7.3.- Past perfect and past perfect vs past simple

 Past perfect introductory video

Past perfect chart

More past perfect in songs video

Exercises on page 56

Past perfect online exercise

https://www.perfect-english-grammar.com/past-perfect-exercise-1.html

Past perfect vs past simple chart

Collaborative online exercise

https://www.perfect-english-grammar.com/past-perfect-exercise-3.html

Past perfect vs past simple online exercise

https://www.englisch-hilfen.de/en/exercises/tenses/past_perfect_simple_past.htm