YOU SAID:
Your keys are in the back of my pocket.
INTO JAPANESE
あなたの鍵は私のポケットの裏にあります。
BACK INTO ENGLISH
Your key is behind my pocket.
INTO JAPANESE
あなたの鍵は私のポケットの後ろにあります。
BACK INTO ENGLISH
Your key is behind my pocket.
That didn't even make that much sense in English.