YOU SAID:

Oh! I can't believe you've done this!

INTO JAPANESE

ああ！あなたがこれをやったとは信じられません！

BACK INTO ENGLISH

Oh! I can't believe you did this!

INTO JAPANESE

なんて事をしたんだ

BACK INTO ENGLISH

I can't believe you did this.

INTO JAPANESE

なんて事をしたんだ

BACK INTO ENGLISH

I can't believe you did this.