During his career, the author Sarfuddin Ahmed was a German language teacher at the Modern Language Institute of Dhaka University Bangladesh and later the head of the language department at Goethe-Institut, Dhaka. In his student life, he completed three-year German teacher training course at Goethe-Institut Munich from 1980 to 1982, and later studied German language and literature and German linguistics at the University of Munich (Ludwig-Maximilians-Universität, LMU) Germany from 1986 to 1994 and obtained M.A. degree. This book is written in light of his long teaching experience.