1、现在完成时His QR code has become blurred（模糊的）.His QR code became blurred（模糊的）.His QR code has become blurred（模糊的）.His QR code became blurred（模糊的）.现在完成时的动词结构：have/has+donebecame blurredpastnowcannot sign in产生影响现在完成时基本用法1：过去发生的动作对现在产生了影响。例句：Mike has lost his key and he is looking for it now.马克丢了他的钥匙，他现在正在找
2、他的钥匙。例题：判断该空是否需要用现在完成时Its said all the train tickets during the holidays were sold out.Dont worry.I _(get)two for us.A.是B.否A练习1：判断划线部分对错Dont return the video to Peter because I dont watch it.练习2：判断划线部分对错Both his parents look sad.Maybe they have known what happened to him.XHe has waited for the teach
3、er for nearly 30 minutes.He arrived at school at 15:10.nowpastwaited持续到现在has waited现在完成时基本用法2：过去发生的动作对持续到现在，还有可能继续持续下去。例句：The number of forest parks in Guangdong has increased to more than 1,000 so far.到目前为止，广东森林公园的数量已经增加到1000多个了。例题：判断该空是否需要用现在完成时I _(live)in Shenzhen since 10 years ago.A.是B.否A练习1：判断
4、划线部分对错 So far,we have succeeded in saving thousands of people in danger.练习2：判断划线部分对错 Today,she collects over one million books and has sent them to many states and countries around the world.X持续/影响总结nowpastHave you finished your homework yet?I havent finished my homework yet.Have you finished your h
5、omework yet?I havent finished my homework yet.I have already finished my homework.时间标志词句型yet疑问句、否定句already肯定句例题：Their parents havent come back _.练习1：Have they begun Unit Eleven _?练习2：Their parents have _ come back.yetyetalreadyTheir parents have come back already.用already或者yet填空：时间标志词句型句中位置yet疑问句、否定
6、句句末already肯定句 句中（have/has之后）句末例题：(2019-2020年八上U5能力测试)Have you completed your homework_?No.There is too much for me to do.A.everB.alreadyC.yetC练习1：You _ that question three times.A.already askedB.have already asked C.already have askedD.asked already 练习2：Has your sister finished reading _?Yes.She has
7、 _ finished it.A.yet;yetB.yet;alreadyC.already;yetBBThe epidemic（疫情）has continued for more than 1 year.The epidemic（疫情）has continued since November 2019.The epidemic（疫情）has continued since it was first discovered in Wuhan.for时间段since过去的时间点/过去的动作例题：We have been friends since _.A.five years B.after fi
8、ve years C.five years ago练习：用for或since填空1.His mother has taught Japanese _ over ten years.2.I havent seen him _ last February.Cforsince总结yet句型：疑问句、否定句句中位置：句末already句型：肯定句句中位置：句中、句末for+时间段since+过去的时间点/动作自2009年起，双十一购物节已经持续了11年。Since 2009,the Double 11 Shopping Festival has lasted for 11 years.现在完成时：一个
9、动作在过去发生，对现在产生影响或持续到现在。The Double 11 Shopping Festival I have bought a lot of things.Ma Dongmei watched the movie Leap.Ma Dongmei has watched the movie Leap.影响性影响性练习练习1.The water dark and dirty.Its not safe to drink now.A.became B.has become2.The boy is happy because he all the newspaper.A.sold B.has
10、 soldBBMrs.Ma had an iPhone 11.Mrs.Ma has had an iPhone 11.现在不用了现在还用持续性持续性Mr.Ma stayed at home for 14 days.Mr.Ma has stayed at home for 14 days.现在不待在家里了现在还待在家里持续性持续性When _you _Lucy in New York?I _her for two years.A.didmeet;havent seen B.didmeet;didnt see C.havemet;havent seenD.have.met;didnt see练习练
11、习A复习：现在完成时复习：现在完成时vs.vs.一般过去时一般过去时在过去发生在过去结束Ma Dongmei watched the movie Leap.Mr.Ma stayed at home for 14 days.pastnow与现在无关Ma Dongmei has watched the movie Leap.过去发生的动作与现在 （有/没有）联系，指的是过去发生的事情 （影响/持续）现在。Mr.Ma has stayed at home for 14 days.过去发生的动作与现在 （有/没有）联系，指的是过去的动作 （影响/持续）现在。有有影响持续pastnow在过去发生持续/影响复习：现在完成时复习：现在完成时vs.vs.一般过去时一般过去时总结：现在完成时vs.一般过去时pastnowpastnow持续/影响一般过去时现在完成时（随风而逝）（藕断丝连）thank you！
