现在完成时与过去完成时课件.ppt

关于现在完成时与过去完成时
第一页，本课件共有19页
The Past Perfect Tense
过去完成时态
第二页，本课件共有19页

Our teacher has left.
We have studied English.
I have already finished the homework.
He has had his lunch.
He has become a doctor.
have/has+过去分词
第三页，本课件共有19页
,一直持续到现在,.
一段时间的表达方法有两种:
for: +一段时间 for a year for two weeks for three years
Since 过去的某一时刻, since nine since last week
一般过去时态的时间状语从句
since you came since you got home.
注意:for 和since 所引导的时间状语都表示一段时间.
He has been away since last week.
He has been away for one week.
对划线部分提问都用How long
第四页，本课件共有19页
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？
第五页，本课件共有19页
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。
had known
have known
was
第六页，本课件共有19页
我已经做完作业了。
表示在说话时已经做完。
I have finished my home-work.
第七页，本课件共有19页
在六点以前，我就已经完 成作业了。
By six o’clock, I had finished my homework.
表示在过去的某一段时间（six o’clock 以前）已经做完作业，与现在无关。
第八页，本课件共有19页
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.
第九页，本课件共有19页
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!
第十页，本课件共有19页