Chapter 6 draws a conclusion of the thesis, which gives a summary to the whole paper.Besides the major findings of the study, it also points out the limitations and difficulties of thepresent study.

　　2 CONTENTS

　　Abstract in Chinese

　　Abstract in English

　　1 Introduction

　　1.1 Background of the Study

　　1.2 Significance of the Study

　　1.3 Layout of the Thesis

　　2 Literature Review

　　2.1 Studies on Business English Correspondence Abroad and at Home

　　2.2 Studies based on Corpus Linguistics Abroad and at Home

　　2.3 Summary

　　3 Theoretical Framework

　　3.1 Writing Principles of Business English Correspondence

　　3.2 Lexical Grammar

　　3.3 Syntactic Theory

　　4 Methodology

　　4.1 Corpus-Based Approach

　　4.2 Research Instruments

　　4.3 Research Procedures

　　4.3.1 Data Collection

　　4.3.2 Data Clean-up

　　4.3.3 Tokenization

　　4.3.4 Lemmatization

　　4.3.5 Part-of-speech Tagging

　　5 Results and Discussions

　　5.1 Syntactic Complexity Analysis

　　5.1.1 Analysis of Word Length and Sentence Length

　　5.1.2 Contrastive Analysis between Content Words and Function Words

　　5.1.3 Contrastive Analysis between Simple Sentence and Complex Sentence

　　5.2 Syntactic Pattern Analysis

　　5.2.1 Passive Voice

　　5.2.2 Interrogative Sentence

　　5.2.3 Subjunctive Mood

　　5.3 Syntactic Feature Analysis

　　5.3.1 Syntactic Feature of Letters of Request and Comfirmation

　　5.3.2 Syntactic Feature of Letters of Acceptance and Refusal

　　5.3.3 Syntactic Feature of Letters of Appreciation and Apology

　　6 Conclusion

　　6.1 Major Findings

　　6.2 Implications for the Study

　　6.3 Limitations

　　Acknowledgement

　　References

　　Appendix

　　Papers published in the period of Ph. M. education

　　进度安排

　　1.Collecting the related materials and designing theresearch, data analysis: Sep.1st-Dec.31st,20xx

　　2.Writing the first draft: Jan.1st- Feb.31st, 20xx

　　3.Writing the second draft:Mar. 1st- Apr. 31st,20xx

　　4.Writing the final draft: May. 1st- May.31st,20xx

　　5.Preparing for defense of the thesis: June.1st- June31st,20xx

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