https://prezi.com/p/pl8nxgbex5q7/present-perfect-vs-past-simple/ https://www.umimeanglicky.cz/doplnovacka-past-simple-present-perfect-games-2 https://elt.oup.com/student/grammarfriends/level05/tests/test2?srsltid=AfmBOophIAFpEffiYjYCub8QQ9vo 5dS8GJt34iu181OWsCYAFIzafRIz&cc=cz&selLanguage=cs