Based on Ferdinand de Saussure’s syntagmatic and associative relations, this teaching material is made for Australian Police to quickly master basic Mandarin as a working language when communicating with Chinese people. The book introduces sentence structures which are highlighted in blue colour while each lesson provides elementary key words that are frequently used during day to day Police work. With the knowledge of sentence structures, Police learners can replace words and make new and more sentences after class. Besides, for Mandarin beginners, this book will help them to be sensitive to key Mandarin words and thus understand Chinese people even if they speak with an accent or mistakes. Finally, this book is helpful for both class studying and self-learning.