Unit8-unit10现在完成时知识点讲解练习人教版英语八年级下册.docx

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1、现在完成时一、定义（1）表示过去发生或已经完成的动作对现在造成的影响或结果。（谓语动词一般为短哲性动词例如：He has just had iny breakfast, 他刚吃了我的早饭。“电饭”是发生在过去的动作,目段在造成的靖果是“忸不用了.我没饭吃了）I have just cleaned my clothes.我刚洗过衣服.（2）表示动作从过去某一时刻开始一直持续到现在的动作或状态, 该动作或状态还有可能继续下去.（谓语动词一般为延续性动词）例如：I have lived in London since I was ihree years。忖,我,三岁起就生活在伦敦,I have li

2、ved here for cighiccn years.我已经在这里居住（十八年九 二、结构（注意这里的have/has为助动词）肯定句主语+ have/has +动词过去分诃+其他.You have seen the film Harry Potter twice.否定句主语+ have/has+ not +动词过去分词+其他.You havent seen the film Harry Poller twice.一般疑问句及其答 语Have/Has+主语+动词过去分词+其他？ Have you seen the film Harry Poller twice?肯定回答： Yes,主语+ha

3、vc/has否定回答：No法语+havcnUha$nt.特殊疑问句特殊疑问词+hH、c/has+主语+过去分词+其他？三、时间标志词（1） already C.wenlD.has been in检测1. What did you do last Saturday?-I my uncle.A.visitB.havc visited C.visited D.am visiting2. The factory since the February of 1988.A. has been openB. has openedC.was openD. opened3. Mary and Rose frie

4、nds since they nwt in 2009.A. have madeB. have beenC.madeD. have become4. The meeting for a week now.A. has finishedB. has endedC.has been over5. My mother the windows already, so the room looks much brighter.A. has cleaned B. had cleaned C. is cleaning D. will clean6. Great changes all over the wor

5、ld since 2019. Most people like to do sportsto keep healthy.A.cakes placeB.have taken placeC.will take place D.cook place7Jim the information he needs yet. So he cant finish his work soon.A.hasnt foundB.won*l findC.doesnt findD.didnt find补充：现在完成时与一般过去时的区别：1、现在完成时强调过去发生的某一动作对现在造成的影响.强调的是现在的情况：而一般过去时表

6、示过去发生的动作或存在的状态，与现在无关.2、常与现在完成时连用的标志词有：already（已经）,yct（已经）.ncvcr（从不）,ever （曾经）Jusi （刚刚）3ofar.（到目前为止）.since+时间点/从句（从句常用一般 过去时）,for+时间段；常与般过去时连用的标志词有yesterday （昨天）,last year（去年）.ago （之前）.in 1990 （在 1990 年）,just now （刚才）等.拓展：延续性动词与非延续性动词的转换：（1）非延续性动词（短语转换为相应的延续性动词（短语）I、借：borrow-keep2、买：buyhave（2） IF遑续性动

7、词（悔语好换为“be+形容词/制词/介词/X词等”3、团开：leave be away 4 死：die be dead 5、来：come （to） be （in/a（）6、到指到达”）：arrive/reachbe（in/at） 7、开始：begin/startbeen8、加入：joimtake part inbe in 9、患感日：catch a coldhave a cold10、打开：openbe open 11、关上:close be closed 12、担心：worrybe worried 13、【可来：come back/go back/reiurnbe back 14、结如：niany/gei marriedbe married （to） 15、睡着：fall asleephe asleep