YOU SAID:
When you die, your body dies.
INTO JAPANESE
あなたが死ぬと、あなたの体は死にます。
BACK INTO ENGLISH
When you die, your body will die.
INTO JAPANESE
あなたが死ぬとき、あなたの体は死ぬでしょう。
BACK INTO ENGLISH
When you die, your body will die.
That didn't even make that much sense in English.