YOU SAID:
You doofus ,how could you!?
INTO JAPANESE
あなたはdoofus、どうしました!
BACK INTO ENGLISH
You are doofus, what's wrong!
INTO JAPANESE
あなたはdoofusです、何が悪いのですか!
BACK INTO ENGLISH
You are a doofus, what is wrong?
INTO JAPANESE
あなたはdoofusです、何が悪いのですか?
BACK INTO ENGLISH
You are a doofus, what is wrong?
That didn't even make that much sense in English.