Set off a nonessential clause
The idea
When a clause adds information without identifying which person or thing you mean, set it off on both sides.
Step by step
- Use the context to decide whether the noun is already uniquely identified.
- Locate the complete extra clause from its opening relative pronoun to its end.
- Use a comma before and after that clause if the main sentence continues.
Example
Original sentence: Jo who repairs bikes fixed the wheel. Jo is already uniquely identified; the repair information is extra.
The context identifies Jo uniquely. Which sentence correctly sets off the extra clause?
Answer
Jo, who repairs bikes, fixed the wheel.
Who repairs bikes adds information about the already identified Jo; commas surround the complete clause.
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5 questionsTry it together
Describe a uniquely named building with an extra which clause. Remove the clause to check the main sentence.
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