| Acknowledgements | 第4-5页 |
| Abstract | 第5-6页 |
| 摘要 | 第7-12页 |
| Chapter One Introduction | 第12-17页 |
| 1.1 General Background of the Study | 第12-14页 |
| 1.2 Necessity and Significance of the Study | 第14-15页 |
| 1.3 Objectives of the Study | 第15页 |
| 1.4 Structure of the Thesis | 第15-17页 |
| Chapter Two Literature Review | 第17-32页 |
| 2.1 Previous Studies on Grammatical Metaphor | 第17-27页 |
| 2.1.1 Definition of Grammatical Metaphor | 第17-18页 |
| 2.1.2 Other Relevant Studies | 第18-21页 |
| 2.1.3 Classification of Grammatical Metaphor | 第21-27页 |
| 2.2 Previous Studies on English PSAs on the Environmental Protection | 第27-32页 |
| 2.2.1 Definitions of PSAs | 第27-28页 |
| 2.2.2 Linguistic Features of PSAs | 第28-29页 |
| 2.2.3 Other Relevant Studies | 第29-32页 |
| Chapter Three Methodology | 第32-43页 |
| 3.1 Research Questions | 第32页 |
| 3.2 Data Collection | 第32-43页 |
| Chapter Four Results and Discussion | 第43-63页 |
| 4.1 Overall Distribution of Grammatical Metaphor in English PSAs on the Environmental Protection | 第43-46页 |
| 4.2. Grammatical Metaphor in English PSAs on the Environmental Protection | 第46-63页 |
| 4.2.1 Ideational Metaphor in English PSAs on the Environmental Protection | 第47-56页 |
| 4.2.1.1 Nominalization in English PSAs on the Environmental Protection | 第47-51页 |
| 4.2.1.2 Adjectivalization in English PSAs on the Environmental Protection | 第51-54页 |
| 4.2.1.3 Verbalization in English PSAs on the Environmental Protection | 第54-56页 |
| 4.2.2 Interpersonal Metaphor in English PSAs on the Environmental Protection | 第56-63页 |
| 4.2.2.1 Metaphor of Mood in English PSAs on the Environmental Protection | 第57-60页 |
| 4.2.2.2 Metaphor of Modality in English PSAs on the Environmental Protection | 第60-63页 |
| Chapter Five Conclusion | 第63-67页 |
| 5.1 Major Findings of the study | 第63-64页 |
| 5.2 Implications of the Study | 第64-65页 |
| 5.3 Limitations of the Study and Suggestions for Further Research | 第65-67页 |
| Works Cited | 第67-70页 |
| Appendix | 第70-87页 |
| Publications | 第87页 |
