What is the difference between restrictive and nonrestrictive clauses?
Both restrictive clauses and nonrestrictive clauses are types of relative clauses (or adjective clauses), which act as adjectives in sentences to describe nouns or pronouns.
- Restrictive clauses give essential identifying information about the nouns they modify. They often answer the question “which one?” If they are removed from a sentence, the meaning of the sentence is changed or becomes unclear (e.g., “Apples that are picked too early are sour”).
- Nonrestrictive clauses give extra, nonessential information about the nouns they modify. They can be removed from a sentence without changing its meaning or making it unclear (e.g., “Apples, which are my favorite fruit, are high in fiber”).
Nonrestrictive clauses are set off from the rest of the sentence by commas. Restrictive clauses do not require commas.