LINKS TO PRACTICE

http://www.ego4u.com/en/cram-up/tests/present-perfect-simple-3
http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect.htm
http://www.ego4u.com/en/cram-up/grammar/simpas-preper/tests?test1
http://www.perfect-english-grammar.com/past-perfect-exercise-3.html
https://english.lingolia.com/en/grammar/tenses-comparison/simple-past-past-perfect/exercises