过去完成进行时

1. 过去完成进行时的形式
had been + 现在分词

2. 过去完成进行时的用法
1) 表示持续到过去某时的一个动作
* We had been waiting for him for about an hour by the time he came. 当他来的时候，我们等他有一个小时了。
* How long had it been raining after he left home? 在他离开家后，雨下了有多长时间了？
* She said that she had been listening to radio after school. 她说她放学后一直在听收音机。
* She had been studying for two hours when her classmate came to visit her. 当她的同学来看她的时候，她学习有两个小时了。
* She had been suffering from a bad cold when she took the exam.她在考试之前一直患重感冒。
* Had they been expecting the news for some time? 他们期待这个消息有一段时间了吧？
* Rafael was scolded even though he hadn't been doing anything wrong. 尽管拉斐尔没做什么错事，但他还是挨骂了。
* I had been looking for it for days before I found it. 这东西我找了好多天才找着的。

2) 这个时态常用于某些从句中
* The doctor asked what he had been eating. 医生问他吃了什么。
* I asked where they had been staying all those days.我问他们那些天是呆在哪儿的。
* They received the parcel that they had been expecting for a long time.
他们收到了他们期待已久的包裹。