This document discusses the differences between the words "either" and "too". It states that "either" is used in negative sentences while "too" is used in positive or affirmative sentences. Several examples are provided to illustrate this distinction, such as "I'm not a pizza lover - I'm not either" versus "I can play soccer for hours - I can too". The document concludes with an in-class activity where students must respond to statements using either "too" or "either" and then pair work where students take turns making statements and responding.