Unit 2 Healthy Lifestyle Discover Useful Structures 课件 -2025-2026学年高中英语人教版选择性必修第三册

Healthy Lifestyle Discover Useful Structures Unit 2 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 neighbours with loud music last night. 5. To prevent harmful habits like these from dominating a teenager's life is essential. 6. It can be easy for some of them to form bad habits. 7. After all, it is not easy to break bad habits. 总 结 1.以上句子中动词不定式都是作 。 2.句(2)(3)(4)(6)(7)中it作 ，真正的主语是后面的 。 主语 形式主语 动词不定式 Lead-in 不定式和动名词作主语的区别 1. To teach you the uses of the infinitive is my job today. 2. Teaching is my job. 3. To get a good grade in this exam is my aim today. 4. Playing football is my hobby. ________（get) a good grade in this exam is my aim today. ________（do) morning exercises is good for your health. ________（read) the book again is necessary. To see is to believe. = Seeing is believing. 前后保持一致 Practice To read To get Doing (表具体行为) (表经常性行为) 不定式做主语表示 具体的某次动作 , 特别是指将来的动作； 动名词做主语表示 经常性的、一般性动作 。 3 不定式作主语基本用法 一. 动词不定式作主语，位于句首，谓语动词用单数。 两个或两个以上动词不定式并列作主语，若语意不一致则用复数；但如果动词不定式作为一个整体或属于同一概念，仍用单数。 To improve people’s lives and to speed up socialist construction are our two important tasks today. Early to go to bed and early to rise makes a man healthy. To love and to be loved is the greatest happiness one can get. 4 二. it作形式主语 为了避免头重脚轻，常用it作形式主语放在句首， 作主语的不定式常置于句末。 不定式作主语基本用法 It is not right for people with the virus to go to public places. It was not polite to disturb your neighbours with loud music last night. To join the People’s LiberationArmy, it is a rule for men to shave off their beards. It took the surgeon three hours to finish my mother’s lung surgery. 5 It was hard him to live on his small income. 依靠他那点工资维持生活很难。 It was careless you to leave your umbrella on the train. 你真粗心，把伞忘在火车上。 比如：easy ,difficult, comfortable, pleasant, dangerous，tiresome, interesting , heavy 等。 for of 在 It is+adj.+for sb to do...句型中 这类形容词常表示某个人做某件事是怎么样的情况。 比如：good，kind，nice，foolish，polite，considerate，careless 等。 在 It is+adj.+of sb to do...句型中，这类形容词常表示人的性格、品质 注意： 常用句型1：It is+ adj.+for/of sb +to do sth 6 It is an honour to be invited to this activity. It is my duty to pick you up at the airport. It is a shame to give up now since you have been working on it. a pity, a shame, a pleasure, one’s duty, one’s job,  good manners, bad manners等 注意： 常用句型2：It is + n. + (for sb.) to do sth. 常见的名词 It took me more than an hour to do my homework yesterday evening. It will take us a lot of money to buy that house. 做某事花费某人多长时间(钱) 注意： 常用句型3：It takes/took/will take sb. some time/money to do sth. 三. 疑问词how, what, when, where, which连用构成不定式短语做主语。 不定式作主语基本用法 1. ________________________________ is still unknown. 哪里开会还未知。 2. ________________________________ has not been decided yet. 如何解决这个问题还未决定。 3. ________________________________________ in this river is a problem. 怎样阻止他们在这条河里游泳是一个问题。 4. What to do and how to do it ______ your own business. 去做什么以及怎样去做，是你自己的事。 Where to hold the meeting How to solve the problem How to prevent them from swimming are 9 四. 注意事项 不定式作主语基本用法 有时候用It做形式主语，动名词做真正的主语 It is no use trying to convince him. He won’t listen. It’s no good staying up late every day. It’s bad for your health. It is a waste of time playing online games. 1. It is no use (good) doing sth. 2. It is useless doing sth. 3. It is no fun doing sth 4. It is worth doing sth. 5. It is a waste of time doing sth. 常见的句型有 10 1. __________(ignore) this would be a mistake.   2. How rude it was of the boy ___________(jump) the queue!   3. ________(do) morning exercises is good for your health. 4. To save money and to live a healthy life______my goals this year. 5. He told us whether ________(have) a picnic was still under discussion.   6. It is my ambition __________(make)sure that the disabled people have access to all public buildings.   7. It is not difficult __________(grasp) a foreign language if you spend time and effort on it.   8. It is good manners for you __________(give) your seat to the old.   9. It is no use ________(try) to get back the lost time. 10. What a pity it is for you ________________(miss) such a good film.   To ignore to jump Doing are to have to make to grasp to give trying to have missed Practice 11 1. __________________________in ten months was a great achievement.   10个月内就盖成那座楼是一个了不起的成就。 2. It is not very good for you _____________________.   抽这么多烟对你(身体)很不好。 3. ___________________ is to be respected.   尊重别人就是尊重自己。 4. It is not an easy thing _____________________.   精通一种语言是不容易的。 5. It made us very angry ___________________________.   听他那样谈话我们非常气愤。 To complete that building to smoke so much To respect others to master a language to hear him talk like that Practice 12 6. _____________with this situation reflects one's ability.   如何应对这种状况反映出一个人的能力。 7. It feels good ________________for a while.   出来在这里待一会儿是挺舒服的。 8. It's necessary ______________________when you do not use it.   当你不用车的时候, 锁车是有必要的。 9. It only took (us) a year _______________________.   完成这项工程只花了(我们)一年时间。 10. It's kind _________________so much of us.   你为我们想得那么多, 真是太好了。 How to deal to be out here for you to lock the car to complete the project of you to think Practice 13 Join the words to make full sentences.(P17) 1. important / avoid/ passive cigarette smoking It is important to avoid passive cigarette smoking. 2. will take / nutrition specialist / a balanced diet menu / make / an hour /for you _______________________________________________________________ 3. useful / turn to / fitness consultant / for advice _______________________________________________________________ 4. illegal / dangerous / take drugs _______________________________________________________________ 5. harmful / skip breakfast / often _______________________________________________________________ It will take nutrition specialist an hour to make a balanced diet menu for you. It is useful to turn to fitness consultant for advice. It is illegal and dangerous to take drugs. It is harmful to often skip breakfast. 14 Complete the conversations with the correct forms of the phrases in the box. 1. A: Hello, doctor. I want to lose weight, but I just can 't seem to do it. What can you do to help me? B : Well, first, it's necessary to ______________ what you eat. Cut out all fatty food and sugary drinks, and eat more fruit and vegetables. 2.A: I really need to ___________a way to exercise more. I could use a fitness app, but my phone's full. B: So delete a few files. I'm sure the app doesn't take up much space. be in control of decide on begin with be in control of make a choice decide on make up one’s mind 15 3. A: Before exercising, always do a few warm-ups to_____________. B:I know. But then I always feel too tired to continue! 4. A: Should I go for the pizza or the fried chicken? I hate _______________ like these. You know what —I'm going to eat both! B: Wow！l Don't eat too much junk food-you'll get fat. I've actually ________________ to go on a diet, so I'll just stick to the fruit salad. begin with to make a choice made up my mind begin with be in control of make a choice decide on make up one’s mind Complete the conversations with the correct forms of the phrases in the box. Discover Useful Structures Thanks! $