Basically both nee nett and selayva nett mean never.
Nee Nett → Selayva Nett
Both phrases mean never, and using either one interchangeably should be understandable to a native speaker. So don’t get too worried about which to use.
As with many similar words that mean the same thing, it’s often a matter of picking which sounds and flows better in the sentence.
Nee Nett = Never
Examples
- Di batteries zayla nee nett shtauva koss si sinn rechargeable.
- Favass sedda miah nee nett unsah family lossa unsah meind tshaynsha?
Selayva Nett = Never
Examples
- Du kansht shuah sei es Gott zayld dich selayva nett frohwa fa may du es du du kansht.
- Eiyah baybi is selayva nett zu yung fa en anri language lanna.