Unit 2 Discovering Useful Structures P17新人教版 選擇性必修三

新人教選擇性必修Book3

Unit2HealthyLifestyleDiscoverusefulstructures

P17

Underlinethesentencesinthetext.However,duringthisperiod,itcanbeeasyforsomeofthemtoformbadhabits.Topreventharmfulhabitslikethesefromdominatingateenager'slifeisessential.Theymustlearntorecognisebadhabitsearlyandmakeappropriatechanges.Tochangebadhabitsisnevereasy,evenwithmanyattempts.Wemakeachoicetodosomething,andthenwerepeatitoverandoveragain.Lead-inSoonthatchoicebecomesautomaticandformsahabitthatismuchhardertochange.Firstly,thereisa“cue”,anaction,event,orsituationthatactsasasignaltodosomething.Therewardmakesusmuchmorelikelytocontinuethecycle,...Tofacilitateapositivechangeinourbadhabits,wemustfirstexamineourbadhabitcyclesandthentrytoadaptthem.Forexample,wecouldtrytoreplaceanegativeroutinewithsomethingmorepositive.Asidefromchangingbadhabits,wecanalsousethehabitcycletocreategoodhabits.Youhavethepowertobuildahappyandhealthylife

ofgoodhabits.

Lead-in

Forexample,whenwecometoanescalator,ournormalroutineistorideit,butwecouldchangethisroutineintosomethingmorepositivebytakingthestairsinstead.Manyofustrytochangebadhabitsquickly,andifwearenotsuccessfulstraightaway,weoftenbecomepessimisticandgiveup.Infact,themostsuccessfulwaytochangeisnotsuddenly,butoveraperiodoftime.Toreachthegoalofchange,apersonmustshowsomedisciplineandrepeatedlytakemanysmallsteps.Afterall,itisnoteasytobreakbadhabits.Foryoungpeople,thereisplentyoftimetochangebadhabits.Findmoreintherestofthetext.Lead-inPresentation/PracticeMymumkeepstellingmetogooutwithmyschoolfriendsinstead.It'simportanttomeetfriendsinpersonfromtimetotime,notjustonsocialmedia.WhenIsetouttodosomething,Idomybesttoachieveit.Mytargetistopreparemyselfformydegreeinbiologyatuniversity.LiYingisthefirstpersontojointhevolunteeringclubinherclass.complement賓語(yǔ)補(bǔ)足語(yǔ)subject主語(yǔ)adverbial狀語(yǔ)predicative表語(yǔ)attribute定語(yǔ)Listthefunctionsoftheinfinitivesinthesentences.動(dòng)詞不定式

動(dòng)詞不定式作主語(yǔ)

不定式作主語(yǔ)，表示具體的、一次性的或?qū)?lái)的動(dòng)作；在很多情況下，人們通常用it作為形式上的主語(yǔ)，而把不定式移到謂語(yǔ)之后，使句子結(jié)構(gòu)顯得平穩(wěn)一些。Toseeistobelieve.Itisrighttogiveupsmoking.It'sveryniceofyoutobesoconsiderate.1.不定式具有名詞的特征，可在句子中充當(dāng)主語(yǔ)。

Toknowoneselfisdifficult.

人貴有自知之明。

動(dòng)詞不定式作主語(yǔ)

不定式和動(dòng)名詞作主語(yǔ)的區(qū)別不定式：表示具體的某次動(dòng)作，特別是將來(lái)的動(dòng)作。

Toteachyoutheusesoftheinfinitiveismyjobtoday.

教你們不定式的用法是我今天的工作。動(dòng)詞-ing形式：表示比較抽象的、經(jīng)常性的、一般性動(dòng)作。

Teachingismyjob.

