Unit9ForcesofNatureLesson5GrammarinUse课件仁爱科普版英语八年级下册

Unit9ForcesofNatureGrammarinUse★学习目标：•认识合成词，能根据构词猜词义。•掌握副词比较级和最高级的用法知识点。•了解沙尘暴、飓风危害，增强防灾安全意识。GrammarinUseCompoundwordsstorm+snowsnowstorm(n.)风暴;暴风雨(n.)暴风雪Asnowstormisastormwithstrongwindsandalotofsnow.(n.)雪;雪花GrammarinUseCompoundwordsthunder+stormthunderstorm(n.)雷;雷声(n.)雷暴Athunderstormisastormwiththunderandlightning.(n.)风暴;暴风雨GrammarinUseCompoundwordsearth+quakeearthquake(n.)地球;地面(n.)地震Anearthquakeisaquakeofthesurfaceoftheearth.(n.)震动;颤抖合成词：由两个或两个以上独立的单词组合在一起，构成一个有新含义的单词，叫合成词。合成词两大特点:(1)整体算一个词，有自己的意思，不一定是两个词简单相加。例：butterfly：butter(黄油)+fly(飞)≠

黄油飞

→

真正意思：蝴蝶breakfast：break(打破)+fast(快)≠

打破快

→

真正意思：早餐(2)词性统一，有独立的词性，在句子里当一个词用。例：名词：blackboard（黑板）、flashlight（手电筒）动词：housework（做家务）、download（下载）形容词：hard-working（勤奋的）、part-time（兼职的）

合成词最常用构成方式：①名词+名词（最常见）thunder(雷;雷声)+storm(风暴;暴风雨)=thunderstorm(暴风雨)snow(雪)+storm(风暴;暴风雨)=snowstorm

(暴风雪)sand(沙子)+storm(风暴;暴风雨)=sandstorm

(沙尘暴)②名词+动词/副词house(家;房子)+work(工作)=housework(家务)earth(大地)+quake(震动)=earthquake(地震)③形容词+名词black(黑色的)+

board(木板)=

blackboard(黑板)green（绿的）+house（房子）=greenhouse(温室)hot（热的）+dog（狗）=hotdog(热狗)1.You’dbetterbringa(n)____________ifyouneedtowalkonadarkroad.2.Peoplelivinginthedesertknowhowtokeepthemselvessafewhena(n)__________

comes.3.Weshouldbuycookedfoodandcleanwaterinthe_____________beforesnowstorm.4.Astrong______________oftheearthquakehappenedabout40minuteslater,anditcausedmoreharmtothearea.Fillintheblankswiththegivenwordsinthebox.flashlightsandstormaftershocksupermarketflashlightsandstormsupermarketaftershockReadingReadthetextandguessthemeaningoftheunderlinedwordsWithfewergrasslandsinsomeareas,thesandstormappearsmoreoften.Sandstormscancoverfarmlands,causetrafficaccidents,andharmhumanhealth.Peopleshouldtakeactionintimetofightagainstsandstorms.Or,thesandstormmaybecomeaworldwideproblem.①grass(草;青草)+land(土地;陆地)=grassland(草原;草地)②sand(沙;沙子)+storm(风暴;暴风雨)=sandstorm(沙尘暴)③farm(农场)+land(土地;陆地)=farmland(农田;耕地)④world(世界)+wide(宽的;广泛的)=worldwide(全世界的;在全世界)

ReadthetextandguessthemeaningoftheunderlinedwordsReadtheconversation.Payattentiontothewordsinbold.Willtherebeadisasterpreventiontrainingatschooltomorrow?Noproblem!Whatshouldweweartoschool?Yes.Wemustarriveearlierthanusual.We’dbetterwearsportsshoes.Wecanperformbestinsportsshoes.副词用来修饰动词、形容词、其他副词，表示动作的程度、方式、时间等。和形容词一样，副词也有原级、比较级、最高级。规则变化：①一般直接加

-er/-est例：fast→faster→fastesthard→harder→hardest

②以

-ly

结尾的副词，加

more/most例：carefully→morecarefully→mostcarefully

quickly→morequickly→mostquickly③以“辅音字母+y”结尾，变

y

为

i再加-er/-est例：early→earlier→earliesthappy

→happier→happiest

④以e结尾，只加-r/-st例：late→later→latestnice

→nicer→

nicest不规则变化（需单独记忆）：例：well→better→best

badly→worse→worst

much→more→most核心用法：(1)原级：as+副词原级+as：和……一样……例：Herunsasfastashisbrother.（他跑得和他哥哥一样快。）(2)比较级：副词比较级+than：比……更……例：Shegetsupearlierthanme.（她比我起得早。）表示否定的比较级可用：less+副词原级+than：……不如……。例：Herunslessfastthanhisbrother.（他跑得不如他哥哥快。）核心用法：(3)最高级：(the)+副词最高级+in/of：某人（或某物）在某范围内最……，副词最高级前the常可省略。例：Hejumps(the)highestinhisclass.（他在班上跳得最高。）常用结构：1.比较级+and+比较级：越来越……例：Itisrainingharderandharder.（雨越下越大。）2.the+

比较级...,the+

比较级...：越……就越……例：Theearlieryoustart,thebetteryoudo.（你开始得越早，做得就越好。）3.much/even/alittle+比较级：表示不同程度例：Itrainsmuchmoreheavilythanbefore.（雨下得比以前大得多。）Heworksevenharderaftertheexam.（考试后他学习甚至更努力了。）Completethetableandlearnhowtousethecomparativeandsuperlativeadverbs.AdverbsComparativeSuperlativefastTheforestfirespreadfasterthanwethought.Theguardsran(the)fastesttoputoutthefire.carefullHedrives____________thanIdo.XiaFengchecksthewindows________________________.farWeneedtowalk____________tokeepawayfromtheflood.Thefloodwaterreached__________intotheeasternpartofthecityaftertheheavyrain.morecarefullyfarther(the)mostcarefully(the)farthestCompletethetextwiththecorrectformofthegivenwords.badfarhardhighterribleOnNovember1st,2012,HurricaneSandysweptthroughourtown.Istillrememberhowterriblethesuperstormwas.Welived____________awayfromthebeachthanmostofourneighbors,andourhousestoodonahillside.Ithoughtweweresafe.Butthewindwasblowing___________everyminuteandthewaveskeptreaching_____________.Soon,thestormarrivedandtookawaytheroofofourhouse.Ithitthebeachsideofthetown______________.Nearlyeverythingtherewasgone.Itisa____________painfulexperienceformeandIstillcan’tgetoverit.fartherharder(the)worstterriblyhigherExercise单项选择1.Ofallthefirefighters,Tomran________tosavethepeople.A.fast B.faster C.fastest D.mostfast2.Asnowstormisastormwithstrongwindsandalotof________.A.rain B.snow C.thunder D.lightning3.Thewindblew________yesterdaythantoday.Itwasre