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Commas: Learning Resources
Especially helpful sections for using commas will be “Word and Sentence Level” and “Ask Grammar, Quizzes, Search Devices.” Under “170+ Active Quizzes,” scroll down until you find a section called “Punctuation & Basic Mechanics.” The first four interactive tests are on the use of commas. Do tests 1 through 3 to check your own knowledge of the rules. Then do the fourth test, in which you are asked to punctuate a paragraph, using commas as needed. Check your work against the answers given by the program. If you have questions that were unanswered by the testing process, you may want to print your answers to discuss them with your instructor.
Great curriculum at this award-winning online writing lab, and useful exercises to help you develop your skills.