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Spoken language contains many signals to make the meaning of a sentence clear.
Written words can never truly replace a verbal conversation, but as more and more people use the Net to communicate with others, learning the conventions become very important. Periods, commas and question marks evolved separately and over time. The ancient Greeks used a dot between words to indicate a pause. It was used as either a comma or a period. It wasn't until the 1600's that printers got into the habit of using a period to mark the end of a statement.