Past perfect simple or continuous

Here you have some links to practice past perfect simple and continuous, organised by difficulty:


http://www.myenglishpages.com/site_php_files/grammar-exercise-past-perfect.php

https://elt.oup.com/student/solutions/upperint/grammar/grammar_02_022e?cc=global&selLanguage=en

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-9553.php

http://speakspeak.com/english-grammar-exercises/upper-intermediate/past-perfect-simple-vs-past-perfect-continuous

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

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

http://www.englishpage.com/verbpage/verbs13.htm