This document defines and provides examples of various grammatical elements including letters, words, phrases, clauses, and sentences. It discusses the basic units of grammar such as letters, words, and their classes. It then explains the types of phrases including noun, verb, adjective, and prepositional phrases. Next it covers the different types of clauses like independent clauses, dependent clauses, and relative clauses. Finally, it summarizes the different types of sentences like simple, compound, complex, and compound-complex sentences.