Defining and Nondefining Relative Clauses

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My favorite building in Chicago is the Sears Tower, which used to be the tallest building in the world.

which used to be the tallest building in the world--the Sears Tower--non-defining

Chicago attracts people who aren't afraid of the cold winters.

who aren't afraid of the cold winters--people--defining

My friend Becky, who lives in Chicago, is a doctor.

who lives in Chicago--Becky--non-defining

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