YOU SAID:
You've done terrible things, haven't you ?
INTO JAPANESE
あなたは恐ろしいことをしたのですか?
BACK INTO ENGLISH
Did you do horrible things?
INTO JAPANESE
あなたは恐ろしいことをしましたか?
BACK INTO ENGLISH
Have you done horrible things?
INTO JAPANESE
あなたは恐ろしいことをしましたか?
BACK INTO ENGLISH
Have you done horrible things?
That didn't even make that much sense in English.