YOU SAID:

oh i can't believe you've done this

INTO JAPANESE

ああ私はこれをやった信じることができません。

BACK INTO ENGLISH

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

INTO JAPANESE

ああ私はこれをやったなんて信じられない。

BACK INTO ENGLISH

Oh I've done which I can't believe.

INTO JAPANESE

ああ私は私は信じていることはできませんをやった。

BACK INTO ENGLISH

Oh I can't believe I did it.

INTO JAPANESE

あー 信じられない

BACK INTO ENGLISH

Oh, I can't believe it.

INTO JAPANESE

あー 信じられない

BACK INTO ENGLISH

Oh, I can't believe it.