PAST PERFECT CONTINUOUS

If you want to know more about this tense, check my Instagram post:

https://www.instagram.com/p/C5m9CjoO_We/?igsh=c3YyMmhnNGphdzU5

Now practice with the following exercises:

https://www.really-learn-english.com/past-perfect-progressive-exercises.html#01

https://www.examenglish.com/grammar/past_perfect_continuous.htm

https://www.grammarbank.com/past-perfect-progressive.html

https://www.englishclub.com/grammar/verb-tenses_past-perfect-continuous-quiz.php

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

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