Present perfect is in the present and is relevant to the here and now; whereas, past perfect is in the past but is still relevant to the topic at hand. Present perfect uses the auxiliary has/have = has/have + verb-ED/EN. Past perfect uses the auxiliary had = had + verb-ED/EN. EX: Present Perfect I have danced for 6 years now. EX: Past Perfect I had danced for 3 years before they asked me to be the lead in the show. Hope this helps! Good luck with your studies! Don't hesitate to ask any other questions. :)

Present perfect for an action that has happened in the past (before now Example: I have eaten there before; I have always enjoyed his company; I have finished my homework [the exact time of the action cannot be mentioned, as it may with the simple past]. Past perfect for an action that occured before another related past action: Example: I had eaten before they arrived; I had always enjoyed his company before he insulted me; I had finished my homework by the time my favorite TV show came on.