A clause is a group of words containing a subject and a verb. There are two types of clauses: independent clauses and dependent clauses. An independent clause can stand alone as a sentence, while a dependent clause cannot because it is not a complete thought and needs to be attached to an independent clause. Dependent clauses include adverb clauses, noun clauses, relative clauses, and participle clauses. Adverb clauses specify time, place, manner or cause. Noun clauses function as subjects or objects. Relative clauses give more information about a noun and start with relative pronouns like who, which, whose, whom, that.