What is the formula for Past Perfect Tense.

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https://www.meritnation.com/cbse/class7/studymaterial/english/english-grammar/tenses/30_435_1629#slide6_the-perfect-tense

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Past Perfect Continuous Tense S + had been + V + ing + O + since/for
E.g. We had been writing a letter since morning.
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the past tense of the verb to have (had) + the past participle of the main verb.
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