1. Adjective Clauses

2.  Adjective clauses ( relative clauses) are types of subordinate clauses that act as adjectives.  The whole clause does the job of an adjective.

3. Relative pronoun introduce relative clauses  Most of the time, relative clauses are introduced by relative pronouns who, whom,whose, that, which  Here are examples using these relative pronouns:  1. The person who made the mess needs to clean it ( modifying the person)  2. The person whom you teach is my sister. ( modifying girl)

4. Relative pronoun introduce relative clauses  3. people whose cats shed need to vacuum often. ( modifying people)  4. This is the house that Ali built. ( modifying house)  5. The book which I had not read fell on the floor. (modifying book)

5. No relative pronoun  Sometimes the relative pronoun is missing from the relative clause.  We can still have an adjective clause without the relative pronoun.  The instrument that I love is the piano.  Or: The instrument I love is the piano.

6. Relative Adverbs  While most of the time relative clauses are introduced by relative pronouns, sometimes they are introduced by relative adverbs ( where, when, why)  This is the park where we played.  Tuesday is the day when we have pizza for dinner.  Our teacher told us the reason why we study grammar.