An adjective clause, also called a relative clause, modifies a noun and follows or precedes the noun in English and Turkish respectively. Relative pronouns like who, which, that are used to join two sentences about the same person or thing into one sentence. Who is used to refer to people and that can also be used instead of who. Which is used to refer to objects, animals or things and that can also be used instead of which. Relative clauses are used to concisely and clearly identify a noun by providing additional descriptive information about it.