As English teachers one of the main endeavours will be to teach a second language to students. In this class we will investigate what second language acquisition scenarios exist, how they differ and how second language is learned in the classroom context. We will dive into theoretical aspects of second language acquisition such as error analysis and the critical period but also usage-based language learning. Language attrition as the un-learning of a language will be covered as well as criteria for language learning such as motivation, age and cognitive ability.