UNIT 1 The Changing World TOPIC 1 Our country has developed rapidly Section A--现在完成时.ppt

1、UNIT 1 The Changing World TOPIC 1 Our country has developed rapidly Section A-现在完成时 The Present Perfect Tense,现在完成时 （1）构成:现在完成时 “have/has+ 动词的过去分词”构成。,现在完成时的肯定式、否定式和疑问式及简单回答形式（以动词study为例）： 肯定式: I (You) have studied. He (She, It) has studied. We (You, They) have studied.,否定式: I (You) have not/havent

2、studied. He (She, It) has not/hasnt studied.,疑问式：Have I (you) studied? Yes, you (I) have./No, you (I) havent.,（2）用法 a.表示过去发生或已经完成的某一动作对现在造成的影响或结果。例如： I have opened the window.我已经把窗户打开了。（窗户是开着的） The concert has started.音乐会已经开始（音乐会现在在进行） They have gone to Shanghai.他们已去上海了（他们不在这里）,【注意】不能与表示过去的时间状语连用，如y

3、esterday, last year, in 1980, three days ago, just now, when I came in等连用。但可以和一些不确定的时间状语，如already, yet sometimes, often, before, lately, once, never, just, ever等连用；也可以和包括现在在内的时间状语，如this morning, today, this week, this year等连用。,例如: She has already come.她已经来了。 I havent read it yet.我还没有读过这个 Have you ev

4、er seen each other before?你们见过面吗？,b.表示过去已经开始、持续到现在（也许还会继续进行下去）动作或状态，常和表示一段时间状语，如:today, these days, since,for,this month, now等连用。,例如: I have studied English for two years. 我学英语已经两年了。 They have lived in Beijing since 1980. 他们自1980年就一直住在北京。 Weve known each other since we were children.我们从小就认识。,现在完成时与瞬

5、间动词,瞬间动词可以用于现在完成时，但不能和表示一段时间的状语连用。如可说“He has left.”但不能说“He has left for three years.” 如果要表达“他已走了三年了”可用以下几种表达法：,一、用ago,使用一般过去时。 He left here three years ago.,二、用“It is +一段时间since 一般过去时从句 ” It is three years since he left here.,三、用“ 一段时间have/ has passed + since + 一般过去时从句 Three years have passed since

6、he left here.,( )1.Youve never seen such a wonderful film before, _? A. havent you B. have you C. do you D. dont you ( ) 2. I have watched the game. When _ you _ it? A. have; watched B. do; watch C. did ;watch D. will; watch,B,C,Practice,( )3. Mr. Green _ in China since five years ago. A. lived B. has lived C. lives D. is going to live ( )4. His g