NÜTZLICHE LINKS:

https://www.english-4u.de/en/grammar/present-perfect-simple.htm

https://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_statements2.htm

https://agendaweb.org/verbs/present_perfect-tense-exercises.html

https://www.englishclub.com/grammar/verb-tenses_present-perfect_quiz.htm

https://www.really-learn-english.com/present-perfect-exercises.html

https://games4esl.com/english-exercises/english-grammar-exercises/present-perfect-exercises-3/

ÜBUNGEN ZU IRREGULAR VERBS:

https://www.englisch-hilfen.de/en/exercises/irregular_verbs/fill_in.htm

https://www.englisch-hilfen.de/exercises_list/verbs.htm

GAMES:

https://www.gamestolearnenglish.com/perfect-tense-game/

https://www.mes-games.com/animals4.php