日語 Japanese Ask Questions Thread2 質問

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Japanese - Ask questions thread
http://dis.4chan.org/read/lang/1174719097/l50

>>972
That is the same form and all. I understand how to use の＋です
but I think we're talking about two different things here. I wouldn't be surprised if it's just derived from that form and modified to make it a request though, but I'm pretty sure that the way it is supposed to work is different

You hear it when for instance, you see someone running away, and you yell, "待つんだ！" or "Stop!" to get them to do so.
However, it doesn't really make sense with the original の＋です meaning.

You could say お前が野菜を食べるんだ to a person who won't eat his vegetables.