Sentence Fragments and Run-on sentences

[DarkPoet]

P.S. I gave two cases where these rules can be broken. One is in spoken dialogue, because people don't have to speak grammatically.

The other is when you're a bestselling author and you don't have to listen to pedants.

I don't agree that there are other times.

Maybe (just maybe, I don't really want to encourage anyone to break grammer rules just for the fun of it) you could add first person narrative here, which is - in some aspects - very close to spoken dialogue. To describe intense or complicated emotions, one often needs to employ stylistic elements like an elipsis or a climax and ends up with one of the don'ts you listed. The important point there is not to overdo it.

[Clevernick]

Maybe (just maybe, I don't really want to encourage anyone to break grammar rules just for the fun of it) you could add first person narrative here, which is - in some aspects - very close to spoken dialogue. To describe intense or complicated emotions, one often needs to employ stylistic elements like an ellipsis or a climax and ends up with one of the don'ts you listed. The important point there is not to overdo it.

Yes, agreed on all counts. But it's a borderline area -- it's very tempting to use incorrect grammar, styled as natural speech, to establish the character's voice, and then it's very very hard for the author or the editor to go through and edit the results definitively. How can you tell where the voice ends and the bad grammar begins? I think that's why most beginning authors are advised to avoid first-person narrative.