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选修8《Learning about Language》集体备课PPT课件优质课下载
1.构成形式：
has﹨have been doing
2.用法
1, 叙述某一动作从过去开始一直继续到现在或者在继续之中，经常与for, since, all morning/day/week在一起。
1) You have been studying for four straight hours. Why don’t you take a break?
2) The telephone has been ringing for almost a minute. Why doesn’t someone answer it?
The baby for hours.
has been sleeping
2.叙述从过去某时开始一直继续到现在，但不再继续下去的事情。－－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 long.（我找了你老半天）
Oh,my god!You .
(你一直在哭)
have been crying
3.叙述从过去某时到现在，或最近，一再重复的动作。
I have been knocking. I don’t think anybody’s in.(我一直在敲门。我想没人在里面。)
I have been writing letters since breakfast.(我从早餐起就一直在写信)
I don't know why the pig
.
has been running
结论: 现在完成进行时主要用于表示
A. 过去开始而且现在仍在进行的动作。
B. 带有感情色彩。
C. 最近一再重复的动作。
In pairs, take turns to read the statement and turn it into a question using the present perfect continuous tense. The words in brackets may help you. (P41)