6º: Unit 6, present perfect or past simple?

First, let´s revise the theory:

https://www.perfect-english-grammar.com/present-perfect-or-past-simple.html

Some links to practice:

https://www.examenglish.com/grammar/b1_presentperfect_pastsimple.htm

https://www.test-english.com/grammar-points/b1/past-simple-present-perfect/

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

https://speakspeak.com/english-grammar-exercises/intermediate/past-simple-or-present-perfect

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

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

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

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

https://www.flo-joe.co.uk/preliminaryenglish/grammar/present-perfect-or-past-simple.htm
(the exercises are after the explanation)