OK, last but not least today, here is a learning support on using a comma to set off a nonrestrictive or parenthetical word, phrase, or clause. This is the fifth of fifteen forthcoming posts on learning supports for using the comma in prose. (You can find an excursus on this choice of publishing practice here.)
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.
Mark's Text Terminal 