had been + present participle
I had been working at the hospital for two years when the trouble started.
I had been
You had been
She had been
He had been
They had been
We had been
It had been
I’d been working at the hospital for two years when the trouble started.
The past perfect continuous is similar to the past perfect, except that it expresses longer actions in the past before another action in the past.
She had been waiting for nearly an hour when the bus finally arrived.
He had been working at the bank for a year before he left for the United States.
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