Unit 2 Discover useful structures-ppt课件--(2022)新人教版高中英语选择性必修第三册.pptx

1、HEALTHY LIFESTYLELesson 3 Discovering Useful StructuresInfinitives as the Subjects高二人教版英语选择性必修三第二单元After this lesson,you will be able to:1.understand the forms and functions of infinitives as the subjects;2.use the infinitives flexibly and authentically in the real situations;3.further discuss how t

2、o form a healthy lifestyle using infinitives of all types.To change bad habits is never easy.图片来自教材图片来自教材图片来自教材Look at the following sentences and pay attention to the infinitives.subject 主语主语subject 主语主语subject 主语主语subject 主语主语It is never easyto change bad habits.将形式主语 _ 置于句首，_ 置于句末，可以避免句子头重脚轻、结构失衡

3、。Change the sentence structures.it动词不定式动词不定式Change the sentence structures.To finish my mothers surgery took the surgeon three hours.To shave off their beards is required(for men).To disturb your neighbours with loud music last night was not polite.It is never easy to change bad habits.Page 14151.Ho

4、wever,during this period,it can be easy for some of them to form bad habits.2.To prevent harmful habits like these from dominating a teenagers life is essential.3.To change bad habits is never easy,even with many attempts.4.After all,it is not easy to break bad habits.It is essential to prevent harm

5、ful habits like these from dominating a teenagers life.It is never easy to change bad habits,even with many attempts.Change the sentence structures.However,during this period,to form bad habits can be easy for some of them.After all,to break bad habits is not easy.Translate the sentences from Englis

6、h to Chinese and then from Chinese to English.1.However,during this period,it can be easy for some of them to form bad habits.但是，在此期间，他们中的一些人很容易养成不良习惯。但是，在此期间，他们中的一些人很容易养成不良习惯。2.To prevent harmful habits like these from dominating a teenagers life is essential.防止像这样的有害习惯主宰青少年的生活是至关重要的。防止像这样的有害习惯主宰青少

7、年的生活是至关重要的。3.To change bad habits is never easy,even with many attempts.改变坏习惯绝非易事，即使尝试了很多次。改变坏习惯绝非易事，即使尝试了很多次。4.After all,it is not easy to break bad habits.毕竟，要改掉坏习惯并不容易。毕竟，要改掉坏习惯并不容易。动词不定式作主语时，谓语动词常用_。To change bad habits is never easy.To help others gives a person satisfaction.To prevent harmful

8、habits like these from dominating a teenagers life is essential.单数单数图片来自网络It will take a nutrition specialist an hour to make a balanced diet menu for you.It is useful to turn to a fitness consultant for advice.It is dangerous to take illegal drugs.It is harmful to skip breakfast too often.To get he

9、althy and get rid of bad habits,sometimes it is also a good idea to get professional help.It will take a nutrition specialist an hour to make a balanced diet menu for you.It is also useful to turn to a fitness consultant for advice.You can also help yourself with some common sense.For example,it is

10、harmful to skip breakfast too often.It is important to avoid passive cigarette smoking.And,of course,it is dangerous to take illegal drugs too.It took the surgeon three hours to finish my mothers lung surgery.To join the peoples Liberation Army,it is required for men to shave off their beards.It was

11、 not polite(of you)to disturb your neighbours with loud music last night.It is important to avoid passive cigarette smoking.It will take a nutrition specialist an hour to make a balanced diet menu for you.As a chef,it was my duty to cook,so I tried to vary the meals in whatever way I could.(Textbook

12、,Page 104)It can be easy for some teenagers to form bad habits.(Textbook,Page 104)It+is/was+_+_ sb+to do It is/was+_+to do It+takes/took/will take sb.+_+to do It+is/was _+for sb+to do It+is/was+_+_ sb+to do It is/was+_+to do It+takes/took/will take sb.+_+to do It+is/was _+for sb+to do adj.for/ofn.so

13、me timeV-ed It is smart _ you to turn to a fitness consultant for advice.It is dangerous _ you to take illegal drugs.offor在 的句式中,当该形容词用以表示to do的特征时，使用 It is/was adj._+sb.+to do；当该形容词用来表示不定式的逻辑主语(sb.)的性质、特征或品德时，使用 It is/was adj._+sb.+to do。forof 动词不定式可与疑问词when、where、how、what、which、who等组合，构成_，在句中可作_、_

14、和_。不定式短语When to start has not been decided yet.Do you know where to find Tom?My main concern is how to get there on time.subject 主语主语object 宾语宾语predicative 表语表语主语宾语表语When _(start)has not been decided yet.How _(use)the computer is the question.It has been decided where _(spend)our winter holiday.to s

15、tartto useto spendUse the correct forms of the words to fill in the blanks._(read)aloud is good for your English learning.It is quite necessary _(read)it again._(see)is to believe._(see)is believing.拓展拓展:as the subject VS as the subjectReadingto readTo seeSeeing动词不定式和动名词作主语的区别：动词不定式和动名词作主语的区别：_作主语特指

16、一次性的、具体的动作；作主语特指一次性的、具体的动作；_作主语泛指作主语泛指一般的或习惯性的动作。且作主语和表语的不定式或动名词需保一般的或习惯性的动作。且作主语和表语的不定式或动名词需保持持_。to dodoing一致图片来自网络Healthy lifestyle contributes to our fitness.图片来自网络图片来自网络But many people have the problem of overweight.图片来自网络be in control of decide on begin withmaking choicesmade up my mindEat heal

17、thilyDo exercise regularlyDrink enough waterSleep enoughStick to a healthy lifestyle图片来自网络Page 1415 They must learn to recognise bad habits early and make appropriate changes.We make a choice to do something,and then we repeat it over and over again.The reward makes us much more likely to continue t

18、he habit 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,when we come to an escalator(cue),our normal routine is to ride it.To reach the goal of change,a person must show some discipline and repeatedly take man

19、y small steps.object 宾语宾语attribute 定语定语complement 补足语补足语adverbial 状语状语object 宾语宾语predicative 表语表语adverbial 状语状语动词不定式可以在句中作_、_、_、_、_、_的成分。主语宾语表语定语状语补足语In this lesson,we have learnt 1.the forms and functions of the infinitives used as subjects;2.how to use infinitives in real situations;3.what the infinitives function as in sentences.1.Finish the exercise on Workbook Page 69.2.Use infinitives to talk about healthy lifestyle.3.Review what you have learned about the infinitives.THANK YOU!