By nine o’clock last night, we had got 200 pictures from the spaceship.
I had been at the bus stop for 20 minutes when a bus finally came.
动词think, want, hope, mean, plan, intend等用过去完成时来表示过去未曾实现的想法，希望，打算或意图等：
They had wanted to help but could not get there in time.
过去完成时还可用在hardly…when…, no sooner…than…, It was the first (second, etc) time (that)…等固定句型中。
Hardly had he begun to speak when the audience interrupted him.
No sooner had he arrived than he went away again.
It was the third time that he had been out of work that year.