0 USE OF COMPUTER AIDED TECHNIQUES IN THE TEACHING OF AURAL-ORAL SKILLS: A CASE STUDY OF THE ELT STUDENTS IN HODEIDAH UNIVERSITY THESIS SUBMITTED FOR THE AWARD OF THE DEGREE OF DOCTOR OF PHILOSOPHY IN LINGUISTICS By Hassan Saleh Mahdi Mohammed Under the Supervision of Prof. S. Imtiaz Hasnain (Supervisor) and Prof. M. Salim Beg (Co-supervisor) DEPARTMENT OF LINGUISTICS ALIGRAH MUSLIM UNIVERSITY ALIGARH (INDIA) 2008