Present perfect vs simple past

SIMPLE PAST VS. PRESENT PERFECT SIMPLE
https://www.ego4u.com/en/cram-up/grammar/simpas-preper 

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

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

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


Select the right form of the verb in past (includes past participles)
http://a4esl.org/q/h/irv001-ck.html

PRESENT PERFECT

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