3.2: Comma After Introductory Element

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It’s important to remember that introductory words and phrases—any words or phrases that come before the main clause in a sentence—should be set off with a comma. Here is an example of a sentence that does not include the required comma and then the correction:

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For more information on this comma rule, be sure to check out the Comma section in the Punctuation area of Grammar Essentials.