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1、Unit8语法专项课件（现在完成时1）,初中英语人教版八年级下册,现在完成时结构,肯定句：主语+have/has+过去分词+.,否定句:主语+havent(have not)+过去分词 主语+hasnt(has not)+过去分词.,疑问句:Have/Has+主语+过去分词.?,I havent finished my homework.,Have you finished your homework?,I have finished my homework.,现在完成时三大用法,用法1,1)表示到现在为止已经完成或刚刚完成的动作。,By now,I have collected all th
2、e data I need.Now we have planted all the trees.,现在完成时三大用法,用法2,2)表示过去发生的动作,强调结果或对现在的影响。,Someone has broken the window.I have just cleaned my hands.,(窗户现在是坏的),(手是干净的),现在完成时三大用法,用法3,3)表示从过去开始并持续到现在的动作或状态。,She has learned English for 5 years.He has lived in Beijing since he was born.,过去式、过去分词,(1)一般动词，在
3、词尾直接加“ed”。work-worked-worked(2)以“e”结尾的动词，只在词尾加“d”。live-lived-lived(3)以“辅音字母+y”结尾的动词，将“y”变为“i”，再加“ed”。study-studied-studied(4)重读闭音节结尾，末尾只有一个辅音字母，先 双写该辅音字母，再加“ed”。drop-dropped-dropped,规则变化,过去式、过去分词,不规则变化,A.过去分词与过去式形式一样havehadhad spend spentspent makemademade saysaidsaid findfoundfound hearheardheard m
4、eetmetmet leaveleftleft,过去式、过去分词,不规则变化,B.过去分词与过去式形式不一样taketooktaken speak spokespoken singsangsung drivedrovedriven bewas/werebeen gowentgone,过去式、过去分词,不规则变化,C.过去分词、过去式与动词原形一样cutcutcutput putput letletletreadreadread,易错点,I started learning English in 2012.I am learning English these days.I have learn
5、ed English for 3 years.,（一般过去时）,（现在进行时）,（现在完成时）,现在完成时VS一般过去时,易错点,现在完成时/一般过去时用法不同,易错点,现在完成时/一般过去时用法不同,I saw this film yesterday.I have seen this film.,（一般过去时：强调动作）,（现在完成时：强调影响）,已经知道内容,易错点,现在完成时/一般过去时结构不同,易错点,现在完成时经典例句：I have been to Australia before.I havent been to Australia before.Have you been to
6、Australia before?,现在完成时/一般过去时结构不同,易错点,现在完成时/一般过去时结构不同,一般过去时经典例句：My father flew to Australia yesterday.My father didnt fly to Australia yesterday.Did you father fly to Australia yesterday?,易错点,现在完成时/一般过去时标志词不同,易错点,现在完成时/一般过去时标志词不同,She returned yesterday.There was a temple in the past.,He has been in
7、New York for many years.Have you ever been to Beijing？,（一般过去时）,（现在完成时）,【典例1】He _ in this factory for 20 years already.A.will work B.works C.has worked D.is working,考查时态。already为现在完成时标志词,且 for+时间段表明对现在的“影响”，故选用现在完成时结构have/has done。,【典例2】Is Richard still living here?No,he _ to Paris already.A.had moved B.moved C.will move D.has moved,考查时态。No说明Richard不在此处，且already为完成时标志词，选用现在完成时结构have/has done。,【典例3】Julies father _ to London last month.He _ there three times.A.went,had gone B.has gone,has been C.went,has been D.has been,had gone,考查时态。last month为一般过去时标志词，选用went；three times表明去伦敦的“结果”“影响”，选用现在完成时。,
