The particle "か" (ka) is used with phrases to indicate questions, or with nouns to indicate a list of alternatives.
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Use of ～のか (～んですか) in questions not seeking a yes/no answer
I would like to know if there is a shift in nuance in questions such as these:
誰が参加したんですか。 vs. 誰が参加しましたか。
いつ着いたんですか。 vs. いつ着きましたか。
I wish to limit discussion to only non-yes/no questions ...
