YOU SAID:

i can not believe you would do that to my friend

INTO JAPANESE

私はあなたが私の友人にそれをするだろうと信じることはできません

BACK INTO ENGLISH

I can not believe you will do it to my friends

INTO JAPANESE

私はあなたが私の友人にそれをするとは信じられない

BACK INTO ENGLISH

I can not believe that you will do it to my friends

INTO JAPANESE

私はあなたが私の友人にそれをするとは信じられない

BACK INTO ENGLISH

I can not believe that you will do it to my friends