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

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

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

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

https://breakingnewsenglish.com/2103/210309-animal-ears-0.html