad habits early and make appropriate changes. To change bad habits is never easy, even with many attempts. We make a choice to do something, and then we repeat it over and over again. Lead-in Soon that choice becomes automatic and forms a habit that is much harder to change. Firstly, there is a “cue”, an action, event, or situation that acts as a signal to do something. The reward makes us much more likely to continue the cycle, ... To facilitate a positive change in our bad habits, we must first examine our bad habit cycles and then try to adapt them. For example, we could try to replace a negative routine with something more positive. Aside from changing bad habits, we can also use the habit cycle to create good habits. You have the power to build a happy and healthy life of good habits. Lead-in For example, when we come to an escalator, our normal routine is to ride it, but we could change this routine into something more positive by taking the stairs instead. Many of us try to change bad habits quickly, and if we are not successful straight away, we often become pessimistic and give up. In fact, the most successful way to change is not suddenly, but over a period of time. To reach the goal of change, a person must show some discipline and repeatedly take many small steps. After all, it is not easy to break bad habits. For young people, there is plenty of time to change bad habits. Find more in the rest of the text. Lead-in Presentation/Practice 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. When I set out to do something, I do my best to achieve it. My target is to prepare myself for my degree in biology at 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 动词不定式作主语 不定式作主语，表示具体的、一次性的或将来的动作；在很多情况下，人们通常用it作为形式上的主语，而把不定式移到谓语之后，使句子结构显得平稳一些。 To see is to believe. It is right to give up smoking. It's very nice of you to be so considerate. 1. 不定式具有名词的特征，可在句子中充当主 语。 To know oneself is difficult. 人贵有自知之明。 动词不定式作主语 不定式和动名词作主语的区别 不定式：表示具体的某次动作，特别是将来的动作。 To teach you the uses of the infinitive is my job today. 教你们不定式的用法是我今天的工作。 动词-ing形式：表示比较抽象的、经常性的、一般性动作。 Teaching is my job. 教学是我的工作。 动词不定式作主语 2. ... ...
