Hopefully this is somewhat useful... "I neither swam nor ran today." Neither... Nor... "Neither of us know Chinese" Neither by itself. Nor is never by itself as far as I know.

You should also realise that colloquially, people might say "neither...or..." instead of "neither...nor...". It's not correct, but you should recognise it when you hear it.

Of course, I understand ... I'm studying and practicing slowly, some details I will learn at the same time. Thanks for attention!

More commomly also after a first negative sentence to add a second negative "I don't like getting up at 5 in the morning, nor do i like eating breakfast this early" Can also say "i dont like eating breakfast this early either" but is less elegant/more clumsy

Perfect, now I understand... Thanks, Emily! xD