kwa nini

Why with Kwa Nini

Level 1

Kwa nini is the standard Swahili phrase for asking 'Why?'

How It Works

Kwa nini is the most common and versatile way to ask 'why' in Swahili. It literally translates to 'for what' (kwa = for, nini = what).

Here is what you need to know about using it to become confident with Swahili questions:

  • Placement and Word Order: It usually sits at the very beginning of a question. When placed at the beginning, the rest of the sentence follows standard Subject-Verb-Object order without subject-verb inversion. In casual speech, you might also hear it at the end of the sentence (e.g., Umekuja kwa nini? - You came for what?).
  • Answering: To answer a kwa nini question, you typically start your sentence with kwa sababu (because). For example: Kwa nini unasoma Kiswahili? (Why are you studying Swahili?) -> Kwa sababu ninataka kuishi Tanzania. (Because I want to live in Tanzania.)
  • Neutral Tone: Kwa nini is completely neutral and polite. It simply asks for a reason without adding any emotion or judgment.
  • Spelling: Although you will often see it written as one word (kwanini) on social media or in text messages, Standard Swahili requires it to be written as two separate words.

Kwa nini vs. Mbona
Learners often confuse kwa nini with another word for 'why': mbona. While kwa nini is a neutral request for information, mbona carries strong emotion, like surprise, impatience, or disbelief (similar to the English 'How come?!'). Using mbona in a normal situation can accidentally sound rude or confrontational, so stick to kwa nini for standard questions.

Examples (4)

  1. Kwa nini unajifunza Kiswahili?

    Why are you learning Swahili?

    Word by Word: For what you-are-learning Swahili?

    The most standard placement for 'kwa nini' is at the beginning of the sentence.

  2. Kwa nini waliachana?

    Why did they divorce?

    Word by Word: For what they-divorced?

    A neutral request for information about a past event.

  3. Umekuja kwa nini?

    Why have you come? / You came for what?

    Word by Word: You-have-come for what?

    Placing 'kwa nini' at the end of the sentence is common in casual, everyday speech.

  4. Sijui kwa nini.

    I don't know why.

    Word by Word: I-do-not-know for what.

    It can also be used in indirect questions, just like in English.

Common Mistakes

  • Translating 'the reason why' directly from English.

    Hii ndiyo sababu kwa nini niliondoka.
    Hii ndiyo sababu iliyonifanya niondoke.

    In Swahili, 'kwa nini' is a question word. It is not used as a relative pronoun to mean 'the reason why' in a statement. To say 'the reason why', use a relative construction such as 'sababu iliyonifanya niondoke' (the reason that made me leave), or say 'ndiyo maana niliondoka' (that is why I left).

  • Writing it as a single word.

    Kwanini unalia?
    Kwa nini unalia?

    While extremely common in casual texting and social media, Standard Swahili requires 'kwa nini' to be written as two separate words.

How It Connects

Tap a pattern to see what it builds on and what it leads to.

kwa niniLevel 1Why with Kwa Nini

Learn This First

The interrogative 'kwa nini' is a compound phrase formed by combining the multipurpose preposition 'kwa' with the question word 'nini' (what). To use it effectively, a learner should understand these two components and how they fit into basic Swahili sentence structures.

Words in This Pattern

kwa nininini