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词汇专题（一）常用词缀佳一中2016高一英语组1学习目标1、了解词根词缀的基本功能2、学习常见词缀及其含义3、提升利用词根词缀扩展词汇量的能力2词根词缀的基本功能决定词的主体含义一般改变词义词根：词缀前缀：后缀：一般改变词性3否定前缀：un-:unexpected,unable,uncommon,unreal,unnaturaldis-:disorder,distrust,dishonestmis-:mistake,misunderstand,misuseim-:impossible,in-:inexperienced,independent,inexpensiveil-:illegalir-:irregularanti-:anti-waranti-nature常见前缀4常见前缀re-:restart,repeat,repaypre-:pre-reading,preshow,preparepost-:post-reading,postwarinter:international,internetover-:overbook,overwork,overhearco-:co-worker,cooperateauto-:automobiletrans-:transport,transform,sub-:subway,subtitle5micro-:microwave,Microsoftbi-:bicycletri-:tricycle,trianglemulti-:multiculturalen-:enlarge,enrich,encourage6常见后缀形容词后缀：-able:acceptable,usable,reasonable-ous:anxious,curious-ish:selfish,reddish,childish-al/-ual/-cal:actual,spiritual,medical,practical-ive:active,objective,-ful:painful,handful,mouthful7常见后缀动词后缀：-en:soften,harden,widen-ize:realize,organize,-fy:simplify,beautify8常见后缀名词后缀：-ion/tion/ation:imagination,operation,trasportation-ce/ance:importance,acceptance-ty:difficulty,curiosity,-th:growth,truth,width,-ment:experiment,argument-ness:kindness,rudeness,happiness-some:handsome,tiresome,troublesome9常见后缀名词后缀：表达特殊含义-hood:childhood,neighborhood,motherhood,daughterhood-ship:friendship,leadership,-ism:socialism,materialism-ache:toothache,headache性质，时期身份主义名词后缀：表人-ant:assistant,applicant-ist:novelist,specialist-mate:classmate,roommate-ian:musician,historian10EX1.Addanegativeprefixtoeachgrouptocreatewordswithoppositemeaning.__dis__-appearabilityagreehonest__un__-usualexpectedwillinghappyluckyfortunately__in__-correctcapablevisibleexperienced__im__-possiblepolitemature__non__-stopsmokers__mis__-understandtakefortunelead11EX3.AddSuffixtoeachofthefollowingwordstochangethepartofspeech.(1)n.→adj.hand→handfulmouth→mouthfulattract→attractiveact→activevalue→valuableunforget→unforgettablecloud→cloudyfog→foggynature→naturalnation→nationaldanger→dangerousfame→famouschild→childishself→selfish12(2)adj.→n.sad→sadnessdark→darknessdifferent→diffenceimportant→importanceable→abilityactive→_activity(3)v.→n.move→movementagree→agreementgovern→governmentdecide---decisioninvent→inventionsuggest→suggestioncelebrate→celebrationpollute→pollutionexplain→explanationexam→examination13(4)表示“人”dance→dancerassist→assistantpiano→pianistlibrary→librarianvisit→visitorclass→classmate14谢谢聆听！15