Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/humanitie...

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David and Paige introduce you to the superhero of the punctuation world: the comma! Practice this yourself on Khan Academy right now: .

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Grammar on Khan Academy: Grammar is the collection of rules and conventions that make languages go. This section is about Standard American English, but there's something here for everyone.

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