As a native speaker, the basic usage of "neither" and "nor" are perfectly clear to me. However, natives may suffer from colloquial usage sounding more normal than formal grammar. I definitely have that with this one. I am not entirely sure whether the following sentences are technically correct, which is due to the lack of "neither", normally used to negate, in these sentences:
- A nor B is not true.
- (There is a negation in there, but this sounds strange to me.)
- A nor B is true.
- (Sound better, as though the "neither" is merely skipped, but I imagine this might be the one that is technically wrong.)
- A nor B nor C is true.
- A nor B nor C is not true.
It would be nice to hear from someone who is really sure about these things, as opposed to me only judging by the sound of it.