|Affirmative Form||Subject + had + been + verb(ing)...|
I had been studying English.
|Negative Form||Subject + hadn't + been + verb(ing)...|
I hadn't been living in poverty.
|Question Form||Had + subject + been + verb(ing)...?|
Had she been sleeping?
|Negative Question||Hadn't + subject + been + verb(ing)...|
Hadn't they been waiting for you?
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