http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
The book consists of ten units. Each unit contains a group of fifteen base sentences related to a meaningful situation. Units in this book contain Base Sentences, Intonation practice, Substitution Drills, Conversation, and Exercises. Beginning with this book, a Grammar Study materials and review exercises are added to each unit