Past Perfect Simple

Form

had + V3

Use of Past Perfect

  • action that had occurred before a certain time in the past / that had already been completed when the other actions occurred.
    (putting emphasis only on the fact, not the duration)  

            When (until) I came in they had already finished their work.

Signal Words

  • already, yet, just, never, once, until that day, by the time, until then, for, since,  recently, lately(in reported speech). 

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