The document defines and provides examples of different types of clauses:
1. A clause is a group of words containing a subject and predicate that forms part of a sentence or can stand alone. Clauses can be main or subordinate.
2. Noun clauses function as nouns. Nominal clauses contain a subject and predicate and do the work of a noun.
3. Adjective clauses modify nouns and contain a subject and predicate. They are introduced by relative pronouns.
4. Adverb clauses modify verbs, adjectives or other adverbs and contain a subject and predicate. They are introduced by subordinating conjunctions and provide information about time, place, manner, reason etc