This book presents the latest research in various areas of cross-linguistic influence (CLI), providing educators with insights into how previously learned languages influence the learning of an additional language at different levels, such as phonetics/phonology, morphosyntax, vocabulary, pragmatics, writing style and learning context. While the majority of the chapters have English as the target language, one investigates the acquisition of French. The L1s of the learners include Arabic, Basque, Catalan, Chinese, Czech, Danish, Finnish, Galician, Georgian, German, Norwegian, Polish, Russian, Spanish and Swedish. Each chapter ends with a reflection on possible pedagogical implications of the findings and offers recommendations on how to make the most of cross-linguistic influence in the classroom.