Asante sana rafiki! I am trying to find more errors or missing hints in extra sentences for every skill before to pass through the last checkpoint. I also know some users have made reports in the whole course so I will be concentrating in the basic and intermediate sections of the tree. And I know the last section will be highly enjoyable! =)
The -ni suffix basically means the "to" in "going to" (ninaenda dukani, for example), or "in/at", (niko dukani, for example).
Duka would refer only the physical structure of the shop, while Dukani refers to it as a place. Its the same with Nyumba and Nyumbani - Nyumba is the physical structure of a house, while Nyumbani is refering to thd house as an actual place