The document discusses syntactic categories like nouns, verbs, noun phrases, and verb phrases. It explains that "instructors" and "Brian" have the same syntactic distribution as nouns. It also analyzes the sentence "The new instructors taught on the second floor yesterday" by identifying its noun phrase, verb phrase, adjectives, prepositional phrases, and adverbial adjunct. Diagrams are provided to label the syntactic structure of the example sentence.