Read the sentence. We’re not sure if the tickets are for the preview night, the opening night, this weekend or next week. Which best describes the punctuation error in the sentence?

The sentence lists four possible times: the preview night, the opening night, this weekend, or next week. A comma should separate the third item from the final item before “or,” so the sentence needs a comma after “weekend.” The correct choice is “There should be a comma after ‘weekend.’”

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