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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Revision,The Present,Perfect Tense,现在完成时,Revision The PresentPerfect T,1.,现在完成时态表示过去发生的动作对现在造成的影响或结果,Our teacher has left.,We have studied English.,I have already finished the homework.,He has had his lunch.,He has become a doctor.,构成,have/has+,过去分词,1.现在完成时态表示过去发生的动作对现在造成的影响或结果构成,2,.,某个动作从过去已经开始,一直持续到现在,还有可能持续到将来,.,动作的持续性要通过一段时间来表示,.,(1)recently,in recent years,(2)For/in/during/over the last/past 30 years,great changes have taken place in my hometown.,(,3),Since +,过去的某一时刻,since nine yesterday since last week since you came since you got home.,We havent seen each other since last year.,We havent seen each other since we graduated from our university.,2.某个动作从过去已经开始,一直持续到现在,还有可能持续到将,The Past,Perfect Tenses,New,过去完成时,The Past Perfect TensesNew过去完成,现在完成时：,助动词,have,/,has,+,过去分词,过去完成时：,助动词,had,+,过去分词,构成？,现在完成时：助动词have/has+过去分词过去完成,我认识他三年了。,I,have known,him for three years.,I,had known,him when I,was,a student.,我当学生时，就已经认识他了。,我认识他三年了。I have known him fo,我已经做完作业了。,表示在说话时已经做完,。,I,have finished,my home-work.,我已经做完作业了。表示在说话时已经做完。I have,在六点以前，我就已经完成作业了。,By six oclock,I,had finished,my homework.,表示在过去的某一段时间（,six oclock,以前）已经做完作业，与现在无关。,在六点以前，我就已经完成作业了。By six ocl,他们已经吃过早饭了。,在他们到旅馆之前他们已经吃过早饭了。,They,have,already,had,breakfast.,They,had,already,had,breakfast,before,they,arrived,at the hotel.,他们已经吃过早饭了。在他们到旅馆之前他们已经吃过,我从未看过如此令人兴奋的比赛,他说他从未看过如此令人兴奋的比赛。,I,have,never,seen,such an exciting match before!,He,said,that he,had,never,seen,such an exciting match before!,我从未看过如此令人兴奋的比赛 他说他从未看过如此令人,过去完成时与现在完成时二者用法基本相同，但现在完成时以现在时间为基点，过去完成时则以过去的时间为基点，与现在无关，即过去的过去。过去完成时常用于宾语从句中,;,Summary,过去完成时与现在完成时二者用法基本相同，但现在完成时以现在时,用于由,by,before,等构成的短语引导的从句或者通过上下文表示。,具体用法如下：,用于由by,before 等构成的短语引导的从句或者通过上,Before,I,met,her,I,had heard,a lot about her.,Before/When/By the time/,By,By the end of,+,过去时态,+,从句,过去完成时态,主句,Before I met her,I had heard,（,2,）,by the time,（,=,when,）,我们赶到学校时，已经上课了。,到,时,_ we got to school,the class _ already _,By the time,had,begun.,（2）by the time（=when）我们赶到学,当我到达火车站时，火车已经开走了。,By the time,I _ to the station,the train _ already _.,got,had,left,当我到达火车站时，火车已经开走了。By the tim,到上学期末，我们共学,1500,个单词。,By,the _ of _ term we _ _1,500 words,end,last,had learnt,到上学期末，我们共学 1500 个单词。,当他到学校时，他意识到他把作业忘在家里了。,When,he _ to school,he _ that he _ his homework at home.,had left,got,realized,当他到学校时，他意识到他把作业忘在家里了。When he,Put the Chinese into English,She said they _ _,all the preparation _ I came,.,had,made,before,她说在我来之前她们已经做好了一切准备。,Put the Chinese into EnglishSh,当我到达学校时，学生们都已经放学了。,School _ over by the time I _ there.,had been,got,当我到达学校时，学生们都已经放学了。School _,当我迟到,20,分钟到机场时，他已经乘出租车去宾馆了。,He _ _ a taxi to the hotel when I _ _ the airport 20 minutes later.,had taken,got to,当我迟到20分钟到机场时，他已经乘出租车去宾馆了。He,当我昨天到达电影院时，电影已经开始了。,When I got to the cinema yesterday,the film had already begun.,当我昨天到达电影院时，电影已经开始了。When I got,他说他从来没读过如此有趣的故事。,He said that he had never read such an interesting story,他说他从来没读过如此有趣的故事。He said that,
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