Unit 4 重点句型导学案- 高中英语人教新课标必修三

新人教英语必修三unit4导学案（三）课前巩固一、根据中文或首字母提示，填写所缺单词的适当形式。1.Thereisafriendlya________ofhelpingeachotherwithdifficultiesinstudyinourclass.2.Itispossibleto________(繁殖)thesebacteriainthelaboratory.3.Bythetimetheyreachedthetopofthemountaintheyweree________.4.Thereisabigundergroundrailway________(系统)inLondon,whichisgoodfortravellers.5.Thereisav________windoutsideandthesnowissoheavy.6.Toworkoutthisproblem,wehavetriedmanym________.7.Asamiddleschoolstudent,youmayfindyouaregrowingup________(渐渐地).8.Oceanscovertwothirdsofthes________oftheearthwhilelandcoversonethirdofit.9.Theearthisoneoftheninep________whichgoaroundthesun.10.Water________(存在)inthreeforms,whichareliquid,gasandsolid.11.Withthed________ofeconomy,people’slivingstandardisbetterandbetternow.12.Knowingthathefailedtopasstheexam,hefeltveryd________andunhappy.13.Thewastegasfromthefactoryish________toourhealth.14.LiBaiwasoneofthegreatestpoets,whileZhangHengwasoneofthemostfamousChinesea________intheworld.15.Itisthethirdtimethathisnovelwasp________inthiscompany.二、请从下面方框中选择适当的单词或短语，并用其正确形式填空。intime,prevent…from,dependon,cheerup,nowthat,breakoutcooldown,getthehangof,spread,presence,explode,exist1.Thecoffeeis________,soyou’dbetterdrinkitrightnow,oritwillbetoocoldforyou.2.Beforeorderingroomsforthem,you’dbettermakesurehowmanypeoplewillbe________atthemeeting.3.Wemusttryto________thenewtelephonesystembeforeweuseitsothatwemayuseitfreely.4.Hewasunhappyatfirstbutsoon________afterlunch.5.TheSunisveryimportanttothemankind.Man________itforheatandlight.6.Youneedn’tworktoday.________youareill,youmayhavearestathome.7.TheFirstWorldWar________in1914andendedin1918.8.Ifbirdswanttofly,theyhaveto________theirwingsandwavethemupanddown.9.ExplorershavebeensenttoMarstomakesurewhetherlife________onit.10.OnNewYear’sEvewemayhearfireworks________hereandthere.Wedon’tthinkitnoisybutexciting.11.Imissmyhometownsomuchthatnothingcan________me________goingback.12.Ifwedon’thurryup,wewon’tbe________tocatchtheairplane.Keys:单词拼写1.atmosphere 2.multiply 3.exhausted 4.system 5.violent6.methods 7.gradually 8.surface 9.planets 10.exists11.development 12.disappointed 13.harmful 14.astronomers 15.published选词填空1.coolingdown 2.present 3.getthehangof4.cheeredup5.dependson 6.Nowthat 7.brokeout 8.spread9.exists 10.exploding 11.prevent;ime经典原句默写与背诵1．Whatitwastobecomewasuncertainuntilbetween4.5and3.8billionyearsagowhenthedustsettledintoasolidglobe.随后它会变成什么没有人知道，直到45～38亿年前，这团尘埃才慢慢地形成一个固体的球状物。2．Thisproducesachainreaction，whichmadeitpossibleforlifetodevelop.这产生了连锁反应，使得生命的发展成为可能。3．ButwhenItriedtostepforward，IfoundIwascarriedtwiceasfarasontheearthandfellover.但是当我试着向前迈步时，我发觉我被送出去很远，步子的跨度竟是在地球上的两倍，并且摔倒在地。4．...walkingdoesneedabitofpracticenowthatgravityhaschanged.……既然重力改变了，看来走路也的确需要练一练了。重点句型详解1Theywereintimetoproducecarbon，nitrogen，watervapourandothergases，whichweretomaketheearth’satmosphere.最终产生了碳、氮气、水蒸气和其他多种气体，从而形成了地球的大气层。eq\x(句型公式：betodo)betodo有五层意义：(1)表示预定，“预定”，相当于begoingtodo。(2)表示义务，“应该”，相当于should。(3)表示可能，“会做”，相当于can/could。(4)表示命运，“注定”(通常用于过去时，描述过去的事实)。(5)用于if...weretodo，引导对将来的虚拟语气。HeistoreturnfromGermanytomorrow.他明天将从德国回来。Youaretobebackby9o’clock.你要在9点以前回家。完成句子(1)Whenareyoutoleaveforhome?你什么时候回家？(2)Sheistobemarriednextmonth.她将于下个月结婚。(3)Youaretoreporttothepolice.你应该报警。2...IfoundIwascarriedtwiceasfarasontheearthandfellover.……当我向前迈步的时候我发现我所走的距离是在地球上的两倍，并且跌倒了。eq\x(句型公式：倍数表达法)倍数的表达方式：

