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10.A. Use a comma when two sentences are joined with and, or, but, or nor.

10.B. Use commas to separate three or more elements in a series.

10.C. Place a comma between two consecutive adjectives that describe the same noun.

10.D. Separate unrelated numbers with a comma if it clarifies the numbers. Put commas in numbers with four or more digits.

10.E. Use commas to separate parts of dates and addresses.

10.F. Place commas after most introductory words or phrases.

10.G. Use commas to set off elements providing additional information that could be omitted without changing the meaning of the sentence.

10.H. Use commas to separate transitional expressions whenever the flow of the sentence is interrupted.

10.I. Use commas to set off a word or phrase that renames the noun or pronoun that came before it. These are called appositives.

10.J. Use a comma to set off contrasting elements that are not essential to the meaning of a sentence.

10.K. Insert commas to help avoid confusion in the reading of the sentence.

10.L. Lesson Test.