novella
Active Member
A more trustworthy rule of thumb--moreso than the natural pause, say--is: if the phrase can stand on its own as a clear sentence, then it should not have a comma: don't separate the subject from the predicate. (This summarizes many of the actual grammatical rules.) Also, there's a lot of leeway in deciding whether to use certain kinds of commas. There are comma-heavy writers and comma-light ones. The Brits are naturally comma-light I find. So if you're not sure, chances are there is more than one correct way to do it.