¶ Where do we use Past Perfect Tense:
Action that completed before an another action in the past.
Example:-

∆ He had already left when I arrived in the party.
∆ They had gone out when you called.
∆ They had eaten the breakfast before I reached.
∆ She had made a cake for her mother’s birthday before she came.

➩ If past time is given in a sentence, the sentence must be in simple past and never in Present perfect tense.
Example :
• I came yesterday.
• I have come yesterday.❌