YOU SAID:
really i don't believe you
INTO JAPANESE
本当にあなたを信じていません。
BACK INTO ENGLISH
Do not believe you.
INTO JAPANESE
信じないぞ!
BACK INTO ENGLISH
I do not believe you!
INTO JAPANESE
信じないぞ!
BACK INTO ENGLISH
I do not believe you!
You've done this before, haven't you.