YOU SAID:

i lost my banana in my rear

INTO JAPANESE

私は私の後部で私のバナナを失った

BACK INTO ENGLISH

I lost my banana at my back

INTO JAPANESE

背中でバナナをなくした

BACK INTO ENGLISH

I lost my banana on my back

INTO JAPANESE

私は背中にバナナをなくした

BACK INTO ENGLISH

I lost a banana on my back

INTO JAPANESE

背中のバナナをなくしました

BACK INTO ENGLISH

I lost my back banana

INTO JAPANESE

背中のバナナをなくしました

BACK INTO ENGLISH

I lost my back banana