过去完成时课件.ppt
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1、Revision,The Present,Perfect Tense,现在完成时,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,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
2、/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.,The Past Perfect Tens
3、es,New,过去完成时,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?,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。,我已经做完作业了。,表示在说话时已经做完。,I have finished my home-work.,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,
4、与现在无关。,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.,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!,过去完成时与现在完成时二者用法基本相同,但
5、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,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:,Before I met her,I had heard a lot about her.,Before/When/By the time/ByBy the end of,+,过去时态,+,从句,过去完成时态,主句,(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
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