Adjective and Adverb Clauses Worksheets and Test. Three practice worksheets on adjective clauses and a grammar test with 20 questions on identifying adverb and adjective clauses in sentences, which is key to understanding sentence structure. (I am in the process of adding the adverb clauses worksheets, which are to be added soon.) There are four parts to each question on the test: underline the clause, identify it as adjective or adverb, identify the relative pronoun or subordinating conjunction