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My mother's office, which is being renovated, is located on Main Street.
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My mother's office is on Main Street, and it's currently being renovated.
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The office being renovated is my mother's.
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Although it is being renovated, my mother's office remains on Main Street.
1 answer
The sentence that contains a nonrestrictive phrase is:
My mother's office, which is being renovated, is located on Main Street.
In this sentence, the phrase "which is being renovated" provides additional information about the office but is not essential to the sentence's main point. Hence, it is a nonrestrictive phrase.
