past perfect past simple

https://www.ego4u.com/en/cram-up/grammar/simpas-pasper


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

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

https://www.ego4u.com/en/cram-up/grammar/past-perfect-simple/exercises

http://www.really-learn-english.com/past-perfect-exercises.html

Javier

https://elt.oup.com/student/solutions/preint/grammar/grammar_09_012e?cc=ar&selLanguage=en

http://www.curso-ingles.com/practicar/ejercicios/past-perfect