PAST SIMPLE VS PRESENT PERFECT SIMPLE

http://www.englishpage.com/verbpage/verbs5.htm

http://www.englishpage.com/verbpage/verbs6.htm

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex02

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex03

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex04

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex05

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex06

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex07

https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex08

https://www.ego4u.com/en/read-on/countries/usa/tour/grand-canyon#exercises

https://www.ego4u.com/en/read-on/countries/uk/tour/edinburgh#exercises

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

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect.htm

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect2.htm

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect3.htm

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect4.htm

http://www.perfect-english-grammar.com/past-simple-present-perfect-1.html

http://www.perfect-english-grammar.com/past-simple-present-perfect-2.html

http://www.perfect-english-grammar.com/past-simple-present-perfect-3.html

http://www.perfect-english-grammar.com/past-simple-present-perfect-4.html

http://www.curso-ingles.com/practicar/ejercicios/present-perfect-vs-past-simple

http://www.usingenglish.com/quizzes/228.html

http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/ppvpast1.htm

http://www.agendaweb.org/verbs/present-perfect-simple-past-simple-exercises.html