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外研2003课标版《Grammar》集体备课PPT课件优质课下载
has seen
has visited
has been
have been put up
has just bought
表示动作发生在过去，
强调过去的动作对现在的影响。
present
past
future
肯定句：
否定句：
疑问句：
被动句：
have/has + S +done
S + have/has not done
S + have/has done
S + have/has +been done
-- Has the boss left yet?
-- Yes, he has.
leave
yet
Describe the picture in the Present Perfect Tense with the words given
yet
do your homework