Present Perfect VS Past Simple

Hi there!
I leave you some links to work on the contrast between Present Perfect and Past Simple:

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

Leave me a comment down below when you finish. Good luck!!!