YOU SAID:
i cant not belive that worked
INTO JAPANESE
それがうまくいったことが信じられない
BACK INTO ENGLISH
can't believe it worked
INTO JAPANESE
効果があったのが信じられない
BACK INTO ENGLISH
i can't believe it worked
INTO JAPANESE
それが効いたなんて信じられない
BACK INTO ENGLISH
i can't believe it worked
Come on, you can do better than that.