Present Perfect
Extra oefenen met 'Present Perfect':
https://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?03
https://www.english-at-home.com/grammar-present-perfect/
https://www.montsemorales.com/gramatica/PresPerf1.htm
https://www.english-grammar.at/online_exercises/tenses/t087-present-perfect-tense.htm
http://www.nspeak.com/newbasic/grammatica/presperfect.htm