过去完成进行时与过去完成时的区别

以往进行进行（The Past Perfect Progressive）相对性以往的某一時刻而言早已对如今有立即危害而且还要开展的姿势。

比如：

He had been waiting for two weeks. He was still waiting for.（有一个表达一段时间的状语）

She had been suffering from a bad cold when she took the exam.她在考题以前一直患发烧感冒。

但是这一时态并不一定表达这一以往姿势将不断下来：

比如：

She came back at six. She had been waiting for him three hours.（六点时她早已沒有再等了）

而过去完成时（The Past Perfect Tense）表达以往某一时间或姿势之前早已产生或进行对以往的某一点导致的某类危害或者結果。它表达姿势产生的时长“以往的以往”，偏重于事儿的結果。

比如：

I had finished reading the book by ten o'clock last night到昨天晚上10点钟，我早已念完了这这书。

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