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学习目标1.知识目标：学习词汇：certain,active,possible,tidy,uncertain,inactive,impossible,untidy,incorrect,impatient学习词组：tidyup,beusualfor,bepossibletodosth.alloverthefloor,rightnow学习句子：It’susualformetostayathomeallday,It’spossibletosleepwithalthatnoise.I’mcertainthatIcanfixitmyself.Thingsarealloverthefloor.I’lltidyuprightnow.学习目标2.技能目标：1)学习用否定前缀un-、in-和im-构成反义形容词的方法。2)学会使用否定前缀un-、in-和im-的形容词表达否定含义。Prefix前缀•Aprefixisaletteroragroupoflettersthataddtothefrontofawordtoformanewword.前缀是添加在单词前形成新的单词的一个字母或者一组字母。Theprefixesun-,in-andim-Oneofthemostcommonprefixesforadjectivesisun-.Itmeans“not”.Weaddittosomeadjectivestogivethemtheoppositemeaning.certaincomfortableimportantinterestingfriendlywelcomemanneduncertainuncomfortableunimportantuninterestingunfriendlyunwelcomeunmanned无人的Wecanusesomeotherprefixes,suchasin-andim-,toformnewwordswiththeoppositemeaning.Theprefixesun-,in-andim-activecorrectpatientpossibleperfectpolitepersonalinactiveincorrectimpatientimpossible不可能的imperfect不完美的impolite无礼的impersonal非个人的前缀dis-,dis-“不”、“无”，加在某些动词或名词前构成反义词。dislike不喜欢disagree不同意dishonest不诚实的disappear不见，消失disorder无秩序，混乱disbelieve不信disability无能，无力likeagreeHonestAppearorderbelieveabilityAddthecorrectprefixestosomeoftheadjectivessothatallthesentencesmakesense.(Page51)当堂反馈•Ithinkdo-it-yourselfismeaningful.•Itisreallyinterestingtodoit.prefixun-•Itisn’treallyinterestingtodoit.•Itisreallyuninterestingtodoit.•Idon’tthinkdo-it-yourselfisimportant.•Ithinkdo-it-yourselfisunimportant.Finishtheexercisesinyourexercisebook.