Student or Learner
Present Perfect Tense and Past Perfect Tense?
please share some examples
I have lived here since 1998.
John has been working too hard. He looks exhausted.
We use the past perfect when we are relating a situation that happened or started in a past time to a later past time.
When he left in 1998, he had lived there for over twenty years.
When I saw John last week, he looked exhausted. He had been working too hard.
Please use your title as a title, and put the question in full in the text of your message. Also, 'Present/Past Perfect difference' would have been a more helpful title.