| Abstract | 第1-5页 |
| 摘要 | 第5-8页 |
| 1. Introduction | 第8-12页 |
| ·Purpose and significance of the paper | 第8-9页 |
| ·Methodology to conduct the present study | 第9-10页 |
| ·Data collection | 第9页 |
| ·Approaches to data analysis | 第9-10页 |
| ·Organization of the thesis | 第10-12页 |
| 2.Literature review | 第12-18页 |
| ·The application of systemic functional grammar to the study of the interpersonal meaning abroad | 第12-13页 |
| ·The application of systemic functional grammar to the study of the interpersonal meaning at home | 第13-18页 |
| 3.Theoretical basis | 第18-32页 |
| ·A brief introduction to Halliday’s Systemic-Functional Grammar | 第18-19页 |
| ·Interpersonal Meaning | 第19-20页 |
| ·Modality | 第20-32页 |
| ·Types of modality | 第20-21页 |
| ·Ways to realize modality | 第21-24页 |
| ·Modal values | 第24-26页 |
| ·Modal orientation | 第26-29页 |
| ·The relationship between different modal expression and politeness | 第29-32页 |
| 4.Modality analysis of interpersonal meaning in PSAs | 第32-62页 |
| ·The distribution of modal expression in the three various types of PSAs | 第32-54页 |
| ·General distribution of various modal expressions in the three types of PSAs | 第32-36页 |
| ·Specific distribution of various modal expressions in the three types of PSAs | 第36-50页 |
| ·Modality as politeness policies | 第50-54页 |
| ·The distribution of modal orientation in the three various types of PSAs | 第54-62页 |
| ·Specific distribution | 第55-59页 |
| ·Reasons for modality orientation above | 第59-61页 |
| ·Modal orientation and politeness policies | 第61-62页 |
| 5.Conclusion | 第62-66页 |
| ·Findings of the present study | 第62-63页 |
| ·Limitation of the present study and suggestions for the futrue research | 第63-66页 |
| Acknowledgements | 第66-68页 |
| Bibliography | 第68-72页 |
| Appendix | 第72-73页 |
