Okay, and just to really muddy the waters, the beta I mentioned sent me this when I requested it. It's from MST (although I'm embarrassed to say I don't know what that is).
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Short Clauses and Commas?
Is I swore, and he turned to glare at me, or I swore and he turned to glare at me correct?
Okay this is perhaps one of the most misunderstood rules. Take a good look at the sentence structure.
It contains two independent clauses. I swore. and He turned to glare at me. Technically following the rules, you would think the comma is absolutely necessary.
However, according to The Chicago Manual of Style (chapter 6 section 18), this comma can be omitted. The exact wording from Chicago is "If the clauses are very short and closely connected, the comma may be omitted."
(A short clause is generally interpreted to be 4 words or less.)
This means that I swore and he turned to glare at me is absolutely 100% correct.
Really? Is that really true?
I know this is new for several people, so I've attached several links to support this claim.
CWS Illinois (see the section "commas used to separate" number 10). You can also look at the section "commas used to set off" number 2 for examples when using adverbial phrases.
Grammarly Answers- This one shows that Gardner argues against this rule. However, both MLA, AP Styleguide, and Chicago argue for the omission of this comma.
Ted Montgomery- see 11a.
National Geographic Style Manual- (see number 5 and 6)
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So I guess it depends if you're going with Strunk & White and Gardner or the other standards.
Personally, I'm hoping this is a gray zone, and I can get by with the Elements of Style format. Going back through my manuscript and counting words in phrases to decide if the comma is valid is a step I just don't need.