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译林2003课标版《Grammar and usage(1)： Present perfect tense》集体备课PPT课件优质课下载
3.这次事件引起了公众的极大兴趣。
Police in America have stepped up their search for a fifteen-year-old boy.
I have not seen Justin since last Friday night.
This incident has received great interest of the public.
Detective Sam Peterson, who has taken charge of the case, told journalists…
So, while we have not dismissed the idea, we are looking into other possibilities as well.
4.负责这一案子的侦探桑姆. 彼特逊告诉记者...
5.所以，尽管我们不排除这一想法，但是我们也在调查其它的可能性。
现在完成时的构成：
Summary:
(肯定形式) :
(否定形式) :
(疑问形式)：
S + have not/has not + done+…
Have/Has + S + done +…
S + have/has + done +…
We ___________________(already open) the window.
过去的动作: we opened the window.
对现在的影响: The window is open.
have already opened
How to use present perfect tense?
Situation 1
The boys are tired. They ________________
(just play) a ball game.
过去的动作 : The boys played a ball game.