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1、Unit 4Do it yourselfStudy skillscomfortableuncomfortable Do you feel comfortable if you wear new leather shoes to run?uncomfortableThese trainers are to wear.Those are(not comfortable).prefixPresentationwelcome unwelcome(not welcome)Will you be welcome if you leave litter(垃圾垃圾)in the public areas?un
2、welcomefriendlyDo you think they are so friendly when they are fighting?Do you think they are so friendly when they are fighting?unfriendlyunfriendly1.He is not happy.2.Edison is not a usual man.3.This isnt an important thing.He is unhappy.Edison is an unusual man.This is an unimportant thing.Can yo
3、u say them in another way?opposites friendly happy comfortable safe healthy unhealthy“un-”(prefix)necessary welcome common able unableunfriendlyunhappyuncomfortableunsafeunnecessaryunwelcomeuncommonIs it possible to live without water?impossible(not possible)“im-”If someone shows good manners to oth
4、ers,he is a polite person.If someone does not show good manners to others,he is_ _.If someone does not show good manners to others,he is_.polite possible impoliteimpossible“im-”impolitenot politeppIs it correct to copy the others homework?incorrect(not correct)“in-”I dont believe what he says,becaus
5、e he is not honest.I dont believe what he says,because he is _.dishonestdishonest“dis-”The past form of sing is not regular.The past form of sing is irregular.regular irregular“ir-”honest Can you work out the rules?We can add _before an adjective to express the opposite meaning.“un-”,“in-”,im-”,“dis
6、-”,“ir-”Great!Using prefixes to form adjectives with opposite meaning.prefixesin-im-un-=notthe opposite ofir-dis-More rules:1.un-2.in-3.im-最常用的前缀最常用的前缀常用在以常用在以c开头的词前开头的词前常用在以常用在以 p 开头的词前开头的词前un-的的魅力魅力真是大，它的朋友遍天下。真是大，它的朋友遍天下。字母字母c在开头在开头,in-经常当帮手经常当帮手.前缀前缀im-遇到遇到p，二话不说走上去，二话不说走上去.certain comfortable i
7、mportant interesting uncertainuncomfortable unimportantuninteresting“un-”Practicepossible patient impossibleimpatient“im-”correct active incorrectinactive“in-”Read the conversations below.Add the correct prefixes to one of the adjectives so that all the sentences make sense.Annie:Do you spend a lot
8、of time doing outdoor sports?Simon:Sure.Its usual for me to stay at home all day.unusual Sandy:Our neighbour next door is putting something on the wall.Mum:Its possible to sleep with all that noise.impossibleMillie:Are you able to fix your bicycle,Andy?Andy:No,Im certain that I can fix it myself?unc
9、ertainMum:Suzy,your room is really tidy-things are all over the floors.Suzy:Sorry,Mum.Ill tidy up right now.untidy1.Its innecessary to wear the raincoat when it is sunny.2.It is imcorrect to read someone elses letter.3.Its nearly unpossible to see tigers in other places in China.4.David often says b
10、ad words to others,so he is inwelcome .5.Its infriendly to throw stones to birds.unnecessaryincorrectimpossibleunwelcomeunfriendly Correct the mistakes:Production1.This chair is too small.It is _ (comfortable)to sit in it.2.The boy is not very strong.He is always_(active)in sports.3.You cannot fly t
11、o the island directly.There are some _(direct)_flights4.I dont like him He is often_(friendly).5.the snow is so heavy.It is _(usual)to see such heavy snow here.6.Water is very important to us.It is _(possible)for us to live without water.7.My grandfather knows nothing about computer.He is _(able)to send emails.unableuncomfortableinactiveFill in the blanksFill in the blanksindirectunfriendlyunusualimpossible1.Finish the exercise paper.2.Remember the use of prefixes.3.Prepare for the next lesson.Homework: