Question

Hey Friends!!!
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Please provide me details about past perfect tense.
Have a good day!

Answer 1

subject + had + been + third form of verb
this is use when work finish in past

Answer 2

The PAST PERFECT TENSE indicates that an action was completed (finished or "perfected") at some point in the past before something else happened. This tense is formed with the past tense form of "to have" (HAD) plus the past participle of the verb (which can be either regular or irregular in form):I had walked two miles by lunchtime.I had run three other marathons