"Kati can't hear."
Translation:Kati nem hall.
Nem means "no" or "not". Nincs means something doesn't exist or there isn't any of it. Also, you can think of it as nincs= "nem van" (nem van is NOT said in Hungarian).
Wouldn't "Kati nem hall" be better translated as "Kati doesn't hear"? I answered "Kati nem tud hallni", but this wasn't accepted.