1. INTRODUCTION Language is one of the distinctive characteristic of human beings and one of the most important ways of expressing our love or our hatred; it is vital for achieving many of our goals and our careers; we use language for planning our lives and remembering our past; we exchange ideas and experiences through language, so some people know more than one language. Knowing another language may helpful for us to getting a job; a chance to higher education; an access to others' original edition of literature and cultural knowledge; the opportunity to go abroad to travel or emigrate to another country... It affects people's career and possible futures, their lives and future. In today's world, with the development of economy and international connection, more and more people speak more than one language, so language learning and language teaching are vital to the everyday lives of millions of people.
