Reasons for Commas

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Reason 1: Items in a series

        The flag is red, white, and blue.

        We watched the heavy, pounding rain during the storm.

 

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Reason 2: Between independent clauses with a conjunction

        Conjunctions: and but for nor or so yet

        The mayor gave a speech, and reporters asked questions.

        The telephone rang several times, but no one answered it.

 

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Reason 3: After introductory expressions

        Jerry, please close the door.

        After the first snowflakes, we all got excited.

        Because the road were slick, Mary drove carefully.

 

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Reason 4: Before and after interrupting expressions

        Mow the lawn, Dennis, before it rains.

        Cecelia put the plant, a cactus, on the table.

        This is Greg Nelson, my cousin from Atlanta.

 

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Reason 5: With dates, addresses, & the closing of a letter

        Laura was born on May 29, 1980, in Canton, Ohio.

        Very sincerely yours,

 

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Reason 6: With quotations

        Maria said, "This is my jacket."