None involves using commas to set off explanatory material.
In the case of a comma splice, put a semicolon after the word. Not many students think of a bookstore as the ideal spot for a final examination , but for hundreds of them it was just the right spot Wednesday 2. If it rains he will certainly get wet. Barnard once preferred to dine in fine restaurants , but now she has to eat at home. He said that in practice , however , no one ever follows through on a pledge.