Standard English ConventionsMediumEssential 'who' clause takes no commas
Standard English Conventions practice question
The early check-in rule applies only to international flights. Passengers ____ must check in at least two hours before departure.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A. who are flying internationallyCorrect
- B. , who are flying internationally,
- C. who are flying internationally,
- D. , who are flying internationally
Answer: A. who are flying internationally
The first sentence limits the rule to international flights, so 'who are flying internationally' is essential — it identifies WHICH passengers. Essential clauses take no commas.
Why the other answers are wrong
- B. , who are flying internationally,
- Commas would make the clause an aside, implying ALL passengers are flying internationally.
- C. who are flying internationally,
- A lone comma after the clause separates the subject from its verb 'must check in'.
- D. , who are flying internationally
- A lone comma before the clause has no partner and wrongly signals the clause could be dropped.
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