I'm trying to figure out if question words need particles. For example

```

    なぜ　(should there be a particle here?) にほんご　を　べんきょうしますか？
    Why study Japanese?
    
```

Should there be a particle after なぜ? If so which one? If no particle is needed
could you say why that is.

Thanks.
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2014-11-26T12:39:48.987
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2014-11-26T15:04:38.640
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question
particles
Do all words need a particle?
You're asking multiple questions.

  1. Do all words need a particle?  
A: Of course not. Verbs such as べんきょうします, and many others, appear without a
particle.

  2. Should there be a particle after なぜ?  
A: If "should" means "is required", then no.

  3. If no particle is need, why?  
A: It's difficult to give the reason why something is **not** the case.
Particles fulfill certain grammatical functions, such as marking case,
syntactic relationship, etc., or pragmatic functions, such as speech acts
(questions, requests, etc.), or illocutionary force (～よ, ～ね, etc.), etc. なぜ is
an interrogative adverb, and hence appears without a particle.

Also note that some, but not all, particles can be dropped in casual speech.
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answer