Unit 4 重點句型導學案- 高中英語人教新課標必修三

新人教英語必修三unit4導學案（三）課前鞏固一、根據(jù)中文或首字母提示，填寫所缺單詞的適當形式。1.Thereisafriendlya________ofhelpingeachotherwithdifficultiesinstudyinourclass.2.Itispossibleto________(繁殖)thesebacteriainthelaboratory.3.Bythetimetheyreachedthetopofthemountaintheyweree________.4.Thereisabigundergroundrailway________(系統(tǒng))inLondon,whichisgoodfortravellers.5.Thereisav________windoutsideandthesnowissoheavy.6.Toworkoutthisproblem,wehavetriedmanym________.7.Asamiddleschoolstudent,youmayfindyouaregrowingup________(漸漸地).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、請從下面方框中選擇適當?shù)膯卧~或短語，并用其正確形式填空。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:單詞拼寫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選詞填空1.coolingdown 2.present 3.getthehangof4.cheeredup5.dependson 6.Nowthat 7.brokeout 8.spread9.exists 10.exploding 11.prevent;ime經(jīng)典原句默寫與背誦1．Whatitwastobecomewasuncertainuntilbetween4.5and3.8billionyearsagowhenthedustsettledintoasolidglobe.隨后它會變成什么沒有人知道，直到45～38億年前，這團塵埃才慢慢地形成一個固體的球狀物。2．Thisproducesachainreaction，whichmadeitpossibleforlifetodevelop.這產(chǎn)生了連鎖反應，使得生命的發(fā)展成為可能。3．ButwhenItriedtostepforward，IfoundIwascarriedtwiceasfarasontheearthandfellover.但是當我試著向前邁步時，我發(fā)覺我被送出去很遠，步子的跨度竟是在地球上的兩倍，并且摔倒在地。4．...walkingdoesneedabitofpracticenowthatgravityhaschanged.……既然重力改變了，看來走路也的確需要練一練了。重點句型詳解1Theywereintimetoproducecarbon，nitrogen，watervapourandothergases，whichweretomaketheearth’satmosphere.最終產(chǎn)生了碳、氮氣、水蒸氣和其他多種氣體，從而形成了地球的大氣層。eq\x(句型公式：betodo)betodo有五層意義：(1)表示預定，“預定”，相當于begoingtodo。(2)表示義務，“應該”，相當于should。(3)表示可能，“會做”，相當于can/could。(4)表示命運，“注定”(通常用于過去時，描述過去的事實)。(5)用于if...weretodo，引導對將來的虛擬語氣。HeistoreturnfromGermanytomorrow.他明天將從德國回來。Youaretobebackby9o’clock.你要在9點以前回家。完成句子(1)Whenareyoutoleaveforhome?你什么時候回家？(2)Sheistobemarriednextmonth.她將于下個月結(jié)婚。(3)Youaretoreporttothepolice.你應該報警。2...IfoundIwascarriedtwiceasfarasontheearthandfellover.……當我向前邁步的時候我發(fā)現(xiàn)我所走的距離是在地球上的兩倍，并且跌倒了。eq\x(句型公式：倍數(shù)表達法)倍數(shù)的表達方式：

1倍數(shù)＋as...as...2倍數(shù)＋比較級＋than3倍數(shù)＋thesize/height/length/width...＋of...4倍數(shù)＋what從句5倍數(shù)＋thatof...Beijingistentimesthesizeofmyhometown.北京是我家鄉(xiāng)的十倍大。Inourcountynowthegrainoutputissixtimesthatofbeforeliberation.現(xiàn)在我們縣的糧食產(chǎn)量相當于解放前的六倍。夯實基礎同義句改寫Theredruleristhreetimesaslongastheyellowone.(1)Theredruleristwotimeslongerthantheyellowone.(用“倍數(shù)＋比較級”改寫句子)(2)Theredruleristhreetimesthelengthoftheyellowone.(用“倍數(shù)＋the＋n.＋of...”改寫句子)3“Ohdear，”Icried，“walkingdoesneedabitofpracticenowthatgravityhaschanged.”我大聲地說：“天啊，既然重力改變了，走路也需要練一練了?！眅q\x(句型公式：nowthat引導原因狀語從句)nowthat既然，由于，是連詞詞組，引導原因狀語從句，表示明顯的原因或既成的事實。口語中that?？墒÷?。其他表示原因的連詞或介詞短語：because因為語氣較重，常用于回答why的疑問,since因為；既然可與nowthat互換as因為語氣較弱for因為并列連詞，引導一個分句，不能置于句首，表示進一步補充說明dueto，becauseof，onaccountof，owingto，thanksto，asaresultof等Nowthatthechildrenknow，wecantelleveryoneelse.既然孩子們知道了，我們就可以告訴其他人了。夯實基礎用適當?shù)倪B詞填空(1)Nowthatyou’rehere，whynothaveadrink?(2)SinceitislateIshallgohomenow.(3)Theschoolwasmovedoutofdowntownasthenumberofstudentshadgrowntoolarge.(4)Itmusthaverainedlastnight，forthegroundiswet.4、Thisproducedachainreaction，whichmadeitpossibleforlifetodevelop．這就產(chǎn)生了一系列的反應，使得生命就有可能開始發(fā)展了?！疽c提煉】it作形式賓語。句中madeitpossibleforlifetodevelop屬于“v.(動詞)＋it＋adj./n.(賓補)＋todo/that從句”結(jié)構。該結(jié)構中，it作形式賓語，真正的賓語是后面的不定式或that從句。常用于此結(jié)構中的動詞還有：think，believe，find，consider，feel等。①Ifindithardtoremember(remember)thesewordsinashorttime.我發(fā)現(xiàn)在短時間內(nèi)記住這些詞很難。②ImustmakeitclearthatI'llalwayssupportyou.我必須說清楚我會一直支持你。③Ithinkitusefultodrinksomehotmilkbeforesleep.我認為睡前喝點熱牛奶有作用。5、Whenwegetclosertothemoon，weshallfeelitsgravitypullingus，butitwillnotbeasstrongapullastheearth's．當我們更接近月球時，就會感到月球的引力在拉我們。但是，月球的引力不像地球的引力那么大。asstrongapullastheearth's屬于“as＋adj.＋a/an＋n.＋as”結(jié)構，意為“像……一樣的……”，其中的名詞必須是可數(shù)名詞的單數(shù)形式，此結(jié)構用于否定句中可用“notso/as...as...”結(jié)構。as...as...結(jié)構的具體形式有：as/so＋形容詞＋a/an＋可數(shù)名詞單數(shù)＋as...像……一樣的……as/so＋形容詞/副詞原級＋as...像……一樣……①Heissocleveraboyaseveryonelikes.他是一個人人都喜歡的聰明孩子。②Hisbedroomisnotas/soneatashiseldersister's.他的臥室沒有他姐姐的整潔。③You'vemadeasmanymistakesasIhave.你犯的錯誤和我犯的一樣多。課后小練課文縮寫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.沒有人確切知道地球是怎樣形成的，因為在很早以前它就形成了。2．Theearthbecamesoviolentthat________________________________theshapewouldlastornot.地球變得激烈動蕩，不知道這個固體形狀是否會繼續(xù)存在下去。3．Itwasnotimmediatelyobviousthatwater________________________thedevelopmentoflife.水對生命的發(fā)展會起關鍵作用，這一點在當時并不明顯。4．__________________