YOU SAID:

I have to make a decision about my favorite song of hers

INTO JAPANESE

私は彼女のお気に入りの曲について決断しなければならない

BACK INTO ENGLISH

I have to decide on her favorite song

INTO JAPANESE

彼女のお気に入りの曲を決めなければならない

BACK INTO ENGLISH

I have to decide on her favorite song.

INTO JAPANESE

彼女のお気に入りの歌を決めなければならない。

BACK INTO ENGLISH

I have to decide on her favorite song.