"Sofia does not like to travel by herself."

Translation: Sofia ne ŝatas vojaĝi unuope.

[pwells19]

Why not "sole"? Why use the adjective form here and not the adverb?

[cdub4language]

Kial ne? Provu ĝin!

[donaldo_zouras]

Duolingo treats "sole" as a typo.

[malfruemulo]

Sole is now accepted here! (It had been added in some but not all accepted translations for this sentence)