高中英语 Unit1 Word power教学设计 译林牛津版课程必修4.doc

英语必修4译林牛津Unit1精品教案（3）Word
●Wordpower
We’lllearninthissectionsomecommonsuffixesthatcanbeaddedtonounsorverbstocreateadjectives.Andalsosomevocabularyrelatedtosalesandmarketing.
Step1:Brainstorming
1.Pleasethinkaboutthefollowingquestions:
Howarethefollowingwordsformed?
health(noun)healthy(adjective)interest(verb)interesting(adjective)
AnEnglishwordcanhaveseveralderivatives.AndpleasepayattentiontothefactthatmanyEnglishwordssharethesamerootword,eventhoughtheyhavedifferentmeaningsorpartsofspeech.
Nowhere’smoreexampleforyoutobetterunderstandwordformation.
breath(n.)breathe(v.)breathless(adj.)
act(v.)action(n.)actor(n.)actress(n.)activity(n.)
possible(adj.)impossible(adj.)possibility(n.)possibly(adv.)
friend(n.),friendly(adj.),friendless(adj.),friendship(n.),unfriendly(adj.)
Asyoucansee,manywordsarederivedbyaddingsuffixesorprefixestotherootwords.Oftenyoumaycomeacrossunfamiliarwordswhilereading,trytouseknowledgeofwordformationtoguesstheirmeanings.Willyou?Andcanyougivemoreexamplesaboutwordformation?
2.Shallwehaveacompetitiontoseewhocangivemoreexamplesorcreatemorewordsbyaddingsuffixesorprefixestotherootwords?
3.Asweknow,sometimesanEnglishwordcanbemadeupofthreeparts:aprefix,astemandasuffix.Astemisthemainpartofaword.Aprefixisagroupoflettersaddedtothebeginningofaword.Asuffixisagroupoflettersplacedattheendofaword.Bothprefixesandsuffixesmodifythemeaningofawordorchangeitintoadifferentwordgroup.Thefollowingisatableofcommonprefixes:

PrefixMeaningExamples(adjectives)un-Notunfair,unnecessary,unimportant,unhappyin-Notincorrect,invisible,incurable,inaccuratedis-showingoppositedisable,dishonest,disagree,disappear,discoverre-doagainrewrite,redo,rebuild,react,retell,recreatemis-badlyorwronglymisunderstand,misdirect,mistake,misuseStep2:LearningaboutWordformation
Thebasicpartofanywordistheroot;toit,youcanaddaprefixatthebeginningand/orasuffixattheendtochangethemeaning.Forexample,intheword"unflattering,"therootissimply"flatter,"whiletheprefix"un-"makesthewordnegative,andthesuffix"-ing"changesitf