Present Perfect:
1 I have just had my lunch.
2 The Smiths have left for Majorca.
3 My sister has never seen a kangaroo.
4 I have never milked a cow.
5 Our grandparents have already moved to a new house.
Past Perfect:
1 They had left the office by 7 p.m. yesterday.
2 She had phoned him twice before she decided to text him.
3 Our guests had arrived by that time.
4 This house had been built by 2018 = They had built this house by 2018.
5 They had repaired my car by last Friday.
