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Past-Perfect Progressive Verb Tense
Past-perfect progressive verbs express continuing actions that ended at some point in the past or that ended before another past action.
The past perfect-progressive tense is created with the auxiliary verbs
had been plus a present participle (verb with an ing ending).
I had been studying last night in the library when the fire alarm went off.
Susan and Jacob had been working on their project earlier.
Leo had been jogging regularly, but he stopped because the weather
Scientists had been researching a cure for the disease, but their funding ran
The children had been playing tag when their parents called for them.