| Acknowledgements | 第1-5页 |
| Chinese Abstract | 第5-6页 |
| English Abstract | 第6-7页 |
| CONTENTS | 第7-8页 |
| I. Introduction | 第8-9页 |
| II. Literature Review | 第9-16页 |
| ·Studies on Presupposition | 第9-11页 |
| ·Semantic presupposition | 第11-12页 |
| ·Pragmatic presupposition | 第12-13页 |
| ·Presupposition triggers | 第13-16页 |
| III. Too in Traditional Grammar | 第16-18页 |
| ·Function of too in sentences | 第16页 |
| ·Position of too in sentences | 第16-17页 |
| ·Sentence structures of too-sentences | 第17-18页 |
| IV. Too as a semantic presupposition trigger | 第18-24页 |
| ·Too as a presuppositional element | 第18-19页 |
| ·Presuppositional characteristics of antecedents | 第19-21页 |
| ·Indefiniteness | 第19-20页 |
| ·implicitness | 第20-21页 |
| ·Additive meaning of too | 第21-22页 |
| ·The additive meaning of supplement | 第21页 |
| ·The additive meaning of identity | 第21页 |
| ·The additive meaning of continuity | 第21页 |
| ·The additive meaning of accumulation | 第21-22页 |
| ·The additive meaning of explanation | 第22页 |
| ·The additive meaning of comparison | 第22页 |
| ·The additive meaning of emphasis | 第22页 |
| ·Some extra explanation about the additive meaning | 第22-24页 |
| V. Too as a pragmatic presupposition trigger | 第24-30页 |
| ·Pragmatic presupposition with discrimination implicature | 第24-25页 |
| ·The function of too in discourse and context | 第25-30页 |
| ·The organizational function | 第26-27页 |
| ·The cohesive function | 第27-30页 |
| VI. Conclusion | 第30-31页 |
| Bibliography | 第31-33页 |
