Question

restrictive and non-restrictive relative clauses? with example.
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Answer 1

When a relative clause merely gives some additional information about the noun, it is called a non-defining or non-restrictive relative clause. Note that a non-restrictive relative clause is not necessary for the identification of the noun. My brother, who is a doctor, lives abroad.

Answer 2

Answer:

A restrictive clause is a clause that identifies the word it modifies.

Explanation:          A restrictive clause is a clause that identifies the word it modifies. Roller derby is a sport that I like to watch . ( That I like to watch is an adjective restrictive clause. It contains the subject I and the verb like. The clause modifies the noun sport, providing necessary information about it.)

A nonrestrictive modifying clause (or nonessential clause) is an adjective clause that adds extra or nonessential information to a sentence. The meaning of the sentence would not change if the clause were to be omitted. Nonrestrictive modifying clauses are usually set off by commas.  

Peter Jones , who plays goalkeeper for our village football team, has worked at his father's greengrocers for twenty years.