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Category 2: Non-Defining (Non-Restrictive) Adjective Clauses
Explanation: Non-defining or non-restrictive adjective clauses provide additional, non-essential information about a noun. If you remove the clause, the sentence’s core meaning remains intact.
Examples:
- Example 1 (with Non-Defining Adjective Clause):
- My friend Sarah, who loves to travel, just returned from a trip.
- Without the clause: “My friend Sarah just returned from a trip.”
- Explanation: Removing the clause does not change the main idea of the sentence; it merely provides extra information about Sarah’s interests.
- Example 2 (with Non-Defining Adjective Clause):
- The Eiffel Tower, which is in Paris, is a famous landmark.
- Without the clause: “The Eiffel Tower is a famous landmark.”
- Explanation: The clause offers additional information about the location of the Eiffel Tower but is not necessary to understand that it’s a famous landmark.
- Example 3 (with Non-Defining Adjective Clause):
- My cat, whose name is Whiskers, is very playful.
- Without the clause: “My cat is very playful.”
- Explanation: The clause provides the cat’s name, but removing it does not alter the main message that the cat is playful.
- Example 4 (with Non-Defining Adjective Clause):
- The book, which I read last summer, was a bestseller.
- Without the clause: “The book was a bestseller.”
- Explanation: While the clause mentions when the book was read, it’s not necessary to convey that it was a bestseller.
- Example 5 (with Non-Defining Adjective Clause):
- The concert, where we had a great time, lasted for three hours.
- Without the clause: “The concert lasted for three hours.”
- Explanation: The clause mentions our enjoyment of the concert but is not essential to the concert’s duration.
Exercise: Identify the non-defining adjective clause in each sentence:
- My friend Tom, who is from New York, is coming over.
- The Eiffel Tower, which is in Paris, is a famous landmark.
- My dog Fido, who is very playful, loves to chase balls.

