过去完成进行时(The Past Perfect Progressive)强调动作从过去的过去开始一直
延续到过去某个
时间点。在过去某个时间点时，这个动作可能刚刚停止，也可能仍然在进行。在英语时态中，“时“指动作发生的时间，”态“指动作的样子和状态。
基本结构
had+been +动词-ing
构成
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。
They had 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。
特别含义
主要特点
He had not practised English for many years．（普通说法）
He had not been practising English for many years．（少见）
这种时态还可用在said，
supposed等引起的
间接引语中，代替
现在完成进行时：
He thought:“She was watching me when I passed．”= He thought that she had been watching him when he had passed．
过去完成进行时经常与现在完成进行时混淆。
现在完成进行时 (The present perfect progressive) 由 have/has been +-ing
分词构成；
过去完成进行时（ The past perfect progressive tenses ）由 had been +-ing 分词构成．
现在/过去完成进行时的用法：
B.表示重复动作的现在/过去完成进行时
我们也可以用
完成进行时形式来表示现在或过去经常重复的动作
注意：过去完成进行时和
过去完成时类似，需要有过去这一时间段
用法
时态比较
过去完成进行时与
过去完成时的用法很相近，它通常表示某个过去正在进行的动作或状态，持续到过去某个时刻，还未完成，一直持续到之后才结束
He had been waiting for two weeks． He was still waiting．（有一个表示一段时间的状语）
他已经等了两个星期。他还在等。
Up to that time he had been translating those books．直到那时他一直在翻译这些书。
He had been writing the letter till two o'clock．他一直在写那封信到两点钟。
He was thirty years old．He had been gambling since he was ten．（He was still gambling at thirty．）
他三十岁。他从十岁开始就一直在赌博。（三十岁的他仍然赌博。）
He had been standing there in the sun．（没有
时间状语）
他一直站在太阳底下。
He had been thinking about his marriage．（没有时间状语）
他一直在对他的婚姻思考。
不过这种时态并不一定表示这个过去动作将持续下去：
He came back at seven．He had been waiting for her two hours．（At seven he did not wait any more．）
他在七点回来了。他等了她两个小时。（在七点时，他不想再等了。）
He stopped swimming．He had been swimming for the last three hours．他停止了游泳。他已经在过去的三小时内游泳。