"Why are you tired?"
Translation:Kwa nini umechoka?
So usually nini goes at the end of the sentence I thought, why is it placed this way here?
"What" and "who" generally go in the sentence in the same place as their answer would go. Kwa nini and mbona generally go first. Lini and vipi usually come straight after the verb.
Then it would be, You are tired why? -|- Umechoka kwa nini? It can work but then it sounds backwards.
There is a pro explanation somewhere. Misschien(maybe) someone will jump in and explain.