http://esl.fis.edu/grammar/quiz/3.htm
http://www.perfect-english-grammar.com/past-simple-present-perfect-1.html
https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises
http://www.englishpage.com/verbpage/verbs5.htm
http://www2.arnes.si/~osljjk6/anglescina/grammar/past_simple_present_perfect_s.htm