Unit 2 Discovering Useful Structures (ppt课件)-2022新人教版（2019）《高中英语》选择性必修第三册.pptx

1、Unit 2 Healthy Lifestyle Discover useful structures 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 teenagers life is essential.They must learn to recognise bad habits early and m

2、ake 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 situatio

3、n 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 posit

4、ive.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

5、 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 discipl

6、ine 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-inPresentation/Practice My mum keeps telling me to go out with my school friends instead.Its important to meet fr

7、iends 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 plement 宾语补足语宾语补足语subject 主语主语adverbial 状语状语pred

8、icative 表语表语attribute 定语定语List the functions of the infinitives in the sentences.动词不定式动词不定式 动词不定式作主语动词不定式作主语 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.Its 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

9、主 语。To know oneself is difficult.人贵有自知之明。动词不定式作主语动词不定式作主语 不定式和动名词作主语的区别 不定式不定式：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。动词动词-ing形式形式：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。动词不定式作主语动词不定式作主语 2.不定式不定式和和when/where/how/what/whether等连等连 用，在句子中作主语用，

10、在句子中作主语。Whether to do it hasnt been decided.是否去做还没有决定。It is+形容词+for sb.+to do sth.常用于表示事物的特征特点，表示客观形式的形容词，如easy,hard,difficult,interesting,impossible等。Its very hard for him to study two languages.对他来说学两门语言是很难的。3.it作形式主语句型：作形式主语句型：动词不定式作主语动词不定式作主语 It is+形容词+of sb.+to do sth.的句型一般用表示人物的性格、品质，表示主观感情或态度

11、的形容词，如good,kind,nice,clever,foolish,right等。Its very nice of you to help me.你来帮助我，真是太好了。It is+a/an+名词+to do sth.这样的名词有：a pity,a shame,a pleasure,ones duty,an honor等。Its a great honor to be invited to your birthday party.很荣幸被邀请参加你的生日聚会。动词不定式作主语动词不定式作主语 It takes/costs/requires/makes sb./sth.to do sth.I

12、t took me two hours to finish the work.我完成那项工作用了两小时。注意：在It is+no use/no good/useless/fun/enjoyable/tiring/interesting/foolish/nice/a waste of time/apleasure.句型中常用动名词形式做真正的主语。Its no use waiting here doing nothing.无所事事地等待是没有用的。（1）Sometimes its better _(remain)silent.（2）Although is a hard task to prote

13、ct our environment,we cant help but go ahead.（3）_ (control)the air pollution is necessary.（4）It was foolish him to endanger his life in that way.（5）Dont you think it is rude him to ask a lady her age?Practice语法填空：根据提示完成句子。of of it To control/Controlling to remain（6）It is difficult him to live on suc

14、h a small salary.（7）I dont think _ （你问是不礼貌的）how long the interview will last.（8）_（保卫 是我 们的职责）the country against its enemies.（9）_ （花了我半 个小时）to wash the clothes.Practice语法填空：根据提示完成句子。for it is impolite of you to ask Its our duty to defend It took me half an hour ProductionJoin the words to make full

15、sentences using the infinitive.1.important/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 _2It is important to avoid passive

16、 cigarette smoking.It will take an hour for a nutrition specialist to make a balanced diet menu for you.It is useful to turn to a fitness consulant for advice.It is dangerous to take illegal drugs.It is harmful to skip breakfast(too)often.Complete the conversations with the correct forms of the phra

17、ses in the box.31.A:Hello,doctor.I want to lose weight,but I just cant seem to do it.What can you do to help me?B:Well,first,its 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 a

18、pp,but my phones full.B:So delete a few files.Im sure the app doesnt take up much space.begin with be in control of make a choice decide on make up ones mindbe in control of decide on Complete the conversations with the correct forms of the phrases in the box.33.A:Before exercising,always do a few w

19、arm-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 Im going to eat both!B:Wow!Dont eat too much junk food-youll get fat.Ive actually _ to go on a diet,so Ill just stick to the fruit salad.begin with be in control of make a choice decide on make up ones mindmade up my mind begin withto make choices