문장마다 that이 어떻게 쓰였는지 궁금해요

You are the only person that matters: it is your sense of pleasure that you are trying to please.
You should listen to those cells in the brain that tell you what you really want.
A purely rational view would have predicted that interest rates would be the only factor that had an impact.
여기서 that이 각각 어떤 용법인지 알려주세요.
주격인지 목적격인지도 궁금합니다.