A non restrictive clause is

A non-restrictive clause, also known as a non-defining clause, is a group of words containing a subject and a verb that provides additional information to a sentence. It is not necessary for the overall meaning or grammar of the sentence. Non-restrictive clauses are typically set off by commas, dashes, or parentheses.

To identify a non-restrictive clause in a sentence, you can follow these steps:

1. Identify the main sentence: Look for the independent clause, which is a group of words that can stand alone as a complete sentence.
2. Look for additional information: If you find a group of words within the sentence that provides extra details about a noun or pronoun in the main sentence, it is likely a non-restrictive clause.
3. Check for punctuation: Non-restrictive clauses are typically set off by commas, dashes, or parentheses. These punctuation marks indicate that the clause is not essential to the core meaning of the sentence.

Here's an example of a sentence with a non-restrictive clause:

"The Eiffel Tower, which is located in Paris, is a famous landmark."

The main sentence is "The Eiffel Tower is a famous landmark." The non-restrictive clause "which is located in Paris" provides additional information about the Eiffel Tower but is not necessary for the main sentence to make sense. It is set off by commas to show that it is non-restrictive.

Remember, non-restrictive clauses add extra information but can be removed without changing the primary meaning of the sentence.