Nobody could ever replace you

Nobody could ever replace you Nobody could ever replace Nobody could ever replace you.啥意思? Nobody could ever replace you为什么用could不用can 别人对我说 Nobody could ever replace you. Nobody can replace you? You,nobody can replace. Nobody can replace you g nobody can replace you Nobody can replace you in my heart the location No one could replace you in my heart Nobody can replace you ,you are unique you means a world to