This section of an online grammar guide from the University of Calgary provides definitions and examples of adjective clauses and adverb clauses.

The first half of this tutorial on clauses and phrases covers topics such as independent clauses, dependent clauses, adjective clauses, adverb clauses, noun clauses, essential clauses, and nonessential clauses. The second part discusses...

Defines clause and provides examples of the different types. Includes an exercise to test your understanding.