1、现在完成时现在完成时（三）（三）现在完成时结构肯定句：主语肯定句：主语+have/has+过去分词过去分词+.否定句否定句:主语主语+havent(have not)+过去分词过去分词 主语主语+hasnt(has not)+过去分词过去分词.疑问句疑问句:Have/Has+主语主语+过去分词过去分词.?I havent had my dinner.I have had my dinner.结构结构Have you had your dinner?现在完成时用法表表示到现在为止示到现在为止已经完成或刚刚完成已经完成或刚刚完成的动作。的动作。表示过去发生的动作表示过去发生的动作,强调强调结果结果
2、或对现在的或对现在的影响影响。表示从过去开始并表示从过去开始并持续到现在持续到现在的动作或状态。的动作或状态。I have already lost the key.They have built many buildings in this city.用法用法He has lived in Shanghai for five years.易错点1since/for用法辨析since+表示过去的时间点表示过去的时间点since+ago/last构成的时间短语构成的时间短语since+从句（一般过去时）从句（一般过去时）John has been a football player since
3、3 years ago.He has lived in China since 1992.sinceTom has lived in America since he was a little child.for+时间段时间段forHe has kept the book for 2 weeks.易错点2非延续性动词转化为延续性动词短暂性动词不能用于完成时，被称为非延续性动词。为了表述这种意思，我们常用相应的延续性动词来代替非延续性动词。buy,borrow,arrive,come,die,fall,go,join,leave等。常见的非延续性动词他入党五年了。他入党五年了。He joined
4、 the Party five years ago.He has been in the Party for five years.He has been a Party member for five years.转化规律beginbe onreturnbe backleavebe away fromjoinbe ingobe offdiebe deadcomebe herearrivebe hereborrowkeepbuyhaveThe football match began at 9:00 a.m.The football match has been on since 9:00 a
5、.m.My teacher left Nanjing 3 days ago.My teacher has been away from Nanjing for 3 days.请找出漫画中现在完成时请找出漫画中现在完成时表达的句子！仔细理解画表达的句子！仔细理解画圈单词的含义并推测他们圈单词的含义并推测他们的用法。的用法。看漫画找规律看漫画找规律Mr.and Mrs.Green have owned this house for fifty years.They moved in on their wedding day and they have lived here ever since.T
6、he village has changed a lot during that time.But Mr.and Mrs.Green still love it.They have never wanted to live anywhere else.典例典例1 1：用：用forfor或或sincesince填空填空Ive taken driving lessons _last month.We havent used our car _ a long time.since for典例典例2 2Excuse me,when did you leave Jinzhou?In August,2017.I _ for about two years.【2019锦州锦州】A.have left B.left C.have been away D.was away
