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Ultimate Style. The Rules of Writing. Real Writers Need Rules.
Punctuation

 
Parentheses
Parentheses are used to separate off asides or nonessential information. Material set off by commas and dashes should be pertinent to the rest of the sentence; material enclosed by parentheses can be a little more discursive.
• That man (the one in the baseball cap) just asked for my number.

Parentheses set off information more firmly than commas or dashes do. They tell the reader, “It’s okay to skip this if you like.” Dashes insist, “Pause here and read this!” Commas say, meekly, “A pause would be nice.”

Parentheses are used to cite sources.
• In the next paragraph, he writes, “Some people show evil as a great race horse shows breeding” (Hemingway, 109).
Parentheses can be used to provide translations or short explanations next to rare terms.
• Carl called me a jabroni (loser).
Do not italicize parentheses that enclose an italicized word.
• The formal you (vous) has confused students for years.
Phone Numbers
Parentheses can be used around area codes.
• If you want the best wallpaper in town, call (212) 633-2222.
With Periods
If parenthetical matter is included in a sentence, closing punctuation should go outside the parentheses. This holds true even if the parentheses enclose a complete sentence.
• Sheldron refused to invite him (they’ve been enemies since first grade).
Parenthetical expressions that stand alone and are complete sentences get their own punctuation.
• Seymour has never been to Italy. (In fact, he’s never left the country.)
With Commas, Semicolons, Colons
You should never place commas, semicolons, or colons before closing parentheses; always put them outside closing parentheses.
• Whatever you do (and really, I don’t care), don’t get me involved.
• She bid adieu to Sandy (her parrot); then, with a sigh, she turned away.
• She listed several options (all of them tempting): mint, chocolate, and raspberry.
With Question Marks or Exclamation Points
Don’t place question marks or exclamation points before closing parentheses unless they are part of the parenthetical material.
• Who better to herd sheep than Nate (the one in the cloak)?
The question mark is part of the sentence, not part of the parenthetical.
• Neha was wondering (weren’t we all?) when the pigs would arrive.
The question mark is part of the parenthetical, not part of the sentence.
• The package didn’t arrive, but don’t tell Sheila (or anyone else)!
The exclamation point is part of the sentence, not part of the parenthetical.
• The package arrived (finally!) after five weeks.
The exclamation point is part of the parenthetical, not part of the sentence.
Parentheses Within Parentheses
For parentheses within parentheses, use either brackets or parentheses; whichever you choose, be consistent.
• Mrs. Whelan refused to let her daughter date Reg (she hated his sneering [shockingly rude, really] attitude).
• Mrs. Whelan forbid her daughter to date Reg (she hated his sneering (shockingly rude, really) attitude).

 
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Punctuation