高中英语人教版 (2019)选择性必修 第三册Unit 2 Healthy Lifestyle教课内容课件ppt

这是一份高中英语人教版 (2019)选择性必修 第三册Unit 2 Healthy Lifestyle教课内容课件ppt，共31页。PPT课件主要包含了Lead-in，practice，production，to do 作主语， to do，疑问词，不定式作主语用法①，补充主谓一致，不定式作主语用法②，Reading等内容，欢迎下载使用。
Presentatin
Part 1 Lead-in
Wrds review
1.rely n 依赖；依靠； reliable adj.可信赖的；2.straight away 立即，马上3.pessimistic 悲观的 ptimistic 乐观的4.arrive at/cme t/reach a decisin作出决定5. make up ne’s mind t d sth.下定决心做某事 bear/keep sth. in mind 牢记某事6.be cmpse f 由组成7. in respnse t答复；回答8. decide n 决定；选定
Pay attentin t the sentences
It is difficult fr me t get up early.
It is kind f yu t help me!
T get up early is difficult fr me .
T help me is kind f yu !
1. T change bad habits is never easy2.T change r t be changed is a questin we have t think abut every day. 3.When and hw t g there has nt been decided yet.
作主语的是动词不定式，谓语动词用单数.
Think: 系动词前的habits为复数, 为何谓语动词用is？
1.T prevent harmful habits like these frm dminating a teenager’s life is change bad habits is never easy, even with many , during this perid, it can be easy fr sme f them t frm bad all, it is nt easy t break bad t g there has nt been decided yet.【总结】1.1-4句子中动词不定式都是作___语。2.句3和句4中it作______，真正主语是后面的_______。3.句5中是______ +不定式作主语
Part 2presentatin
直接放在________作主语；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；和_________构成“疑问词+t d”短语作主语。
动词不定式作主语用法有三个：
1. T clean the windw is tday’s jb.2. T jump ut f the windw is dangerus.3. T finish the wrk befre Friday is nt s easy.
一、不定式直接放在句首作主语
以上句子中动词不定式（短语）在句中直接作_______ (成分)。 注意1：谓语动词采用__________ 形式。 注意2：不定式做主语与动名词做主语的区别一般来说，不定式做主语，表示具体的、一次性的或将来的动作；动名词做主语，表示一般的、泛指的或习惯性的行为。但是在多数情况下无明显区别。如T see is t believe.=Seeing is believing. 练习： ①　________(teach) English is my jb. ②　________(teach) yu English this term is my jb.　 ③ T say is ne thing and ________(d) is anther. ④ T change bad habits ________(be) never easy, even with many attempts.
单个不定式作主语，谓语动词用_______两个或两个以上的不定式作主语，若语意一致或作为一个整体，谓语动词用_________两个或两个以上的不定式作主语，若语意不一致，谓语动词用________
二、it 作形式主语放在句首，后面的不定式作真正的主语
1. It is interesting t play with snw in winter.2. It’s imprtant fr us t keep the water clean.3. It’s very kind f yu t help me.4. It must be great fun t fly t the mn in a spaceship.5. It tk me mre than an hur t d my hmewrk yesterday evening.6. It appears unlikely t cme back in half an hur.
以上5个句子中动词不定式在句中均作______成分。①It is pssible ________ (walk) r bike the entire 14 kilmeters.②She admits ______ tk her a while t cme arund t the pinin.③It is a great fun ______ him t leave fr the ther city t wrk.④It seemed selfish ______ him nt t share his dictinary with thers.
1. It is+adj.+fr/f sb +t d sth若adj. ”描述人的品格、特点”, 用f,如 kind，plite，implite， rude，flish;若adj.“描述事或行为的特征”, 用fr,如difficult, pssible，necessary
归纳：it作形式主语常见句型
It is stupid _______them t quarrel abut this questin.It is easy _______ me t learn hw t drive.It is implite ______ him t say s.It is imprtant _______ us t express ur pinins.It is clever ______ him t leave that cmpany.
2. It is+名词(a pleasure/a pity/an hnur...) (fr sb)+ t d is an hnur t give a speech in behalf f my schl.It is a pity t miss the chance t see yur shw.
3. It takes/tk/will take sb. sme time/mney t d 做某事花费某人多长时间/钱 tk me mre than an hur t d my hmewrk yesterday evening.
归纳：为保持句子平衡，用it来作形式主语,相关句型有：①It is/was＋形容词＋(fr/f sb)＋动词不定式形容词修饰动词不定式这件事时，此时常用介词fr。形容词修饰表不定式的逻辑主语时，则用介词f。②It is＋a/an＋名词(如a pity/an hnur ...)＋t d ...③It takes/csts/requires ... sb/sth t d sth
1. 浪费时间做某事: It is a waste f time ding sth2. 做某事是没有用的It's n use/n gd ding sthIt's useless ding sthIt is fun/n fun ding sth
复习：it作形式主语ding作真正的主语
_____________(cmplete) tday’s hmewrk is a little bit difficult fr me. 比较 ____________ (read) is my hbby, which nearly takes up all my spare time.
