PAST SIMPLE AND CONTINUOUS
https://learnenglish.britishcouncil.org/en/quick-grammar/past-continuous-and-past-simple
http://www.perfect-english-grammar.com/past-simple-past-continuous-exercise-1.html
https://www.ecenglish.com/learnenglish/lessons/past-simple-vs-past-continuous
https://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex07
https://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex08
USED TO
http://www.perfect-english-grammar.com/used-to-exercise-1.html
http://www.perfect-english-grammar.com/used-to-exercise-2.html
https://elt.oup.com/student/solutions1stedition/int_unit_page/unit2/grammar/exercise2?cc=bg&selLanguage=bg
