九年级上册Module6unit3专题之前缀后缀执教教师：刘丽Thegirlisvery_______.happyTheboyissad,heis_______.unhappy呜呜…下辈子我再也不当农民了trueusualununhealthy前缀1.前缀“un”表示否定意义“无,不”。happy1+1=2possible1+1=31元钱=1分possible?!?!证明：1元=100分=10分×10分=0.1元×0.1元=0.01元=1分impossible?!?!Yes,sometimesit’spossible.Butsometimesit’simpossible.impossiblepolite前缀“im”也表示否定意义“无,不”。表示否定意义“无，不”的前缀还有：in-incorrect,inhuman,dis-disagree,dislikere2.前缀“re”表示“再”=againcyclewriteuseturn学而时习之unhappyunsualunhealthyuntrueimpossibleimpoliteincorrectinhumandisagreedislikerecyclereuserewritereturn小结：加前缀，不改变单词的词性1.–able表示“可能，易于，适合于”，构成形容词，如：comfortable（想一想，还有吗？）后缀常见的后缀：reusable，enjoyable,lovable(可爱的)，eatable(可吃的)Thegirlisdoingherhomework,sheisverycareful.2.–ful表示“充满......的，具有......性质的”，构成形容词，如：helpful,hopeful，useful,careful3.–less与-ful相反，表示“少的，不足的”，构成形容词，如：helpless,hopelessuseless,careless小结：加后缀，改变单词的词性1Makenewwords.JointhewordsinBoxAwiththepartsofwordsinBoxB.fullofcare_______________AcarecollectdonehopepossibleusualusedwantedwasteB-able-fulim--lessre-un-careful1canbecollected_________2notdone________3fullofhope_______4withoutanyhope_______5notpossible_________6notusual_______7notused________8usedagain________9notwanted__________10makingalotofwaste_______collectableundonehopefulhopelessimpossibleunusualunusedreusedunwantedwasteful考查你的时间到了1.It’s____tothrowawaypaperandmetal.A.wasteB.wastefulC.wastes2.Heisso________thathealwaysmakesmistakes.A.carefulB.careC.careless3.Hefeels_____becausehelosthiswallet.A.happyB.happilyC.unhappy4.Don’tthrowawayyouroldbooks,youcan________them.A.reuseB.reusableC.usefulBCCAIt’s_________(possible)forustodosomuchworkwithinsolittletime.impossible小结：今天我们学习了什么重要的知识呢？Homework:找出我们学过的有前缀、后缀的其它单词Thankyou!Byebye!
