to be simple past

https://agendaweb.org/verbs/to-be-past-exercises.html
https://www.englisch-hilfen.de/en/exercises/tenses/was_were.htm
https://www.ego4u.com/en/cram-up/grammar/simple-past
https://learnenglishkids.britishcouncil.org/grammar-practice/past-simple-verb-be