| 摘要 | 第1-6页 |
| Abstract | 第6-17页 |
| Introduction | 第17-22页 |
| Chapter 1 Literature Review | 第22-48页 |
| ·Research on Tense | 第22-27页 |
| ·Definition of Tense | 第22-23页 |
| ·Past Tense vs. Present Tense | 第23-24页 |
| ·Characteristics of English Present Perfect | 第24-26页 |
| ·Related Studies on English Present Perfect | 第26-27页 |
| ·Research on Lexical Aspect | 第27-39页 |
| ·Definition of Aspect | 第28页 |
| ·Grammatical Aspect vs. Lexical Aspect | 第28-29页 |
| ·Characteristics of Lexical Aspect | 第29-32页 |
| ·The Aspect Hypothesis | 第32-34页 |
| ·Related Studies on Lexical Aspect | 第34-39页 |
| ·Verb Salience | 第39-46页 |
| ·Definition of Verb Salience | 第39-41页 |
| ·Classificacion of Verb Salience | 第41-42页 |
| ·The Principle of Perceptual Saliency | 第42-43页 |
| ·Related Studies on Verb Salience | 第43-46页 |
| ·Necessity for the Present Study | 第46-48页 |
| Chapter 2 Research Design | 第48-53页 |
| ·Research Purpose | 第48页 |
| ·Research Questions | 第48-49页 |
| ·Subjects | 第49页 |
| ·Variables | 第49-50页 |
| ·Instruments and Procedures | 第50-51页 |
| ·Data Coding | 第51-53页 |
| Chapter 3 Research Results and Discussions | 第53-73页 |
| ·Distribution of Alternatives to Present Perfect Tense | 第53-55页 |
| ·The Effect of Lexical Aspect on Present Perfect Use | 第55-63页 |
| ·The Distribution of Alternatives to Present Perfect by Lexical Aspect | 第55-57页 |
| ·Lexical Aspect and Present Perfect Use | 第57-63页 |
| ·The Effect of Verb Salience on Present Perfect Use | 第63-69页 |
| ·The Distribution of Present Perfect Variation by Verb Salience | 第64-65页 |
| ·Verb Salience and Present Perfect Use | 第65-69页 |
| ·The Interaction Between Lexical Aspect and Verb Salience | 第69-73页 |
| Chapter 4 Research Findings and Implications | 第73-90页 |
| ·Research Findings | 第73-86页 |
| ·Findings on the Alternatives to Present Perfect Tense | 第73-76页 |
| ·Findings on the Effect of Lexical Aspect on Present Perfect Use | 第76-83页 |
| ·Findings on the Spreading of Present Perfect Use | 第76-79页 |
| ·Findings on the Association Between Present Inflections and Statives | 第79-81页 |
| ·Findings on the Association Between Proficiency Level and Lexical Aspect | 第81-83页 |
| ·Findings on the Effect of Verb Salience on Present Perfect Use | 第83-85页 |
| ·Findings on the Interaction Between Lexical Aspect and Verb Salience | 第85-86页 |
| ·Implications | 第86-90页 |
| ·Implications to English Teachers | 第86-87页 |
| ·Implications to English Learners | 第87-88页 |
| ·Implications to Researchers | 第88-90页 |
| Conclusion | 第90-93页 |
| Bibliography | 第93-100页 |
| Appendices | 第100-108页 |
| Appendix 1 | 第100-102页 |
| Appendix 2 | 第102页 |
| Appendix 3 | 第102-103页 |
| Appendix 4 | 第103-104页 |
| Appendix 5 | 第104-105页 |
| Appendix 6 | 第105-108页 |
| Acknowledgements | 第108-109页 |
| 攻读硕士学位期间研究成果 | 第109页 |
