Restrictive and Nonrestrictive Clauses Exercise 2

nonrestrictive clause is a subordinate clause that may be left out of a sentence without significantly altering the meaning expressed by the main clause. In a restrictive clause, on the other hand, the information is related to a word in the main clause. Nonrestrictive clauses are set off by commas; restrictive clauses are not.

Add commas where needed in the following sentences.