past perfect progressive - form
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how you build the past perfect progressive:
positive and negative statements:
had + past perfect form of “be” + present participle
–> had + been + infinitve + -ing
e.g. I had been working.
He had been working.
You hadn’t been swimming.
They hadn’t been swimming.
questions:
The auxiliary verb “had” is swapped by the subject and is put at the beginning of the question.
e.g. Had I been working?
Had you been working?
Hadn’t he been swimming?
Hadn’t we been swimming?