This paper aims to discuss the importance of teaching linguistic variation in English class. As language is considered a dynamic complex system (LARSEN-FREEMAN; CAMERON, 2007), which is built by its speakers in order to achieve an efficient communication, language may suffer processes of variation and change across the time. Based on these assumptions, the purpose of the article is to show some instances of variation phenomena, which have occurred in English, along with some suggestions of activities and exercises to teach them in class.