For foreign language learners (and everyone else for that matter) a wide vocabulary will make you seem well-read. Control over grammar gives an heir of confidence and worldliness. Having natural sounding pronunciation, it seems, will earn acceptance.
Alyssa, a dual US-German citizen, learned as a child that sounding “right” in a second language comes in handy at an age when fitting in means everything. She shares her ideas on bilingualism and how as a kid it made going to Burger King an exercise in patience and perseverance.