YOU SAID:
Who you think you are dealing with?
INTO JAPANESE
あなたは誰と取引していると思いますか?
BACK INTO ENGLISH
Who do you think you are dealing with?
INTO JAPANESE
あなたは誰と取引していると思いますか?
BACK INTO ENGLISH
Who do you think you are dealing with?
That didn't even make that much sense in English.