Некий период в прошлом и в нем происходил какой-то процесс had been + ing.

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Процесс в прошлом идущий в течении некоторого периода:
Субъект + had been + -ING глагола

Selected verb:

123+ ing+ sIrregularru
workworkedworkingworksNoработать

I had been working   Change verb

He had been working

She had been working

It had been working

You had been working

We had been working

They had been working

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