The short quiz asks questions that test your ability to correctly use apostrophes and commas. MRP scored 92 percent on the quiz because I sided with the Word on this question:
The next six, on commas, are more complicated. “Stop, or I’ll scream”? The quiz demands the comma, but does it really belong in that short, urgent command? When I check the book, I see the problem: Truss thinks “Stop” is an interjection, like “blimey” or “golly” or “heh-heh.” But it’s not — it’s a verb. And in a short compound sentence like “Stop or I’ll scream,” that comma is absolutely optional.
How did you do?