Questions & Answers about La petanto skribas sian familinomon.
Why is it sian and not ĝian, lian, or ŝian?
Sia is the reflexive possessive adjective in Esperanto. It means his/her/its/their own and refers back to the subject of the clause.
In La petanto skribas sian familinomon, the subject is la petanto (the applicant), so sian familinomon means the applicant’s own family name.
Compare:
- La petanto skribas sian familinomon. = The applicant writes their own family name.
- La petanto skribas lian familinomon. = The applicant writes his family name, meaning someone else’s.
So sian is used because the owner and the subject are the same person.
Why does sian end in -n?
Because sian agrees with the noun it describes, and the whole object is in the accusative.
Here, familinomon is the direct object of skribas, so it takes -n:
- familinomo = family name
- familinomon = family name (as a direct object)
Any adjective or determiner that goes with that noun also matches it, so:
- sia familinomo
- sian familinomon
This is a very common Esperanto pattern: modifiers agree with the noun in both number and accusative marking.
Why does familinomon have -n?