This book reports on a longitudinal study of the acquisition of pragmatic markers in written discourse in a third language (English) by secondary students living in the bilingual (Spanish and Catalan) Valencian Community in Spain. It examines pragmatic transfer, specifically positive transfer, in multilingual students from a holistic perspective, taking into account their linguistic repertoire and using ecologically valid classroom writing tasks in a longitudinal study. It tackles the issue of task-based language teaching from a multilingual perspective by presenting a study which takes place in natural classroom contexts where real classroom tasks are used to explore the interaction between languages in multilinguals. The book combines a focus on multilingual language development and pragmatics and discusses the resources multilingual learners take to the classroom.