Identify the correctly punctuated sentence.
Correct answer: B. My brother, who lives in Karachi, is a doctor.
- A. My brother who lives in Karachi is a doctor.
- B. My brother, who lives in Karachi, is a doctor.
- C. My brother who lives in Karachi, is a doctor.
- D. My brother, who lives in Karachi is a doctor.
Explanation
A non defining relative clause, one that adds extra information rather than identifying which brother, is enclosed by a pair of commas. Using only one comma is always wrong, since the pair works like brackets. Without commas the clause would be defining, implying the speaker has more than one brother.
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About Punctuation
Punctuation marks show structure, pauses, relationships and emphasis in written sentences. Questions cover commas in lists, clauses and nonessential phrases, semicolons between independent clauses, colons, apostrophes, quotation marks and hyphens, as well as the errors that create fragments, run-on sentences or comma splices.
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