Monday, June 30, 2014

Using a comma before a subordinate clause

It is very common that we don't insert a comma before a subordinate clause at end position as follows:




The President was opening a new university when a bomb went off.




However, I came across the same construction with a comma:





The President was opening a new university, when a bomb went off.




My question is, what is the function of the comma in the above construction?

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