"We had books."
Translation:Tulikuwa na vitabu.
yeah, that is definitely not something we would know without it being introduced to us! When there is something weird/different like this, it should always be first given to us in the Swahili with the English translation, rather than us trying (impossibly!) to just know what to put down! I am not sure if there is an algorithm to these lessons that mixes them up randomly, but if there's not, then it should go in the order where we have the translation given to us first, before we try to write it in Swahili!
CeeCeeSong it is in the lesson material for this section. https://www.duolingo.com/skill/sw/Past-Tense/tips-and-notes If you're using the mobile app, I think the only way to get to these is to open Duo in the browser.