The dash and hyphen aren't the same, but many writers use them as if they were. Do you use a dash--if you use one--as the grammar books dictate? Or do you use a hyphen - like this one - to punctuate your sentence? Do you put your dash next to the word--like this, or do you leave a space after the last letter and before the first of the two hyphens -- like this? Which is correct?
