Past tense
Present perfect refers to a time which begins in the past and continues to the present. Examples: I have lived in  Dover since my birth. She has discovered it. She has done it now! We have seen the movies since 2011Past perfect, or pluperfect, refers to an action before another action in the past. Examples: She had not been home since her parents divorced. I had discovered that he had taken my key. She had begged for the job before the interview.