1. 表示“持续”
即表示一个从过去某时开始一直持续的动作,这动作可能刚刚停
止,也可能还在进行。
eg. 1)The children have been having a lot of fun.
孩子们一直玩得很开心。
2)She is very tired. She has been working all morning.
她很累。她干了一早晨了。
3)The tobacco industry has been trying to improve its image.
烟草行业一直在试图改善其形象。
二 . 现在完成进行时的用法
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