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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