YOU SAID:

I can't believe you've done this.

INTO JAPANESE

私はこれをやったなんて信じられない。

BACK INTO ENGLISH

Can't believe I did it.

INTO JAPANESE

それをしたなんて信じられない。

BACK INTO ENGLISH

Can't believe it.

INTO JAPANESE

それを信じることができません。

BACK INTO ENGLISH

I can not believe it.

INTO JAPANESE

信じられない。

BACK INTO ENGLISH

17583:wait

INTO JAPANESE

信じられない

BACK INTO ENGLISH

17583:wait