I am indebted to many beloved people for their providing me incentive and
support during the time that I was writing this graduation paper. Firstly, I would
like to express my sincere gratitude to my supervisor, Mr. Trinh Van Sach (M.A)
at the Foreign Language Department of Hai Phong Private University for his
various materials, constant support, advice and valuable comments on draft
chapters to complete this study.
I also offer my sincere thanks to Ms. Tran Thi Ngoc Lien, Dean of Foreign
Language for her help and instructions.