The past perfect tense is formed by using the auxiliary verb "had" followed by the past participle of the main verb. In this case, the past participle of "hide" is "hidden," so the past perfect tense is "had hidden."
The past perfect tense is used to describe an action that was completed before another action in the past. For example, "By the time we arrived, the thief had hidden the stolen goods." Here, the action of hiding the stolen goods was completed before the arrival of "we."
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