I forgot to mention this, but Aetherians have a distinct accent.

Like you can just hear one speak and immediately know that they are Aetherian

Unless they are a different species that was lucky enough to learn Aetherian (S1 Creators and Council, Ash)

Doesn't matter what other languages you know or what your first language is, the Aetherian accent will be there if you know how Aetherian works

It's strange, but that's just how it works

Also it's generally taboo to teach a foreign species Aetherian, unless you are the Elder or the Elder has given you permission (haha Notch broke the taboo with Steve and Herobrine)