Use a comma to separate an introductory word, phrase, or clause from the rest of the sentence.

Ex: Yes, I will go. After circling twice, the airplane

landed.

Note: The comma may be omitted if there would be little pause in speaking.

Ex: At first I didn’t know what to do.

Use commas to set off words or groups of words that interrupt the flow of thought in a sentence.

Ex: Anne, to tell the truth, was quite happy.

The report, moreover, is altogether inaccurate.

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