Key Issues Where are folk languages distributed? Why is English related to other languages? Why do individual languages vary among places? Why do people preserve local languages? Learning Outcomes 5.1.1: Name the largest language families. 5.1.2: Identify the names and distribution of the two largest language families. 5.1.3: Identify the names and distribution of the largest language families in addition to Indo-European and Sino-Tibetan. 5.2.1: Learn the distribution of the Germanic and Indo-Iranian branches of Indo-European. Learning Outcomes 5.2.2: Learn the distribution of the Balto-Slavic and Romance branches of Indo-European. 5.2.3: Understand the origin and diffusion of English. 5.2.4: Understand the two theories of the origin and diffusion of Indo-European.