YOU SAID:

so what do you want to do

INTO JAPANESE

それで何をしたいのですか

BACK INTO ENGLISH

what do you want to do with that

INTO JAPANESE

それをどうしたいのですか

BACK INTO ENGLISH

what do you want to do with it

INTO JAPANESE

それを使って何をしたいですか

BACK INTO ENGLISH

what do you want to do with it