| Chapter 1 Introduction | 第1-13页 |
| ·Categorization and prototype | 第9页 |
| ·Prototypicality and category Tense-Aspect | 第9-10页 |
| ·The general framework of the thesis | 第10-13页 |
| Chapter 2 Literature review | 第13-24页 |
| ·Review of the prototype theory in cognitive research | 第13-20页 |
| ·Classical approach to categorization and prototype theory | 第13-18页 |
| ·The theory of basic level category | 第18-20页 |
| ·Review of the research on tense-aspect system | 第20-24页 |
| ·Schools of the theories on tense and aspect | 第20-21页 |
| ·Similarities between lexical category and tense-aspect category | 第21-24页 |
| Chapter 3 Simple present tense serves as the prototype in Tense-Aspect system | 第24-32页 |
| ·Simple present tense serves as prototype in the system | 第24-26页 |
| ·Realization of the prototype in category Tense-Aspect | 第26-32页 |
| ·Investigations on prototype in category Tense-Aspect | 第28-30页 |
| ·Typological evidence for the definition of prototype | 第30-32页 |
| Chapter 4 Cognitive properties of category Tense-Aspect | 第32-45页 |
| ·Tense-aspect category extends in the way of concatenation | 第33-35页 |
| ·Tense-aspect category expands in the way of radiation | 第35-38页 |
| ·Vagueness exists in the boundary of tense-aspect category | 第38-41页 |
| ·Cognitive mechanism in the categorization of the system | 第41-45页 |
| Chapter 5 Summary and suggested area for farther research | 第45-49页 |
| ·Summary | 第45-47页 |
| ·Suggested areas for further research | 第47-49页 |
| Bibliography | 第49-52页 |
| Appendix | 第52页 |
| Questionnaire | 第52页 |
