what past perfect continous tense?

A particular action or an event that had taken place over either a period of time or a point of time in past prior to an event in the past is indicated by the use of past perfect continuous tense.

The sentence structure for past perfect continuous tense:

Subject with the Helping verb Had with Been with the Main verb ending in ‘-ing’+ Object


I had been living here since 1997.

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Past perfect continuous tense shows that the action was going on continuously, and did not complete in the past.

For instance,

I had been working on this project.

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