| ACKNOWLEDGEMENTS | 第1-6页 |
| Abstract | 第6-7页 |
| 摘要 | 第7-10页 |
| Charpter 1 Introduction | 第10-12页 |
| ·Introduction | 第10页 |
| ·Background | 第10-11页 |
| ·The Purpose of the Study | 第11页 |
| ·Summary | 第11-12页 |
| Chapter 2 Literature Review | 第12-19页 |
| ·Introduction | 第12页 |
| ·The Defining and Categorizing of Corpus Theory | 第12-19页 |
| ·Definitions of Corpus | 第12-13页 |
| ·Corpus Linguistics | 第13-14页 |
| ·A Brief History of Corpus | 第14-16页 |
| ·The Development of Corpus | 第16-17页 |
| ·Why Use Corpora? | 第17-19页 |
| Chapter 3 Methodology | 第19-26页 |
| ·Introduction | 第19页 |
| ·The Purpose and Research Questions | 第19页 |
| ·Purpose of the Study | 第19页 |
| ·Subjects | 第19页 |
| ·Data Collection | 第19-26页 |
| ·The Data Collection Methodology and its Procedures | 第19-23页 |
| ·Tagging | 第23页 |
| ·Concordance Software | 第23页 |
| ·A Sample of the Corpus for PRETCO | 第23页 |
| ·The Procedure of Carrying out the Corpus for PRETCO | 第23-25页 |
| ·Concordances | 第24-25页 |
| ·Frequency List of the Grammatical Item | 第25页 |
| ·Summary | 第25-26页 |
| Chapter 4 General Explanation for the Statistical Data | 第26-61页 |
| ·Introduction | 第26页 |
| ·The Explanation of the Statistical Data | 第26-61页 |
| ·Tense Frequency Analysis of Level A ,PRETCO | 第26-29页 |
| ·Tens Frequency Analysis of Level B ,PRETCO | 第29-33页 |
| ·Sentence pattern Frequency Analysis of Level A ,PRETCO | 第33-59页 |
| ·Summary | 第59-61页 |
| Chapter 5 Conclusion and Implications | 第61-66页 |
| ·Introduction | 第61-64页 |
| ·The General Conclusion of the Study | 第61-64页 |
| ·The Conclusion of Tense Frequency Characteristics and its Distributing Model | 第61-62页 |
| ·The Conclusion of Sentence Pattern Frequency Characteristics and its Distributing Model | 第62页 |
| ·The Conclusion of Subordinate Clause Characteristics and its Distributing Model | 第62页 |
| ·The Conclusion of Interrogative Sentence Characteristics and its Distributing Model | 第62-63页 |
| ·The Conclusion of Verb Structure Characteristics and its Distributing Model | 第63页 |
| ·The Conclusion of Phrase Characteristics and Distributing Model | 第63页 |
| ·The Conclusion of Subjunctive Moods Characteristics and Distributing Model | 第63-64页 |
| ·Suggestions for Further Research | 第64-65页 |
| ·Summary | 第65-66页 |
| References | 第66-69页 |
| Appendices | 第69-71页 |
