现在完成时.ppt

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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 hav

2、e collected all the 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 b

3、orn .,过去式、过去分词,(1)一般动词，在词尾直接加“ 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 makemadem

4、ade saysaidsaid findfoundfound hearheardheard meetmetmet 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 cutcutcut put putput letletlet readreadread,易错点,I started learning English in

5、 2012. I am learning English these days. I have learned 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 bef

6、ore. I havent been to Australia before. Have you been to 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 return

7、ed yesterday. There was a temple in the past.,He has been in 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。,

8、【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。,