Unit 2 Discovering Useful Structures P17新人教版 选择性必修三

新人教选择性必修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宾语补足语subject主语adverbial状语predicative表语attribute定语Listthefunctionsoftheinfinitivesinthesentences.动词不定式

动词不定式作主语

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。Toseeistobelieve.Itisrighttogiveupsmoking.It'sveryniceofyoutobesoconsiderate.1.不定式具有名词的特征，可在句子中充当主语。

Toknowoneselfisdifficult.

人贵有自知之明。

动词不定式作主语

不定式和动名词作主语的区别不定式：表示具体的某次动作，特别是将来的动作。

Toteachyoutheusesoftheinfinitiveismyjobtoday.

教你们不定式的用法是我今天的工作。动词-ing形式：表示比较抽象的、经常性的、一般性动作。

Teachingismyjob.

教学是我的工作。

动词不定式作主语

2.不定式和when/where/how/what/whether等连用，在句子中作主语。Whethertodoit

hasn'tbeendecided.是否去做还没有决定。Itis+形容词+forsb.+todosth.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。It'sveryhardforhimtostudytwolanguages.对他来说学两门语言是很难的。3.it作形式主语句型：

动词不定式作主语

Itis+形容词+ofsb.+todosth.的句型一般用表示人物的性格、品质，表示主观感情或态度的形容词，如good,kind,nice,clever,foolish,right等。It'sveryniceofyoutohelpme.你来帮助我，真是太好了。Itis+a/an+名词+todosth.这样的名词有：apity,ashame,apleasure,one'sduty,anhonor等。It'sagreathonortobeinvitedtoyourbirthdayparty.很荣幸被邀请参加你的生日聚会。

动词不定式作主语

Ittakes/costs/requires/makessb./sth.todosth.Ittookmetwohourstofinishthework.我完成那项工作用了两小时。注意：在Itis+nouse/nogood/useless/fun/enjoyable/tiring/interesting/foolish/nice/awasteoftime/apleasure...句型中常用动名词形式做真正的主语。It'snousewaitingheredoingnothing.无所事事地等待是没有用的。（1）Sometimesit’sbetter

___(remain)

silent.（2）Although

isahardtasktoprotectourenvironment,wecan’thelpbutgoahead.

（3）

______

(control)theairpollutionisnecessary.（4）Itwasfoolish

himtoendangerhislifeinthatway.（5）Don’tyouthinkitisrude

himtoaskaladyherage?Practice语法填空：根据提示完成句子。ofofitTocontrol/Controllingtoremain（6）Itisdifficult

himtoliveonsuchasmallsalary.（7）Idon’tthink_________________________

（你问……是不礼貌的）howlongtheinterviewwilllast.（8）

_____

（保卫……是我们的职责）thecountryagainstitsenemies.（9）

___

（……花了我半个小时）towashtheclothes.Practice语法填空：根据提示完成句子。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