Die sind Tassen?
Duolingo asked me to translate "Those are cups." but when I typed "Das sind Tassen." it tells me that's wrong and it should be "Die sind Tassen." I don't understand how that works, I thought maybe 'that/these' changes from das to die if it's plural, but I got the phrase "Das sind die letzten zwei Orangen." which is plural but uses das.
Trust me: Duolingo is wrong in "Die sind die Tassen" Use feedback. If you haven't done that already, use the feedback button in the left margin. Describe the situation and tell them it should be: "Das sind die Tassen."