看漫画学现在完成时.ppt
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1、Perfect Present Tense,现在完成时,Lets enjoy a video.,Maidou is at home,现在完成时的构成(肯定)have/has过去分词(否定)have/has not过去分词(疑问)have/has主语过去分词(否定疑问)havent/hasnt主语过去分词 或have/has主语not过去分词(被动语态)主语 have/has been 过去分词,现在完成时Definition现在完成时表示到现在为止已经完成或仍在持续的动作、状态,强调对现在的影响、联系,或表示经历、经验。,二、现在完成时的用法 have(has)过去分词1现在完成时用来表示现在
2、之前已发生或完成的动作或状态,但其结果却和现在有联系,也就是说,动作或状态发生在过去但它的影响现在还存在。I have lost my wallet.(含义是:现在我没有钱花了。)Jane has laid the table.(含义是:已可以吃饭了。)Michael has been ill.(含义是:现在仍然很虚弱)He has returned from American.(含义是:现在已在此地),2现在完成时可以用来表示发生在过去某一时刻的,持续到现在的情况,常与for,since连用。Mary has been ill for three days.I have lived here
3、 since 1998.Exercises:7、11、12、14、17、19、20.,3现在完成时往往同表示不确定的过去时间状语连用,如:already,yet,just,before,recently,lately等。He has already obtained a scholarship.I havent seen much of him recently(lately)We have seen that film before.Have they found the missing child yet?,4现在完成时常常与表示频度的时间状语连用,如:often,sometimes,ev
4、er,never,twice,on several occasions等。Have you ever been to Beijing?I have never heard Bunny say anything against her.I have used this pen only three times.It is still good.George has met that gentleman on several occasions.,5现在完成时还往往可以同包括现在时间在内的时间状语连用,如:now,up to these few days/weeks/months/years,th
5、is morning/week/month/year,now,just,today,up to present,so far等。Peter has written six papers so far.Man has now learned to release energy from the nuclear of the atom.There has been too much rain in San Francisco this year.The friendly relations and cooperation between our two countries have been en
6、hanced in the past few years.Up to the present everything has been successful.,6现在完成时表示现在之前已完成的动作,虽然其效果或影响仍然存在但已不再继续,但是有一些现在完成时的句子,在后面加上for一段时间,现在完成时的动作就表示延续性。Thomas has studied Russian.(现在不再学俄语)Thomas has studied Russian for three years.(Thomas began to study Russian three years ago,and is still st
7、udying it now.(同第2点用法第一个例句),7现在完成时还可以用来表示过去的一个时间到现在这段时间内重复发生的动作。We have had four texts this semester.,三、现在完成时的“完成用法”和“未完成用法”1现在完成时的“完成用法”现在完成时的“完成用法”指的是动作发生在过去某一时刻并已结束,但该动作对现在产生了影响,与现在情况具有因果关系。He has turned off the light.他已把灯关了。(动作结束于过去,但说明的是现在的情况灯现在不亮了。)现在完成时“完成用法”的特点是动作不延续,因此,该时态只能与表示不定的过去时间状语(如:a
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