YOU SAID:

I bet nobody can translate this

INTO JAPANESE

誰もこれを翻訳できないに違いない

BACK INTO ENGLISH

No one must be able to translate this

INTO JAPANESE

誰もこれを翻訳できてはいけません

BACK INTO ENGLISH

No one should be able to translate this

INTO JAPANESE

誰もこれを翻訳できないはずです

BACK INTO ENGLISH

No one should be able to translate this