Past Perfect Continuous является эквивалентом Present Perfect Continuous для прошлого.
Мы употребляем Past Perfect Continuous, когда хотим показать, что процесс начался в прошлом и уже длился сколько-то времени на тот момент в прошлом, о котором идёт речь. Не важно, был ли процесс на тот момент завершён или он всё ещё продолжался потом.
Примеры
Yesterday I had a problem with my task. It was difficult to find the answer on the Internet. I had been browsing websites for an hour when I finally found a forum thread where my problem was described.
Nancy got a job last week. She had been looking for a job for the last two month.
At eleven o'clock we noticed that we had been playing that game for five hours. But we didn't stop and continued playing.
It had been raining since Monday. Now it was Thursday and it seemed like the rain wasn't going to stop.
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