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派生(derivation)前缀(prefix)&后缀(suffix)•复习构词法之一——派生，了解前缀和后缀的作用•学习常见的前缀和后缀•应用：①语法填空②阅读理解中猜词义学习目标able____________________________反adv.vt.反adj._______Lead-inableunableablyenabledisable反adv.vt.反adj.disabled派生法：由词缀（分前、后缀）和词根相结合构成新单词的方法。加前缀：happy→unhappy加后缀：develop→development既加前缀又加后缀：forget→unforgetable派生词前缀表否定：dis-,in-,im-,ir-,il-,un-,non-dislikeincorrectimpoliteirregularillegalunlikenon-stopover-：超过，超出overweightoverworkoversleepmis-：错误misunderstandmisdore-：再，又rewritereusepre-：先于...previewprepayfore-：前,预先foreheadforecast后缀1.名词后缀：表人：-er,-or,-istworkeractorartistadj.→n.:-nesssadnessdarknessv.→n.:-t/-te→-tionact→actioninvent→inventionv.→n.:-mentdevelopmentmovement2.形容词后缀：-ful：充满...的carefulharmful-less:缺少...的carelessharmless-ive：有...倾向的effectiveattractive-able：可以/能够...的buyableenjoyable-ed：①(人)感到...的annoyed②表被动writtenwords③表完成boiledwater-ing：①令人...的annoying②表主动thedancinggirl③表进行中boilingwater3.副词后缀：-ly:quicklyequallyPS：并非全部-ly结尾的词都是副词：lovely可爱的friendly友善的likely可能的lonely孤独的4.动词后缀-en：使...deep→deepenwide→widen有时en-：enableenlargeenrich思考：前缀和后缀分别改变的原词的什么？possible→impossibleinvent→invention前缀后缀词性意思Task1•valuev.→________有价值的•entertainv.→________n.•likelyadj.→反义：_______•readv.→________误读•appearv.→________消失•joyn.→________adj.•broadadj.→________vt.拓宽，拓展•helpn.→________adj.无助的valuable-mentun-dis-mis--fulen--lessadj.娱乐adj.不可能的v.v.快乐的，高兴的Task2分析画线词的词性和词义。Thispossibilitywasunforeseeable，becauseitalmostneverhappened.unforeseeableunforeseeable不预先看见可以…的adj.不可预见的方法:拆分单词常见的猜词义题目:1.TheunderlinedwordXXXmeans/refersto/standsfor_________.2.ThewordXXXcanbereplacedby“_________”.3.What’sthemeaningofXXX?4.WhichofthefollowingistheclosestinmeaningtoXXX?1.RememberthatPeopleonlinemaynotbewhotheyseem.Becauseyoucan'tseeorevenheartheperson.Itwouldbeeasyforsomeonetomisrepresenthimselforherself.Thussomeonewhosaysthatsheisa12-year-oldgirl.couldreallybeanoldman.A.makeawrongjudgement(判断)aboutB.understandsomebodywronglyC.giveawrongdescription(描写)ofD.formawrongopinionabout∨Task3mis-错误representvt.陈/描述2.Don’tlistentohisnonsense.A.meaninglesswordsB.beautifulwordsC.meaningfulwordsD.unpleasantwords3.Helivedahardlifeinpre-liberationdays.A.beforeliberationB.afterliberationC.sinceliberationD.duringliberation∨∨non-:非，无sensen.意义pre-:在...之前liberationn.解放4.Shopsareveryovercrowdednow.A.busywithmuchworkB.havingtoomanypeopleC.fullofenergyD.toocomplicatedtounderstand5.Hewasperformingandhistechniquewasunbelievable.A.canbetrustedB.veryexcitingC.veryattractiveD.difficulttobelieve;verygoodun-表否定believev.相信-ableadj.能...的∨∨over-过度crowdv.拥挤-edadj.Task4•运用所学知识，完成语法填空练习。•解题方法：1、阅读全句，正确理解句义及所缺词词义。2、分析缺词担任的句子成分，正确判断词性。(如动词、名词等)3、判断缺词应采用的正确词形。(如动词的形式、名词的单复数等)Withoutproperplanning,tourismcancauseproblems.Forexample,toomany________(tour)cancrowdpublicplaces,whicharenotso_________(enjoy)forpeoplelivingthere.Iftourismcreatestoomuchtraffic,peopletherewillbecome_______(annoy)andunhappy.Theybeginto_______(like)touristsandtotreatthem_______(politely).Theyforgethow_______(help)tourismcanbetothecountry’seconomy.-ed-ableimpolitely-istsdis--fulItisimportanttothinkabouthowtourismaffectsthepeopleofadestination(目的地)country.The_______(develop)oftourismisquitebeneficial,sinceitcanhelpacountrykeepthecustomsandbeautythatare_______(attract)totourists.Itwillalsoadvancethewealthand________(happy)oflocalpeople.Toomuchtourismcanbeaproblem.Iftourismgrowstoo________(quick),peoplemustleaveotherjobstoworkinthetourismindustry.Thismeansthatotherpartsofthecountry’seconomycansuffer.-ment-ivehappiness-lyExerciseonthepaper.ExerciseonP28,Workbook.HomeworkYouthisakindofwealth.Itwillgradually______(appear)withtimeelapsing(流逝).Whatcanwedoisnottowastetheyouth.Inmyopinion,foronething,itistorealizeourvalue,ouridea.Whenweareyoung,wehavethebestconditionsinourlives,goodmemories,good________(understand)andsoon.Weshouldmakefulluseoftheseconditionstostudymore.Foraother,weshould______(rich)ourlives,makethem______(color)andandgatherasmanydifferentexperiencesaspossible.1dis--ingsen--fulTeenagers’secretsshouldbekepttothemselves,andnooneelse,includingtheirparents,hastherighttosticktheirnosesintothechildren’sprivatelife.Asweknow,teenagersaregoingthroughaspecialperiodof_________(develop)bothphysicallyand_________(psychological).Theyarecuriousaboutandpuzzledbythe_________(expect)changesintheirbodyandmind.What’smore,exposedtoaworldofadults,itisonlytoo_________(nature)forthemtobeginimitatingadults’behaviorinsecret.Boysbegintosmokeandgirlsbegintospendtimedoingtheirhair.2unexcepted-ment-lynaturalSomeevenbegintodatewithagirlfriendoraboyfriendwithouttheirparents’knowledge.Theyaredoingallthisinsecretbecausetheyarestill_________(sure)whetheritisrighttodosoandafraidthat,iffoundoutbytheirparents,theywillget________(misunderstand).Andinfact,inmanycases,parentscannotdealwiththematterwellandhurttheirchildren’sfeelings_________(bad),sothechildrenarenot_______(will)tocommunicatewiththem.Whenthishappens,ithurtsterriblythewholefamily'sfeelings.Soitseemsrightthatteenagersshouldkeeptheirsecretstothemselvesandtheirparentsshouldallowtheirchildrenthatright.un-mis