YOU SAID:
My dad left me when I was 2.
INTO JAPANESE
2歳のときに父が私を離れました。
BACK INTO ENGLISH
My father left me when I was two.
INTO JAPANESE
私が2歳のとき、父は私を離れました。
BACK INTO ENGLISH
When I was two, my father left me.
INTO JAPANESE
私が2歳のとき、父は私を置き去りにしました。
BACK INTO ENGLISH
When I was two, my father left me behind.
INTO JAPANESE
私が2歳のとき、父は私を置き去りにしました。
BACK INTO ENGLISH
When I was two, my father left me behind.
That didn't even make that much sense in English.