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.