I am extremely grateful to all people for helping me to finish my
graduation paper.
Firstly, I would like to express my sincere and deep gratitude to my
supervisor- Ms Nguyen Thi Thu Huyen for her whole-hearted guidance and
valuable suggestion during the process of doing this research.
Secondly, I am also grateful to all teachers of Foreign Language
Department of Haiphong Private University for their enthusiastic assistance
during the time I study at my university.