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Punctuating Qualifiers

Next is the issue of how to punctuate modifiers. Ultimately, once you have determined whether a modifier is restrictive or non-restrictive, it becomes a simple matter to punctuate. A restrictive modifier does not require its own punctuation. Non-restrictive modifiers, meanwhile, should be set off by commas (one if at the end of the sentence, two if in the middle). Example: My sister, Martha, is a nurse.

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