write the rule of present perfect tense is changed into past perfect tense
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Explanation:
In the perfect tenses, the verb (to) have is always the auxiliary verb. In the present perfect tense, the main verb is in the past participle form. This is not difficult for regular past tense verbs. For regular verbs, the past participle form of the verb is the same as the past tense verb, so you just add -ed!
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