Since during speech, the voice in Klingon is "colored" (I'm using the word we use in Greece, because I don't know the english word), as it is in english (to express anger/frustration/sadness), then probably a noun followed by a question mark, would probably be understood in Klingon as being a question.

In English, the word for this is tone. When one asks a question, whether the utterance is phrased as one, one usually uses a rising tone at the end.

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SuStel
http://trimboli.name