高中英语 unit1 tales of the unexplained grammar and usage教学设计2 牛津译林版必修2 (2)

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1、单　　元：Unit1Talesoftheunexplained板　　块：Grammarandusage2Thoughtsonthedesign:Learnthedifferencesbetweenthepresentperfecttenseandthepresentperfectcontinuoustense.Teachingobjectives:1.Learnhowtoformandusethepresentperfecttense.2.Understandwhenthepresentperf

2、ectcontinuoustenseisusedinsentences.Teachingprocedures:Step1Comparethetwotenses1.Weusethepresentperfecttensetotalkaboutanactioncompletedintherecentpast,andthepresentperfectcontinuoustenseforanactionthatstartedinthepastandisstillhappening.现在完成时和现在完成进行

3、时都表示动作从过去开始，但现在完成时可表示事件或动作刚结束，而现在完成进行时则强调动作仍在继续。1)LiJiahasreadabookaboutStonehenge.（表示她已经读完了。)2)LiJiahasbeenreadingabookaboutStonehenge.(表示她仍在读。)2.Wecanusethepresentperfecttenseforrepeatedactions,andthepresentperfectcontinuoustensefornon-stopactions.

4、Weusuallyusethepresentperfecttensetoaskquestionsbeginningwithhowmany/much,andthepresentperfectcontinuoustensetoaskquestionsbeginningwithhowlong.现在完成时可表示反复发生的动作，提问时用howmany/howmuch。而现在完成进行时则表示持续的、不间断的动作，提问时用howlong。1)—HowmanytimeshaveyouvisitedEgyptth

5、ismonth?你这个月去了埃及几次？—IhavevisitedEgypttwicethismonth.我这个月去了埃及两次。2)—HowlonghaveyoubeentouringEgypt?你在埃及旅游多久了？—IhavebeentouringEgyptfortwomonths.我已经在埃及旅游两个月了。3.Wecanuseeitherastateverboranactionverbwiththepresentperfecttensebutweusuallycanonlyuseanactio

6、nverbwiththepresentperfectcontinuoustense.现在完成时可以用表示状态的动词或表示动作的动词做谓语。而现在完成进行时则只能用表示动作的动词做谓语。1)Ihavehadthiscameraforfiveyears.(had是表示“拥有”状态的动词)2)IhavetakenphotosofUFOswiththiscamera.(taken是表示动作的动词)3)IhavebeentakingphotosofUFOswiththiscamera.(taking是表示

7、动作的动词)4.Weusethepresentperfecttense,notthepresentperfectcontinuoustense,withthewordslikenever,yet,alreadyandever.现在完成时的句子中可以用像never、yet、already和ever这样的词，而现在完成进行时的句子中则不可以用这样的词。Exercise:(T)IhavenevervisitedAmerica.(T)IhavealreadybeentoAmerica.(F)Ihaven

8、everbeenvisitingAmericaStep2Practice1.PartA:Readtheconversationandcircletherightwordstocompleteit.Answers:(1)heard(2)beendoing(3)beenresearching(4)beendoing(5)started(6)done(7)read(8)found(9)started(10)beendoing(11)beenmaking2.Trytoanswerthefollowing