Answer:
The letter S is added to pluralise most words in the English language. eg. Letter to Letters Word to Words and Language to Languages. But I am a word that is pluralised with the addition of the letter C.
I mean goodbye for South Americans.
I jump when I walk and sit when I stand. What am I?
I think you live beneath a roof that is upheld by me; I think you seldom walk abroad but my fair form you see; I close you in on every side you very dwelling pave and probably I'll go with you At last into the grave.
I am heavy forward, but backward I'm not. What am I?
What never gets any wetter no matter how hard it rains?