Just a couple of things:
The use of — is a sign, but when I started out it was all the rage, and I got used to it. I only recently switched back to ';'
Also, with 1 small prompt, you can set a rule for AI never to use — but solely rely on ',' and ';' so you can't judge a story purely on that.
Meaningless, pretentious 1 and 2-word sentences are the clearest sign at the moment.
Doing my best to copy AI garbage style, so don't laugh at me.:
----
The room was not only large and spacious, but it was also cold...
freezing.
cooling.
soul-suckingly sterile.
"This piercing cold is... final. It's the end." AIbion muttered under his breath, the cold air leaving his mouth, the faint trace of heat leaving his body quickly.
Quietly.
Forever.
----
So you see, the latter short sentences are all worthless.
No human writes that way. AI very often does it for 'dramatic effect'.
AI also does not simply say: "asks, says," but there are a few key words like. "Mutters under his breath."
You also need to think of the setting. If it's a WEBNOVEL, about high school students, but narrated like a Lord of the Rings Fantasy book, you also got your answer. It's quite obvious when you pay attention, especially when your target audience would never appreciate that kind of style.
I think
@Ararara did an excellent post here:
https://forum.scribblehub.com/threa...n-my-story-not-sugar-coated.27966/post-640514
The guy asking for feedback has since deleted his 0 Reader story and revised it, so it's a little more human now. Sadly, I can't use that one as an example, but it would have been perfect.
You can spot most AI stories if they create a post in the feedback section, but only write one or two small sentences or outright admit that their grammar sucks. For example, like this:
View attachment 48624
If the story ends up not only free of mistakes, but with difficult words, you already know the truth.