现在完成进行时.ppt

M2 U1 Grammar and usage
Present perfect tense
Present perfect continuous tense
VS
，但对现在
仍有影响，句中往往没有具体的时间状语.
The disappearance of Justin has made
Kelly very unhappy.
Present perfect tense（现在完成时）
2. 表示从过去到现在反复性或习惯性的动作，常与always, often, frequently, many times, several times等频率副词连用。
I have always walked home.
We have often been there.
Some villages say they have seen UFOs
many times.
, 可能还要延续下去, 谓语动词常常是延续性动词, 常与already, yet, ever, never, just, lately, recently, since, for, before, in the past\ last few days\ years, so far, by now, up to now, these days\ years连用。
We have known each other for two years.
How long have you waited here?
I have taught here in the past 10 years.
The police have searched the area these days.
非延续性动词如: lose, buy, borrow, leave, go, come, begin, start, finish, marry, die等不与表示时间段的状语连用.
他的祖父已经去世了. 他已经去世许多年了.
.
他们02年结的婚, 至今已经7年了.
他和妻子在战争中失去了联系, 至今已经十多年了.
他已经离开家乡30年了.
现在完成时常用句型
在时间和条件状语从句中, 用现在完成时代替一般现在时.
When you’ve learned English, you’ll find it a bridge to learning new things.
If you’ve finished reading it, you will find the book interesting.
2. It is the first\ second\...last time that sb. has done sth.
It’s the first time that I’ve come to Wuxi.
3. This is + + that…从句中用现在完成时.
This is the best book I have ever read.
is/has been + 段时间 since…
It has been ten years since I lived in Shanghai.
Present perfect tense and the simple past tense.（现在完成时和一般过去时）
We haven’t seen Justin for a week.( He is still missing.)
Justin disappeared last week. (Last week we couldn’t find Justin.)
He has smoked since he left school.( he still smokes.)
He smoked for six months last year.( He stopped smoking then.)
Present perfect tense and the simple past tense.
_____________(study) English for about five years. We ______(