文档介绍：现在完成时
构成:现在完成时由“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/haven’t studied.
He(She,It)has not/hasn’t studied.
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We(You,They) have not/ haven’t studied.
疑问式：Have I( you ) studied?
Yes, you (I) have./No,you (I) haven’t.
Has he (she,it) studied?
　Yes,he(she,it) has.／No,he(she,it) hasn’t.
Have we(you,they) studied?
Yes, you (we,they) have.
No,you (we,they) haven’t.
(2)动词的过去分词：规则与不规则
你还记得过去式吗？
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请用两个单词分别写现在完成时的肯定句，否定句和疑问句。
I have written my postcard.
I haven’t written my postcard.
Have you written your postcard?
Yes, I have. / No,I haven’t.
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1The room is cold。Who——————（open）the window？
2 He———（go）to the cinema。
3 —you——（put）away my dictionary?
(not finish) the work yet.
(see) the play. I _____(see) it last month with my sister.
am not ____just____(have) my dinner.
’t worry. The train____yet.
’t arrive ’t arrived
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(3) 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 。（窗户是开着的）
The concert has （音乐会现在在进行）
They have gone to （他们不在这里）
现在完成时不能和表示过去的时间状语，如yesterday,last year,in 1980,three days ago
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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 。
I haven’t read it
Have you ever seen each other before?你们见过面吗？
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、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。
We’ve kn