1. The concept of teaching

According to Brown (1987:6) states that teaching as a showing or helping someone to learn how to do something, giving instruction, causing to know or understand.

Teaching is a process profession conducted by using combination of art, science and skill. It is an art because it relies on the teacher creative provision of the best possible learning environment an activities for his/her students. It is a science, a system, an ordered set of ideas and method used by teacher in doing their main jobs; planning a lesson implementing the plan in the classroom and evaluating the outcome of the activities. It is a skill because theories and practice to assist students expertly in learning so that they are able to gain linguistics and communicative competence in the target language ( Newton in Saleh, 1997:16)

According to Pica in Saleh (1997:19) teaching is anteractive process between the teacher and students among students them selves. He students nee to comprehend the new language but can best do this when allow to ask about that they do not understand rather than rely on their teacher or text book to anticipate areas of comprehension difficulty and simply a priori.