2. 表示反复的动作。

He had been mentioning your name to me. 他过去多次向我提到过你的名字。

3. 过去完成进行时还常用于间接引语中。

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. 我问他们那些天呆在哪儿。

4. 过去完成进行时之后也可接具有"突然"之意的when分句。

I had only been reading a few minutes when he came in. 我刚看了几分钟他就进来了。

She'd only been reviewing her lessons for a short while when her little sister interrupted her.

她温习功课才一会儿，她妹妹就打断她了。

(三)过去完成进行时和过去完成时的比较:

She had cleaned the office, so it was very tidy.

她已经打扫过办公室了，所以很整洁。 (强调结果)

She had been cleaning the office, so we had to wait outside.

她一直在打扫办公室，所以我们不得不在外面等着。 (强调动作一直在进行)

二、将来完成时

(一)构成：will/shall have +过去分词

We hope it will have stopped raining before we set off for the picnic.

我们希望在出发去野餐以前雨就已经停了。

I'll have done all the work by the time you are back this evening.

你们今晚回来的时候我就将做完所有的工作了。