Thank you for this. I wasn't aware yet, by my own fault, that there were different noun classes. How cool Is there a good way of learning which class certain nouns are?
Now I see why Duolingo said I had missed a space, with my "Goodnight, Rehema". It's not the greeting, like "good afternoon" or "good evening", but it seems to express the hope that Rehema will have a good night.