In fact, precise rules govern when to use this punctuation mark ... appositives from the rest of the sentence. Appositives act as synonyms for a juxtaposed word or phrase. In the above example ...

Appositives act as synonyms for a juxtaposed word ... Use a comma when attributing quotes. The rule for where the comma goes, however, depends on where attribution comes. If attribution comes ...

Either way, it shows the importance of commas. The rule here is that you should use a comma to set off what’s called a direct address — meaning when you call someone by name or another term ...

For evidence, the truckers pointed out that the state law says overtime rules ... a comma between ‘shipment’ and ‘or distribution’ meant the legislation applied only to the single act ...

In fact, precise rules govern when to use this punctuation mark ... appositives from the rest of the sentence. Appositives act as synonyms for a juxtaposed word or phrase. For example, "While ...