Working with a dash can be a little tricky. The dash is meant to be longer than the hyphen, but standard keyboards usually only provide the option for a hyphen. British and European publications have traditionally used hyphens with a space either side to signify a pair of bracketing or parenthetical dashes that indicate an aside comment (part sentence - interruption - continued sentence).
American publications sometimes use a double hyphen with a space before and after (part sentence -- interruption -- continued sentence), but double hyphens “typeset closed” (with no spaces) are also popular (part sentence--interruption--continued sentence). This closed style is used almost exclusively in Canadian publications. As with bracketing commas, the second dash falls away if the interruption ends the sentence.
The dash used in dialogue to indicate an abrupt interruption or stop to a character’s speech is also traditionally typeset closed and either a true em-dash or a double hyphen is required to avoid confusing the dash with a hyphen.
Then there are word processing programs that do the dash for you, whether you want one or not.
Another difficulty with the dash in dialogue is coaxing your word processing program to view the dash as part of the dialogue and serve up a closing quotation mark and not an opening mark. This is really only an issue if you’re creating printed or e-publications yourself; agents and publishers usually prefer straight quotation marks in manuscripts.
In Word, type Ctrl ‘ Ctrl Shift “ to force a closing double quotation mark or Ctrl ‘ Ctrl ‘ to force a closing single quotation mark.
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