Past Perfect Continuous
+ had been + verb + ing
had been playing
- had + not + been + verb + ing
hadn’t been playing
? had + Subject + been + verb + ing
How long had he been playing ?
1. An action started and completed (duration!) before a stated time in the past.
Ann had been doing her homework for 2 hours by 6 o clock yesterday.
2. An action started and completed (duration!) before another past action in Past Simple.
He had been packing his suitcase for half an hour before he left the house.
3. An action lasted for some time with visible results in the past.
She was exhausted because she had been travelling all night.
For, since, before, all day/night/etc
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