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my friends and classmatesAcknowledgements First and foremost, I am most grateful to my supervisor, Professor XXX, whose useful suggestions, incisive ments and constructive criticism have contributed greatly to the pletion of this thesis. She devotes a considerable portion of her time to reading my manuscripts and making suggestions for further revisions. Her tremendous assistance in developing the framework for analysis and in having gone through the draft versions of this thesis several times as well as her great care in life deserve more thanks than I can find words to express.I am also greatly indebted to all my teachers who have helped me directly and indirectly in my studies. Any progress that I have made is the result of their profound concern and selfless devotion. Among them the following require mentioning: Professor XXX, Mr. XXX, and Mr. XXX.Acknowledgements I am greatly indebted to my thesis supervisor, Mr. XXX. Without his patient assistance and friendly encouragement, it would not be possible for me to plete this thesis in such a short period of time without reducing its scholarly quality. His willingness to give me his time so generously has been much appreciated. Truly, without his painstaking efforts in revising and polishing my drafts, the pletion of the present thesis would not have been possible.My sincere thanks should also go to all my teachers for their scholarly advice and generous help during my study in Foreign Language School of Linyi Normal University. Any progress that I have made is the result of their profound concern and selfle