Should there be a comma before the word "or?".......... Ayden couldn't decide if he wanted the root beer float, or the banana cream pie.
No.
Add a comma OR Don't add a comma?? ......... Lucius Malfoy ate a giant burrito for lunch and now he doesn't have room for dessert.
add comma
Should there be a comma before the coordinating conjunction in this sentence: Though Mitchell prefers watching romantic films, he rented the latest spy thriller and he enjoyed it very much
yes
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