In this book, the authors present research and theory to argue that metalinguistic awareness of one's native language is altered by either the acquisition or the learning of a second language. The main argument is that people with more than one language have different knowledge of their first language (L1) than do monolingual people, and this difference can mainly be due to the effect of subsequent languages on the development and use of L1 skills.

In this book, the authors present research and theory to argue that metalinguistic awareness of one's native language is altered by either the acquisition or the learning of a second language.