If you define "knowledge" to be the deeply rooted fundamental structure of the language which allows you to produce and understand it in the first place, and "use" as any concrete instance of it, such ...

Penn State Professor of German and Linguistics Michael Putnam has spent a good part of his career thinking about language attrition, or "language loss," among bi- and multilingual speakers. Now, it's ...

The first language a person learns is known as their native language and is usually a major part of their identity, shaping their earliest thoughts and connecting them with their culture and heritage.