How to use the tense?Negation: had not been + verb + ing
I had not been walking / I hadn't been walking
You had not been walking/ You hadn't been walking
He had not been walking/ He hadn't been walking
She had not been walking/ She hadn't been walking
It had not been walking/ It hadn't been walking
They had not been walking/ They hadn't been walking
We had not been walking/ They hadn't been walking
You had not been walking/ You hadn't been walking