This paper presents a two-session teaching unit on German change-of-state tokens such as "oh," "ach" and "achso." Goal is to teach students the appropriate reaction through change-of-state tokens in various situations. Students are provided with authentic data based on empirical research in conversation analysis (CA). By the end students will be familiar with the German change-of-state tokens and be aware of the difficulties of translating "oh," who often is a false friend. They will be able to differentiate between a cognitive and an emotional change-of-state token and know where the English "oh" cannot be translated with an German "oh." The unit focuses on "ach," "achso" and "oh" in the German language and helps students to sound more fluent in their second language since the tokens glue speech together. For this reason, it is important for students to learn how to use change-of-state tokens.