- We can play football or watch a movie.
- We can watch football, or watch a movie.
Does there need to be a comma after football?
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With only 2 items the rule is clear: without the comma.
With 3 or more items the situation about the comma before the final “or” (or “and”) is more complicated:
(The word "almost" means here that there are still debates about this subject.)
Commas separate clauses, items in lists, parenthetical phrases, etc. Wikipedia describes it well enough.
You only have two items in your “list”, so none of these cases apply here. No comma is needed.
✔️Yes: We can watch football or watch a movie.
You need the comma, and you might want an Oxford comma.
✔️Yes: We can watch football, take a hike or watch a movie.
✔️🤩 Yes: We can watch football, take a hike, or watch a movie.