"My sister never drinks."

[ShaoxuanLi]

are πότε different from ποτέ; πότε is when (asking for a time) and ποτέ is never?

[troll1995]

Yes, exactly.

[Mark958555]

Is αδερφή just a spelling variation?

[mizinamo]

No, it also corresponds to a pronunciation variation.

αδελφή is the "classical" form which was resurrected; αδερφή is what the word turned into by centuries of sound change, at least in some dialects.

Nowadays, both forms coexist.

[Dmatafonov]

Is it the same for αδελφος και αδερφος?

[mizinamo]

Yes, exactly.

[loukaki]

fascinating :)