Have been doing 是过去完成进行时 意思说过去发生的,一直到现在都在发生
比如 他们一直在造一座桥.
They have been building a bridge
桥直到现在还在建 没有建完
你如果你说
They have built a bridge.
他们造了一座桥
是现在完成时,相对现在这个桥已经建完了,动作已经停止了
现在完成进行时的谓语动词构成 I/ we/ you/ they have been doing sth.he/ she/
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