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 simple difference, such as "I'm not a pizza lover - I'm not either" versus "I can play soccer for hours - I can too". The document then provides an in-class activity where students must respond to statements using either "too" or "either". It concludes with instructions for pair work where students take turns making statements and responding.