Language Acquisition in a Nutshell: A Primer for Teachers will be your definitive guide on second languages and how they are acquired. Written in an easy-to-understand tone with an occasional touch of light-heartedness, Language Acquisition in a Nutshell is made for both teachers and teachers in training. It will show you new ways to think about second-language acquisition, while providing practical ways to implement your new insights. Language Acquisition in a Nutshell does not tell teachers how to teach or what to teach. Rather, the authors help teachers be as informed as possible as they make decisions about what they do and what they expect of their learners— and perhaps what they expect of themselves.
Very technical in terms of how we human acquire language, whether it is L1 (mother tongue) or L2 (second language). Language can be learned only implicitly by immersing yourself in language (environment), but not explicitly (in classroom, through textbook, through lessons, etc.). This bold statement based on theoretical and empirical research is the reconfirmation of my own experience.