This document provides a lesson on using the words "don't" and "do not" in English. It explains that "don't" and "do not" are used to say what should not be done. Examples are given showing "do not" and "don't" used in sentences telling someone not to concern themselves with other's problems, behave badly, announce leaving until having a job, argue, or arrive late to an important meeting. Related lessons on the verb "want" and using dictionaries are also listed.