https://www.englisch-hilfen.de/en/exercises_list/verbs.htm
https://www.perfect-english-grammar.com/irregular-verbs-exercise-1.html
https://www.perfect-english-grammar.com//irregular-verbs-exercise-2.html
https://www.english-4u.de/en/crosswords/past-forms.htm
https://www.english-4u.de/en/crosswords/past-participles.htm
https://www.ego4u.com/en/cram-up/grammar/irregular-verbs