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Commas!

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PRESENTATION OUTLINE

Commas!

because, like me, you probably need a refresher 

While a period ends a sentence, a comma indicates a smaller break. Some writers think of a comma as a soft pause—a punctuation mark that separates words, clauses, or ideas within a sentence.

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Use a comma to separate the elements in a series (three or more things)

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"He hit the ball, dropped the bat, and ran to first base."

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Use a comma + a little conjunction (and, but, for, nor, yet, or, so) to connect two independent clauses

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"He hit the ball well, but he ran toward third base."

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Use a comma to set off introductory elements

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"Running toward third base, he suddenly realized how stupid he looked."

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Use a comma to set off parenthetical elements (a part of a sentence that can be removed without changing the essential meaning of that sentence)

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The Founders Bridge, which spans the Connecticut River, is falling down.

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Appositives are almost always treated as parenthetical elements.

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Eleanor, his wife of thirty years, suddenly decided to open her own business.

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When a parenthetical element — an interjection, adverbial modifier, or even an adverbial clause — follows a coordinating conjunction used to connect two independent clauses, we do not put a comma in front of the parenthetical element.

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The Yankees didn't do so well in the early going, but frankly, everyone expects them to win the season. [no comma after "but"]

The Tigers spent much of the season at the bottom of the league, and even though they picked up several promising rookies, they expect to be there again next year. [no comma after "and"]

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When both a city's name and that city's state or country's name are mentioned together, the state or country's name is treated as a parenthetical element.



We visited Hartford, Connecticut, last summer.

Paris, France, is sometimes called "The City of Lights."

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When the state becomes a possessive form, this rule is no longer followed:



Hartford, Connecticut's investment in the insurance industry is well known.

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Also, when the state or country's name becomes part of a compound structure, the second comma is dropped:



Heublein, a Hartford, Connecticut-based company, is moving to another state.

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Use a comma to separate coordinate adjectives

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You could think of this as "That tall, distinguished, good looking fellow" rule (as opposed to "the little old lady"). If you can put an and or a but between the adjectives, a comma will probably belong there. For instance, you could say, "He is a tall and distinguished fellow." So you would write, "He is a tall, distinguished man." But you would probably not say, "She is a little and old lady."

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Use a comma to set off quoted elements.

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Peter Coveney writes, "The purpose and strength of the romantic image of the child had been above all to establish a relation between childhood and adult consciousness."

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If an attribution of a quoted element comes in the middle of the quotation, two commas will be required.
"The question is," said Alice, "whether you can make words mean so many things."

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Be careful not to use commas to set off quoted elements introduced by the word that or quoted elements that are embedded in a larger structure:
Peter Coveney writes that "[t]he purpose and strength of . . ."

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And, instead of a comma, use a colon to set off explanatory or introductory language from a quoted element that is either very formal or long

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Peter Coveney had this to say about the nineteenth-century's use of children in fiction: "The purpose and strength of . . . "

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Use commas to set off phrases that express contrast.
The puppies were cute, but very messy.

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Never use only one comma between a subject and its verb

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Typographical Reasons: Between a city and a state [Hartford, Connecticut], a date and the year [June 15, 1997], a name and a title when the title comes after the name [Bob Downey, Professor of English], in long numbers [5,456,783 and $14,682], etc.

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PROCEED WITH CAUTION