This is well comprehensive study of English language which emphasizes the proficiency of the spoken medium as form of communication and system of teaching English language in North-Eastern part of Bangladesh for Ph.D. research work. Some treatment of the historical background of this area is included as well as information concerning the acoustic nature of English language proficiency of EFL (English as a Foreign Language) learners.This book is intended for advanced students and for teachers of English. As a reference book it contains information from EFL Learners and teachers of English language ranging from relatively simple points to advanced problems.