三、“特殊疑问词+不定式”作主语
1. Hw t use the cmputer is a questin.2. Where t g has nt been decided.3. When t start hasn’t been decided yet.4. Whether t drive r take a taxi is still a questin.
以上例句谓语动词都是用的________ 形式。①Where and when __________ (cast) a net is mre imprtant than hw t cast a net.②Whether t cmpete in the relay race _______ (be) a decisin that has t be made by ur teacher.③Hw the wrk shuld be finished is still a questin.= Hw ___________ the wrk is still a questin.
归纳 不定式作主语，有时根据表达的需要，可以在添加疑问代词或副词，疑问代词：wh，whm，what，which 疑问副词：when，where，hw whether疑问词+t d可作主语,相当于一个主语从句。疑问词包括疑问副词when、where和hw及疑问代词wh(m)、what、which、whse。连接词whether也适用。
Part 3Practice
1._______ (lk) after the safety f the cmmunity is his _______ (cure) this kind f illness is still seemed selfish f him _________________________．他不给员工任何东西，这显得他太自私了。4.It seems a pity __________________拒绝这邀请似乎是遗憾的5.It's unwise ______________________________．他们拒绝(采纳)这个建议是不明智的。1.It tk us abut tw hurs______ (get) there that is n use _______(argue) with him，fr he is s stubbrn.3.解决这个具有挑战性的问题非常难。①______________________________________________(动词不定式作主语)②______________________________________________.(it作形式主语)
nt t give his emplyees anything
t refuse the invitatin
f them t turn dwn the prpsal
T slve the challenging prblem is quite difficult.
It is quite difficult t slve the challenging prblem.
1.It’s a great hnur ____________ t Mary’s birthday party.被邀请参加玛丽的生日派对是一件很荣幸的事情。2.It is difficult fr us______________________________ 我们难以在15分钟内写完这篇作文。3.It is stupid f yu_______________________________ 你把老师说的所有都记下来是愚蠢的。4. _______________，and it is hard wrk that can change yur present terrible situatin.哭没有用，而且只有努力才能改变你现在糟糕的处境。5.It is a great hnur fr me __________________________ n hw t get alng well with yur parents.我很荣幸与你分享如何与你父母和睦相处的观点。
t be invited
t finish writing the cmpsitin in a quarter f an hur
t write dwn everything the teacher says
It is n use crying
t share with yu my pinins
1. ______ tk us a lng time t repair the huse.2. It is flish _____ yu t turn dwn the prpsal(提议).3. It is imprtant ______ her t prepare fr the examinatin.4. When yu are in truble, it is _______ (help) t turn t yur teacher.5. T frm a gd habit _______ (be) difficult while t fall int a bad habit is easy.6. Whether _________ (hld) a party this weekend hasn’t been knwn yet.
（1）Smetimes it’s better 　　　　 　（remain） silent. （2）Althugh 　　　　 　 is a hard task t prtect ur envirnment，we can’t help but g ahead. （3） 　　　 　 　（cntrl） the air pllutin is necessary. （4）It was flish 　　　 him t endanger his life in that way. （5）Dn’t yu think it is rude 　　　 him t ask a lady her age? （6）It is difficult 　　　　 　 him t live n such a small salary.
T cntrl/Cntrlling
T make friends with these naughty bys _______ (be) nice.When ______ (hld) the meeting has nt been discussed yet. It seemed a pity _____________ (waste) s much time n the task withut achieving ur gal.T change r ____________ (change) is a questin we have t think abut every day.
t have wasted
t be changed
Hw lng des it take fr yu _______ (get) there by bike?Hw much did it cst yu _______ (send) the package t Beijing?It’s imprtant _______ yu t walk after supper. It’s very rude ______ yu t turn yur back t yur teacher and refuse t answer.
Part 4Prductin
1. imprtant / avid / passive cigarette smking
It is imprtant t avid passive cigarette smking.
will take / nutritin specialist / a balanced diet menu / make / an hur / fr yu
________________________________________________________________________________
It will take an hur fr a nutritin specialist t make a balanced diet menu fr yu.
useful / turn t / fitness cnsultant / fr advice
illegal / dangerus / take / drugs
harmful / skip breakfast / ften
It is harmful t skip breakfast (t) ften.
It is useful t turn t a fitness cnsultant fr advice.
It is dangerus t take illegal drugs.
t d 作主语位于句首，位于谓语之前
t d 作主语位于谓语之后，it作形式主语
疑问词+t d 构成不定式短语，作主语
T read withut reflecting is like eating withut digesting.
It takes sb. time/mney t d sth.
It is + adj. + （fr/f sb.） t d sth.
It is + n. + (fr sb.) t d sth.
与疑问词wh, whm, whse, what, which, when, where, hw等连用