YOU SAID:
I left my bag here. When I came back, it was gone.
INTO JAPANESE
私はここにバッグを置いた。私が戻ってきたとき、それは消えていました。
BACK INTO ENGLISH
I put a bag here. When I came back it was gone.
INTO JAPANESE
ここにバッグを入れました。私が戻ってきたとき、それは消えていました。
BACK INTO ENGLISH
I put a bag here. When I came back it was gone.
That didn't even make that much sense in English.