has been doing与had been doing,这两个时态分别代表怎样的概念,表示怎样的动作发生,用于何种情

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：英语作业时间：2024/07/22 19:18:15

has been doing与had been doing,这两个时态分别代表怎样的概念,表示怎样的动作发生,用于何种情况,请大家分别具体解释一下它们所用的场合

has been doing表示动作到现在为止一直在做
I have been waiting for you for an hour.
had been doing表示动作到过去某一时刻为止一直在做
I had been waiting for you for an hour until you finally reached.

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