Point 22 in the category of PAST is defined as: present perfect simple with ‘already’ to emphasise that something is done, often before the expected time. FOR EXAMPLE: He is the most joyful person that I have ever met, and in just over a year, he has already made the world a better place. A search in iWeb for: _VHZ already _VVN 1 HAS ALREADY BEGUN 7505 2 HAS ALREADY MADE 6871 3 HAS …
You can give background information in a past perfect simple relative clause. For example:
The people WHO ATTENDED the lecture knew about the test.
The teachers WHO HAD DEVELOPED the test explained what to study the night before.