1倍数＋as...as...2倍数＋比较级＋than3倍数＋thesize/height/length/width...＋of...4倍数＋what从句5倍数＋thatof...Beijingistentimesthesizeofmyhometown.北京是我家乡的十倍大。Inourcountynowthegrainoutputissixtimesthatofbeforeliberation.现在我们县的粮食产量相当于解放前的六倍。夯实基础同义句改写Theredruleristhreetimesaslongastheyellowone.(1)Theredruleristwotimeslongerthantheyellowone.(用“倍数＋比较级”改写句子)(2)Theredruleristhreetimesthelengthoftheyellowone.(用“倍数＋the＋n.＋of...”改写句子)3“Ohdear，”Icried，“walkingdoesneedabitofpracticenowthatgravityhaschanged.”我大声地说：“天啊，既然重力改变了，走路也需要练一练了。”eq\x(句型公式：nowthat引导原因状语从句)nowthat既然，由于，是连词词组，引导原因状语从句，表示明显的原因或既成的事实。口语中that常可省略。其他表示原因的连词或介词短语：because因为语气较重，常用于回答why的疑问,since因为；既然可与nowthat互换as因为语气较弱for因为并列连词，引导一个分句，不能置于句首，表示进一步补充说明dueto，becauseof，onaccountof，owingto，thanksto，asaresultof等Nowthatthechildrenknow，wecantelleveryoneelse.既然孩子们知道了，我们就可以告诉其他人了。夯实基础用适当的连词填空(1)Nowthatyou’rehere，whynothaveadrink?(2)SinceitislateIshallgohomenow.(3)Theschoolwasmovedoutofdowntownasthenumberofstudentshadgrowntoolarge.(4)Itmusthaverainedlastnight，forthegroundiswet.4、Thisproducedachainreaction，whichmadeitpossibleforlifetodevelop．这就产生了一系列的反应，使得生命就有可能开始发展了。【要点提炼】it作形式宾语。句中madeitpossibleforlifetodevelop属于“v.(动词)＋it＋adj./n.(宾补)＋todo/that从句”结构。该结构中，it作形式宾语，真正的宾语是后面的不定式或that从句。常用于此结构中的动词还有：think，believe，find，consider，feel等。①Ifindithardtoremember(remember)thesewordsinashorttime.我发现在短时间内记住这些词很难。②ImustmakeitclearthatI'llalwayssupportyou.我必须说清楚我会一直支持你。③Ithinkitusefultodrinksomehotmilkbeforesleep.我认为睡前喝点热牛奶有作用。5、Whenwegetclosertothemoon，weshallfeelitsgravitypullingus，butitwillnotbeasstrongapullastheearth's．当我们更接近月球时，就会感到月球的引力在拉我们。但是，月球的引力不像地球的引力那么大。asstrongapullastheearth's属于“as＋adj.＋a/an＋n.＋as”结构，意为“像……一样的……”，其中的名词必须是可数名词的单数形式，此结构用于否定句中可用“notso/as...as...”结构。as...as...结构的具体形式有：as/so＋形容词＋a/an＋可数名词单数＋as...像……一样的……as/so＋形容词/副词原级＋as...像……一样……①Heissocleveraboyaseveryonelikes.他是一个人人都喜欢的聪明孩子。②Hisbedroomisnotas/soneatashiseldersister's.他的卧室没有他姐姐的整洁。③You'vemadeasmanymistakesasIhave.你犯的错误和我犯的一样多。课后小练课文缩写Theearthwasjustacloudofenergeticdustafterthe“BigBang”．Thenthedust1.________intoasolidglobemovingaroundthesun.Theearth2.________loudlywithfireandrock，tobe3.________toproducemanythings，whichmadetheearth’satmosphere.Waterstayedontheearthandpeoplethinkitisimportantforthebeginningoflife.Itallowedtheearthtodissolve4.________gases.Thenlifebegantodevelop.Plantswerethestartofchanges.They5.________andfilledtheoceansandseaswithoxygen.Thisencouragedthe6.________ofearlyshellfishandfish.Landanimalssuchasinsects，reptilesanddinosaursandsoonappearedafterthefirstgreenplantsappeared.Smallcleveranimals7.________allovertheearth.Buttheyarenot8.________________theearthverywell.Toomuchcarbondioxideisputintotheatmosphere，which9.________heatfromescapingfromtheearthintospace.Whetherlifewillcontinue10.________________whetherthisproblemcanbesolved.完成句子1．Nooneknowsexactly________________________________，asithappenedsolongago.没有人确切知道地球是怎样形成的，因为在很早以前它就形成了。2．Theearthbecamesoviolentthat________________________________theshapewouldlastornot.地球变得激烈动荡，不知道这个固体形状是否会继续存在下去。3．Itwasnotimmediatelyobviousthatwater________________________thedevelopmentoflife.水对生命的发展会起关键作用，这一点在当时并不明显。4．__________________