Pairs of Commas

Commas are sometimes used to set off an interrupting thought in the middle of a sentence, much the same way that parentheses or dashes are used. The trouble is, sometimes the writer forgets to put the second comma in, leaving editors like me hanging, waiting for the other shoe to fall.

Bad Example:
Well 73, currently producing 65 bbl/day of oil is the next one on the list for a workover.

There should be a second comma after “oil” to frame the extraneous information on both sides from the rest of the sentence, which can stand alone without it.

You can move the extraneous information to the beginning or the end of the sentence, in which case only one comma is needed.

Good Examples:
Currently producing 65 bbl/day of oil, Well 73 is the next one on the list for a workover.
Well 73, currently producing 65 bbl/day of oil, is the next one on the list for a workover.
Well 73 is the next one on the list for a workover, currently producing 65 bbl/day of oil.

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