Topics: Grammar - English

A nonrestrictive clause is a relative clause that introduces additional information that may be omitted. Restrictive clauses simply elaborates on a noun and the information it introduces is not necessary. Restrictive clauses are delimited by commas, unlike restrictive clauses.

For instance, in the following sentences:

  • I wanted to thank personally your mother, who helped me this last week.
  • The book, which quickly became popular, has sold more than a million copies.
  • He just met his brother, John Smith, after 20 years of hard search.

…the bold parts indicate the nonrestrictive clause.