The document discusses the parts of a sentence and the five main structures used to make simple statements: 1) subject verb, 2) subject verb object, 3) subject verb complement, 4) subject verb adverbial, and 5) subject verb object object. It explains that the subject and verb form the basic structure of a statement, and that other parts like objects, complements, and adverbials can be added to provide more information. Adverbials can also be added to all five of the main structures.