Here are a few other ways to say "why" in Swahili, depending on the context:
* "Sababu gani?" (What is the reason?)
* "Nini sababu?" (What is the reason?)
* "Mbona?" (Why? - informal)
Examples:
* Kwa nini umechelewa? (Why are you late?)
* Sababu gani unalia? (What is the reason you are crying?)
* Mbona huja kuniambia? (Why didn't you tell me?)