WAS / WERE

http://www.eslgamesplus.com/was-were/

https://learnenglishkids.britishcouncil.org/es/node/14107

http://www.grammar.cl/english-games/was-were.htm

https://www.funbrain.com/verb/

http://www.slideboom.com/presentations/520810/ESL-Interactive-Games-(was-were)