Допоміжні дієслова: had (форма дієслова to have) + been (форма дієслова to be)

Головне дієслово: Ving

Позитивне: Суб'єкт + had + been + Ving + ...

I had been walking the dog.She had been studying math.

Негативне: Суб'єкт + had + not + been + Ving + ...

I hadn't been walking the dog.She hadn't been studying math.

Запитання: Had + суб'єкт + been+ Ving + ... ?

Had you been walking the dog?Had she been studying math?

Відкрите запитання: WH part had + суб'єкт + been + Ving + ... ?

Where had you been walking the dog?Why had she been studying math?