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选修8《Learning about Language》PPT课件优质课下载
The young boy has been watching TV.
The two robots have been dancing and singing since they have been made.
They has been playing games in the school.
I have been knocking. I don’t think anybody’s in.
has﹨have been doing
The baby has been sleeping for an hour.
They have been playing basketball all the day.
The girl has been reading a book for 3 hours.
The young boy has been watching TV.
The two robots have been dancing and singing since they have been made.
They has been playing games in the school.
Play games
现在完成进行时
构成形式：
has﹨have been doing
1, 叙述某一动作从过去开始一直继续到现在仍在继续之中或刚刚停止。经常与for, since, all morning/day/week用在一起。
1) You have been studying for four hours. Why don’t you take a break?
2) The telephone has been ringing for almost a minute. Why doesn’t someone answer it?
I have been teaching in this school since 2005.
2, 带有浓厚的感情色彩，强调持续了“那么久”或做得“那么辛苦”
1) Oh, you have come at last! I have been waiting for you for two long hours.(我等了你足足两个小时)
2) You are here! I have been looking for you for a long time.（我找了你老半天）
3.表重复。叙述从过去某时到现在或最近已在重复的动作。
I have been writing a book since last year.(我从去年就一直在写书)
Mary has been feeling really tired.