教學(xué)是我的工作。

動(dòng)詞不定式作主語(yǔ)

2.不定式和when/where/how/what/whether等連用，在句子中作主語(yǔ)。Whethertodoit

hasn'tbeendecided.是否去做還沒(méi)有決定。Itis+形容詞+forsb.+todosth.常用于表示事物的特征特點(diǎn)，表示客觀形式的形容詞，如easy,hard,difficult,interesting,impossible等。It'sveryhardforhimtostudytwolanguages.對(duì)他來(lái)說(shuō)學(xué)兩門(mén)語(yǔ)言是很難的。3.it作形式主語(yǔ)句型：

動(dòng)詞不定式作主語(yǔ)

Itis+形容詞+ofsb.+todosth.的句型一般用表示人物的性格、品質(zhì)，表示主觀感情或態(tài)度的形容詞，如good,kind,nice,clever,foolish,right等。It'sveryniceofyoutohelpme.你來(lái)幫助我，真是太好了。Itis+a/an+名詞+todosth.這樣的名詞有：apity,ashame,apleasure,one'sduty,anhonor等。It'sagreathonortobeinvitedtoyourbirthdayparty.很榮幸被邀請(qǐng)參加你的生日聚會(huì)。

動(dòng)詞不定式作主語(yǔ)

Ittakes/costs/requires/makessb./sth.todosth.Ittookmetwohourstofinishthework.我完成那項(xiàng)工作用了兩小時(shí)。注意：在Itis+nouse/nogood/useless/fun/enjoyable/tiring/interesting/foolish/nice/awasteoftime/apleasure...句型中常用動(dòng)名詞形式做真正的主語(yǔ)。It'snousewaitingheredoingnothing.無(wú)所事事地等待是沒(méi)有用的。（1）Sometimesit’sbetter

___(remain)

silent.（2）Although

isahardtasktoprotectourenvironment,wecan’thelpbutgoahead.

（3）

______

(control)theairpollutionisnecessary.（4）Itwasfoolish

himtoendangerhislifeinthatway.（5）Don’tyouthinkitisrude

himtoaskaladyherage?Practice語(yǔ)法填空：根據(jù)提示完成句子。ofofitTocontrol/Controllingtoremain（6）Itisdifficult

himtoliveonsuchasmallsalary.（7）Idon’tthink_________________________

（你問(wèn)……是不禮貌的）howlongtheinterviewwilllast.（8）

_____

（保衛(wèi)……是我們的職責(zé)）thecountryagainstitsenemies.（9）

___

（……花了我半個(gè)小時(shí)）towashtheclothes.Practice語(yǔ)法填空：根據(jù)提示完成句子。foritisimpoliteofyoutoaskIt’sourdutytodefendIttookmehalfanhour ProductionJointhewordstomakefullsentencesusingtheinfinitive.1.important/avoid/passivecigarettesmoking._____________________________________________2.willtake/nutritionspecialist/abalanceddietmenu/make/anhour/foryou.__________________________________________________________________________________________3.useful/turnto/fitnessconsultant/foradvice_____________________________________________4.illegal/dangerous/take/drugs_____________________________________________5.harmful/skipbreakfast/often_________________________________________2Itisimportanttoavoidpassivecigarettesmoking.Itwilltakeanhourforanutritionspecialisttomakeabalanceddietmenuforyou.Itisusefultoturntoafitnessconsulantforadvice.Itisdangeroustotakeillegaldrugs.Itisharmfultoskipbreakfast(too)often.Completetheconversationswiththecorrectformsofthephrasesinthebox.31.A:Hello,doctor.Iwanttoloseweight,butIjustcan’tseemtodoit.Whatcanyoudotohelpme?B:Well,first,it’snecessaryto______________whatyoueat.Cutoutallfattyfoodandsugarydrinks,andeatmorefruitandvegetables.2.A:Ireallyneedto_________awaytoexercisemore.Icoulduseafitnessapp,butmyphone’sfull.B:Sodeleteafewfiles.I'msuretheappdoesn’ttakeupmuchspace.beginwithbeincontrolofmakeachoicedecideonmake