No a question per se, but I wish we could encourage people who ask questions like: "Why is にゃにゃにゃ good and にゃにゃにゃ wrong?" to give a source for their sample sentences. It may happen that the person asking the question has crafted a bad example, or that the source is someone with bad grammar, a bad book or something else.
At least, in the wrong case, even the beginner knows it is likely to be wrong, but in the right case, it may actually not be right at all. A quote from a novel, newspapers or a text book something else is much likely to be correct by design. Still, mangas or animes may have some weird sentences too that beginners are likely to consider "correct" while they are not on purpose (and the Japanese reader/viewer or advanced learner would notice that).
So, how to politely and automagically ask "did you create this sentence" or "where did you take that from"? Editing the question and asking for references? Adding a "reference-needed" tag? Commenting the question?