YOU SAID:
I was a little girl playing with my sister
INTO JAPANESE
私は妹と遊んでいる小さな女の子だった
BACK INTO ENGLISH
I was a little girl playing with my sister.
INTO JAPANESE
私は妹と遊んでいる小さな女の子でした。
BACK INTO ENGLISH
I was a little girl playing with my sister.
Come on, you can do better than that.