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I meant か is necessary not only for an indirect "yes-no" question but also for an indirect "what, which, who, when" question by "an indirect open-ended question" (I added "indirect" in my previous post probably while you were replying)." か is necessary also for an open-ended question" you mean as an ending particle.
The way I understood it, the speaker is asking the person is asking "Have you decided on which movie to see?" Wouldn't the answer be yes or no in that case since the speaker isn't asking which movie is going to be seen?
Nope, it wasn't I was hoping for some more explanations .Just to clarify Toritoribeさん's response (though it might already be clear to you)...
Really, you'd use 何 as part of the affirmative sentence? I would've thought:Actually, whether the full sentence ending in の is a question ("Have you decided which movie you're going to see?") or a statement ("I've decided which movie I'm going to see.") is unclear and would have to be determined by context/intonation. (If it's a statement, it would indicate a feminine speech style, as I mentioned in the other thread about の/ん)
But why does it matter what the embedded question is if the whole sentence is to be answered by a yes/no answer? Can you expand on your explanation?The embedded question (question within the sentence) is "which movie are you going to see", which is not a yes/no question.
Where is the "which" in your version of the sentence?Really, you'd use 何 as part of the affirmative sentence? I would've thought:
今日は何の映画を見るか決めたの
Would've been better in the affirmative: "I've decided which movie to see."
I'm not quite sure what you're asking here. It's not a matter of what "matters", I was simply clarifying why your initial interpretation of か marking a yes/no question was incorrect by pointing out that the か is not marking the yes/no question "Have you decided...?", but rather goes with the embedded Wh-question "Which movie to see?"But why does it matter what the embedded question is if the whole sentence is to be answered by a yes/no answer? Can you expand on your explanation?
As bentenmusume-san pointed out, there is no "which" in 今日は映画を見るか決めたの. This is an indirect speech "Have you decided if you see a movie or not?" or "I've decided if I see a movie or not." か is necessary whether the sentence is a question or statement. かどうか(を) would be more natural, though.I would've thought:
今日は何の映画を見るか決めたの
Would've been better in the affirmative: "I've decided which movie to see."