-んだ casual form


I learned that the short form for な-adjs and nouns is だ, but I also learned
that usually you wouldn't end a sentence with だ (usually it is dropped).

So when it comes to a sentence that ends with -んだ, would you drop the だ here
too?

e.g. きのう、たべすぎるん。 vs きのう、たべすぎるんだ。




In that case の as in のだ is not contracted into ん in Standard Japanese, in
short, you say たべすぎるの.




In that case の as in のだ is not contracted into ん in Standard Japanese, in
short, you say たべすぎるの.

