ONLINE EXERCISES PRESENT PERFECT VS PAST SIMPLE
https://www.ego4u.com/en/cram-up/grammar/simpas-preper/tests?test1
https://www.ego4u.com/en/cram-up/grammar/simpas-preper/tests?test2
https://www.ego4u.com/en/cram-up/grammar/simpas-preper/tests?test3
https://www.ego4u.com/en/read-on/countries/uk/tour/edinburgh#exercises
https://www.ego4u.com/en/read-on/countries/usa/tour/grand-canyon#exercises
https://www.englishpage.com/verbpage/verbs5.htm
https://www.esl-lounge.com/student/grammar/2g11-past-simple-present-perfect-gap-fill.php
https://speakspeak.com/english-grammar-exercises/intermediate/past-simple-or-present-perfect
https://speakspeak.com/english-grammar-exercises/intermediate/past-simple-or-present-perfect
https://www.perfect-english-grammar.com/past-simple-present-perfect-4.html
https://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/upperf2.htm
http://www.adelescorner.org/grammar/pres_perfect/pres_per_vs_past_simple.html
http://www.spraz-ila.de/grammar/ppspquiz1.htm
https://www.english-grammar.at/online_exercises/tenses/t108-present-perfect-past.htm
https://www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect2.htm