This document discusses the use of "so" and "neither" when agreeing or disagreeing with statements made by others. It explains that "so" is used when statements are affirmative, such as "John is a student, so am I." "Neither" is used when statements are negative, like "John isn't a doctor, neither am I." Several examples are provided to illustrate the proper usage of these words. A short quiz at the end tests the reader's understanding of when to use "so" and "neither" in different sentence constructions.