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I found the following sentence in tangorin.com,

> 台所をこんなに散らかしたのは誰だ。

And it is translated as

> Who's responsible for this mess in the kitchen?

Is it really a question or just a statement? Do we always need to translate it
and end with a question mark (`?`)?
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2016-10-05T11:36:12.677
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question
grammar translation punctuation
Is a sentence ending with 誰だ but without か a question?
It can be a question, or a statement. E.g. consider

```

    A: ものがいっぱいありすぎて全然料理するスペースがないよ。  
    B: 台所をこんなに散らかしたのは誰だ。
    
```

B can say this when both know it's A who littered the kitchen. It's also
spoken without the question intonation if it's used that way. When it's a
question, it's pronounced as a question.
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2016-10-05T12:37:55.243
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"誰" makes it a question. It's similar to "何処（どこ）", "どれ" or "何時（いつ）". For
example, "ここは何処だ。", "正しいのはどれだ。", "飯は何時だ。", all of them are questions. It may
be a rhetorical question but can't be a statement. So yes, you need "?".

In Enno Shioji's example, even when both parties know the answer, it's still
considered as a rhetorical question and it should be translated as such.
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2016-10-05T13:19:44.687
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To me it seems like forceful attempt at finding out who made the mess. Asking
using "誰ですか" almost makes it seem like I'm being inquisitive and asking a
question rather than demanding an answer by using a statement using 誰だ。
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2016-10-05T16:41:20.313
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You don't need a question mark **?** or a particle **か** to make a question,
there are things written, such as dialogs, that are intended to be red with a
conversational context, in such context, just as in English, you can deduct
things based on speaking tones. The person in the sentence is saying the line
with an inquisitive tone(maybe he or she cleaned the kitchen just a while ago
and got disgusted because of the newfound mess), also you can say that it's
being somewhat demanding and even maybe talking to somebody with equal/lower
status because of the informality of the sentence end.

Give a try reading it imagining the past moments, as if it was an English
dialog of a comic or the kind.
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2016-10-06T01:45:48.090
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* Is it really a question or just a statement?   
It is a question, it is not a statement.  
Formally you should say 誰ですか, but informally you can say 誰だ.  

  * Do we always need to translate it and end with a question mark (?)?  
Since it is a question, the translation needs to end with a question mark.
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answer