| Abstract | 第1-5页 |
| 摘要 | 第5-10页 |
| 1. Introduction | 第10-12页 |
| 2. Literature Review | 第12-26页 |
| ·Research on Modality | 第12-23页 |
| ·The Definition of Modality in Systemic-Functional Grammar | 第13-14页 |
| ·Linguistic Modal Expressions | 第14-20页 |
| ·Two Variants of Modality | 第20-23页 |
| ·Research on News | 第23-26页 |
| ·The Definition and the Characteristics of News | 第23-24页 |
| ·Classification of News | 第24页 |
| ·The Study on Modality in News Reports | 第24-26页 |
| 3. Research Design | 第26-28页 |
| ·Research Questions | 第26页 |
| ·Research Methods | 第26页 |
| ·Data Collection | 第26-28页 |
| 4. Data Analysis and Discussion | 第28-58页 |
| ·The Frequency of Modality Occurrence | 第28-31页 |
| ·Frequencies of Modality Occurrence in Native English News Reports | 第28-29页 |
| ·Frequencies of Modality Occurrence in Nonnative English News Reports | 第29-31页 |
| ·Comparison of Values of Modality in Native and Nonnative English News Reports | 第31-42页 |
| ·Comparison of the Values of Modal Operators in Native and Nonnative English News Reports | 第31-36页 |
| ·Comparison of the Values of Modal Adjuncts in Native and Nonnative English News Reports | 第36-39页 |
| ·Comparison of the Values of Modality Metaphor in Native and Nonnative English News Reports | 第39-40页 |
| ·Comparison of the Values of Modal Lexical Words in Native and Nonnative English News Reports | 第40-41页 |
| ·Comparison of the Values of the Combination of the Modal Operators and Modal Adjuncts in Native and Nonnative English News Reports | 第41-42页 |
| ·Reasons for Different Value Inclinations | 第42-44页 |
| ·Responsibility | 第43页 |
| ·Cultural Values | 第43页 |
| ·Thinking Pattern | 第43-44页 |
| ·Mother Tongue Interference | 第44页 |
| ·Comparison of Orientations of Modality in Native and Nonnative English News Reports | 第44-54页 |
| ·The Frequency of Modality Occurrence in Native Samples | 第45-46页 |
| ·The Frequency of Modality Occurrence in Nonnative Samples | 第46页 |
| ·Explicit Subjective Orientation | 第46-48页 |
| ·Implicit Subjective Orientation | 第48-49页 |
| ·Implicit Objective Orientation | 第49-50页 |
| ·Explicit Objective Orientation | 第50-52页 |
| ·Summary | 第52-54页 |
| ·Reason for Different Inclinations of Modality Orientation | 第54-58页 |
| ·To Reflect Truth Objectively | 第56页 |
| ·To Express Politeness and Ease up the Atmosphere | 第56-57页 |
| ·To Interact and Negotiate | 第57-58页 |
| 5. Conclusion | 第58-62页 |
| ·Major Findings | 第58页 |
| ·Implications and Suggestions in Language Teaching | 第58-60页 |
| ·Limitations of the Thesis and Suggestions | 第60-62页 |
| Acknowledgements | 第62-64页 |
| Bibliography | 第64-67页 |
| Appendix | 第67-70页 |
