ACKNOWLEDGEMENT

Alhamdulillah, all praises and thanks to , the Lord of universe who has given us His uncountable graces. Shalawat and Salam always blessed and poured down upon our beloved prophet S.A.W. In the completion this thesis, the writer wishes to acknowledge her deepest gratitude for all generous guidance and assistence which has been given to her by a of people. The highest appreciation goes to her two advisers, Prof. Dr. Lince Sihombing, M.Pd as her first adviser and Dr. I. Wayan Dirgayasa T, M.Hum as her second adviser for all of their guidance through the completion of this thesis. Then, her appreciation also goes to Prof. Dr. Busmin Gurning, M.Pd as the Head of English Applied Linguistics Study Program who have assisted her in the requirement of administration process during the study in the Post Graduate Program of State University of Medan. The writer’s great thanks also goes to her reviewers or examiners, Prof. Amrin Saragih, M.A., Ph.D., Prof. T. Silvana Sinar, Ph.D., and Dr. Sri Minda Murni, M.S for their suggestions, criticisms, opinions, and improvements to this thesis. The writer also would like to express her thankfulness for all lectures who teach her during the academic years of LTBI. Then, her gratitude goes to her friends as well (Atiqah, Novita, Gewin, Vista, Eka, Ade), and all friends in LTBI A3 XXIII who had given encouragement in writing this thesis. Her thank also dedicated to Bang Farid for his kindness at helping administration of LTBI. A special gratitude is given for her beloved husband and children: Ari Romianda, Ricca Safina, Soraya Mayori, Safira, Syalaisha Shakira, and Naurah Shafiyyah, her beloved parents: H. Sofyan Efendi Lubis, Hj. Siti Ida Murniati, and also her beloved sisters for their sincere prayers, love, and support during her academic years in completing her study. May Allah SWT always blesses them.

Finally, may this thesis be useful for every one who needs it, and the construction criticism are expected from the readers.

Medan, June 2015 The writer,

Sofia Idawati Lubis Reg.Num.8136111054