英语选择性必修 第三册Unit 2 Healthy Lifestyle教课课件ppt

这是一份英语选择性必修 第三册Unit 2 Healthy Lifestyle教课课件ppt，共25页。PPT课件主要包含了目录页，Lead-in，Summary，to get ，to send ，for ， to hold，is ，Homework等内容，欢迎下载使用。
Observe and Discver
Practice and Apply
Task 1 Read the fllwing sentences and analyze what part des the underlined part serve as in each sentence?
1. T change bad habits is never easy. 2. It tk the surgen three hurs t finish my mther’s lung surgery.3. T jin the Peple’s Liberatin Army, it is required fr men t shave ff their beards. 4. It was nt plite t disturb yur neighburs with lud music last night.
Task 2 Cmpare the fllwing sentences and find the differences f the subjects.
1. T change bad habits is never easy, even with many attempts. 2. T prevent harmful habits like these frm dminating a teenager’s life is essential.
3. After all, it is nt easy t break bad habits. 4. Hwever, during this perid, it can be easy fr sme f them t frm bad habits.
5. Hw t use the cmputer is a questin.6. When t g there has nt been decided yet.
动词不定式作主语有三种形式：1. 直接放在 ________ 作主语；2.为了保持句子平衡，用________作形式主语，放在句首，把真正的主语—动词不定式置于句后；3. 和 _________ 构成短语作主语。
1. T see is t believe.2. T d this is t cut the ft t fit the she.3. T say is ne thing and t d is anther.4. T make a detailed plan is a gd idea t make it successful.
从位置上看，动词不定式作主语，通常放在句首。当句子主语和表语都是非谓语时，通常要_________，例如：T see is t believe. = Seeing is believing.
Observatin 1
1. Fr him t admit his mistakes is nt easy. 2. Fr us t finish the cmpsitin in a quarter f an hur is really difficult.
动词不定式作主语可以带上自己的 ____________，一般用fr / f短语来表示。但此时多使用形式主语 it 来引起，使得句子保持平衡。例如，第2句可以改为：It is really difficult fr us t finish the cmpsitin in a quarter f an hur.
Observatin 2
1. T be wrking all day lng is a bre. 2. T have made the same mistake twice is unfrgivable.3. T lve and t be lved is the great happiness.
动词不定式作主语可以有不同的___________形式，例如，____________，_______和_______语态。
Observatin 3
1. It isn’t right t talk like that. 2. It’s difficult t master English.3. It’s hard fr me t answer the questin.4. It is better t have lved and lst than never t have lved at all.
以上四个句子有两点共同之处：1. 句子的真正主语都是____________，但都使用it作形式主语；2. 句子的表语都是______。
it + be + adj + (逻辑主语) + t d sth
Observatin 4
动词不定式的逻辑主语常用__________ 来表示，当形容词修饰动词不定式时，此时常用介词_____。当表语形容词表示不定式的逻辑主语的性质或特征时，则用介词____。
1. It isn’t right fr us t stp half way. = T stp half way is nt right.2. It’s kind f yu t think s much f us. = Yu are kind t think s much f us.
fr / f + sb
Observatin 5
1. It’s ur duty t d that. 2. It’s a mistake nt t help them. 3. It must be great fun t fly t the mn in a spaceship.
以上三个句子的表语都是 _______，它们可归纳为一个共同句式：_____________________________。
it + be + n + t d sth
Observatin 6
1. It tk me mre than an hur t d my hmewrk yesterday evening.2. It will take us a lng time t walk there.3. Hw lng des it take t get there? 4. Hw much did it cst yu t send the package?
Observatin 7
以上四个句子是动词不定式作真正主语，由 it 作形式主语引导的句子，它们的谓语是 _________。它们的共同句式是________________________________________，表示某人花多少时间或金钱做某事。
it takes (csts) sb sme time / mney t d sth
1. Hw t use the cmputer is a questin.2. Where t put the bikes is being discussed.3. When and where t have the meeting has nt been decided.
________和动词不定式构成不定式短语作主语。疑问词包括疑问代词wh、whm、what、which、whse以及疑问副词when、where和hw。此外连接词whether也适用。此时，疑问词 + t d 结构可以转化为一个________，例如：Hw t use the cmputer is a questin. = ___________________________________________
Hw we can use the cmputer is a questin.
Observatin 8
动名词作主语表示_______________的行为;不定式作主语表示 _______________________动作。
Further thinking
1. ______ (d) mrning exercises regularly is gd fr yur health. 2. It feels really gd ______ (d) mrning exercises tday.
具体的、一次性的或将来的
Cmplete the fllwing sentences and cmpare their usages.
1. Hw lng des it take fr yu _______ (get) there by bike? 2. Hw much did it cst yu _______ (send) the package t Beijing?3. It’s imprtant _______ yu t walk after supper. 4. It’s very rude ______ yu t turn yur back t yur teacher and refuse t answer.
在空白处填入1个适当的单词或括号内单词的正确形式。
5. T make friends with these naughty bys _______ (be) nice.  6. When ______ (hld) the meeting has nt been discussed yet.7. It seemed a pity _____________ (waste) s much time n the task withut achieving ur gal.8. T change r ____________ (change) is a questin we have t think abut every day.
t have wasted
t be changed
1. 明天是否下雨，无关紧要。 2. 车不用时，及时锁好很有必要。 3. 这个老人对蛇的怜悯导致了他的死亡。
It desn’t matter whether t rain r nt tmrrw.
It is necessary t lck yur car in time when nt using it.
The ld man’s taking pity n the snake leads t his death.
Fr the ld man t take pity n the snake leads t his death.
4. 减少工业污染，清洁水质，花费了多年工作才完成。5. 对于像这样的一家公司，雇用安保人员是标准做法。
It tk years f wrk t reduce the industrial pllutin and clean the water.
It’s standard practice fr a cmpany like this ne t emply a security fficer.
在空白处填入1个适当的单词或括号内单词的正确形式。I had a variety f hbbies ____________ I studied in cllege. It was hard fr me ______ (save) much mney t keep my hbbies and it was als flish ____ me t spend plenty f time n thse because it has been my dream _____ (be) a dctr. Hwever, t becme a dctr requires much study and it was a pity fr me ________ (leave) behind because I ___________ (waste) t much time keeping my unwise hbbies.
when / while
had wasted
Frtunately I met my dear teacher, Miss Liu, wh really changed my life curse. After _________ (realize) my mistakes, I decided t make up fr the lst time. _______ (study) hard became my first task then ______ t get up early every day turned t be my habit. _____ tk me tw terms t catch up with my classmates finally.