Past perfect = PLUSKVAMPERFEKTI = What had happened?
https://www.grammarism.com/past-perfect-exercises/
https://agendaweb.org/exercises/verbs/past-perfect/write-1.htm
https://agendaweb.org/exercises/verbs/past-perfect/exercise-1.htm
https://www.focus.olsztyn.pl/en/exercises-past-perfect-test-1.html
NOTICE! In this exercise you need to use both simple past and past perfect within each sentence!
eg. When I came home, dad had already made dinner.
eg. When I came home, dad had already made dinner.