语 境 自 主 领 悟
先观察原句
后自主感悟
①We've been excavating here for many years and...
②We have been excavating layers of ash almost six metres thick,which suggests that they might have kept the fire burning all winter.
③Well,we've been finding the bones of tigers and bears in the caves,and we think these were their most dangerous enemies.
④He has been writing a novel,which will be finished next month.
⑤He has written a novel,which is being prepared to come out now.
1.由句①②③看出现在完成进行时的构成形式为:have/has+been+doing。
2.比较句④⑤,现在完成进行时强调动作未完成;而现在完成时强调动作已经结束。
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