...punctuation (punc - tu - a - tion)

1. A period is used at the end of a sentence and after an abbreviation.
Japanese	English
	I have a cold.
	We do not want to purchase the house.
	U.B.C. - University of British Columbia.
	N.A.T.O. - North Atlantic Treaty Organization

2. The question mark is used in setences asking a question.
Japanese	English	Contraction
	Can you not go?	Can't you go?
	How could she not go?	How couldn't she go?
	Will John not answer my question?	John won't answer my question?