学习目标学习目标1.知识目标：学习词汇：certain, active, possible, tidy, uncertain, inactive, impossible, untidy, incorrect, impatient学习词组：tidy up, be usual for, be possible to do sth. all over the floor, right now学习句子：Its usual for me to stay at home all day,Its possible to sleep with al that noise.Im certain that I can fix it myself.Things are all over the floor.Ill tidy up right now.学习目标学习目标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。 I think do-it-yourself is meaningful.It is really interesting to do it.prefix un-It isnt really interesting to do it.It is really uninteresting to do it.Prefix 前缀前缀A prefix is a letter or a group of letters that add to the front of a word to form a new word.前缀是添加在单词前形成新的单词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。的一个字母或者一组字母。The prefixes un-,in- and im-Oneofthemostcommonprefixesforadjectivesisun-.Itmeans“not”.Weaddittosomeadjectivestogivethemtheoppositemeaning.certaincomfortableimportantinterestingfriendlywelcomemanneduncertainuncomfortableunimportantuninterestingunfriendlyunwelcomeunmanned无人的Wecanusesomeotherprefixes,suchasin-andim-,toformnewwordswiththeoppositemeaning.The prefixes un-,in- and im-activecorrectpatientpossibleperfectpolitepersonalinactiveincorrectimpatientimpossible不可能的imperfect不完美的impolite无礼的impersonal非个人的前缀前缀dis-,dis- “不不”、“无无”，加在某些动词或名词前构成反义加在某些动词或名词前构成反义词。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likeagreeHonestAppearorderbelieveabilityAdd the correct prefixes to some of the adjectives so that all the sentences make sense. (Page51) 当堂反馈Finish the exercises in your exercise book .