we are very sorry that you experienced problems with our product, the az-400 electronic dictionary.although we doall thatto ensure that our products are of the highest quality, sometimes a problem can arise with them.all that이 무엇을 말하는건가요? that은 딴걸 가르키는 지시대명사인가요? 문법적으로 어떻게 되는지 알려주세요.