YOU SAID:

never have i ever had done what i havent done

INTO JAPANESE

決して、これまで何を行っていないやった

BACK INTO ENGLISH

Never ever not done what you've done

INTO JAPANESE

決して行われていない何をやった

BACK INTO ENGLISH

Never done what I've done

INTO JAPANESE

やったやった

BACK INTO ENGLISH

Did

INTO JAPANESE

何にやったの?

BACK INTO ENGLISH

Did