Does a comma preceed "therefore?"
Not always. If it starts sentence, a comma may follow it but not precede it. It depends on how it's used in other cases.
As an adverb it usually does not have commas around it if it is essential to the meaning of the sentence.
The cell phone is thin and light and therefore very convenient to carry around.
If it begins a sentence or an independent clause, it have a comma after it almost every time.
Therefore, we never saw what happened.
|link comment||answered Aug 15 '13 at 17:48 Lewis Neidhardt Grammarly Fellow|
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