SUPPORT PAGES WAS/WERE

https://www.papora.com/es/guia-gramatica-inglesa/was-were/

https://www.language-worksheets.com/support-files/elementarywaswereexercises.pdf

https://www.grammarbank.com/was-or-were-exercise.html

https://www.englishexercises.org/makeagame/viewgame.asp?id=562