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Possible Duplicate:
When do I use the comma?

Before I go I will return the book.

Do we have to use a comma in the above sentence?

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marked as duplicate by Robusto, tchrist, Jasper Loy, Matt E. Эллен, MετάEd Jan 5 '13 at 19:32

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 4 down vote accepted

I would, because the first three words constitute a ‘weak interruption’ to the sentence. This is perhaps clearer with a slight re-ordering of the words to read ‘I will, before I go, return the book.’ The point about a weak interruption is that it can be removed without destroying the sentence. ‘I will return the book’ doesn’t give as much information as the fuller version, but it remains a grammatical sentence.

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