He had been eating an apple .
Had he been eating an apple?
He hadn't been eating an apple
She had been working.
Had she been working?
She hadn't been working.
They had been talking .
Had they been talking?
They hadn't been talking.
I had been studying .
Had I been studying?
I hadn't been studying.
James had been teaching .
Had James been teaching?
James hadn't been teaching.