| Acknowledgements | 第1-6页 |
| Abstract | 第6-8页 |
| 摘要 | 第8-10页 |
| List of tables | 第10-11页 |
| List of Chart | 第11-15页 |
| Chapter One Introduction | 第15-22页 |
| ·Background of the research | 第15-16页 |
| ·Significance of the research | 第16-19页 |
| ·Research questions | 第19-20页 |
| ·Thesis organization | 第20-22页 |
| Chapter Two Literature Review | 第22-36页 |
| ·Definition of lexical formulae | 第22-24页 |
| ·Classification of lexical formulae | 第24-29页 |
| ·Polywords | 第24-25页 |
| ·Institutionalized expressions | 第25页 |
| ·Phrasal constraints | 第25-26页 |
| ·Sentence builders | 第26-29页 |
| ·Previous studies on lexical formulae at home and abroad | 第29-31页 |
| ·Previous studies on lexical formulae abroad | 第29-31页 |
| ·Previous studies on lexical formulae in China | 第31页 |
| ·Researches on lexical formulae in writing at home and abroad | 第31-36页 |
| ·Studies on lexical formulae in writing abroad | 第31-33页 |
| ·The study on lexical formulae in writing in China | 第33-35页 |
| ·Comments on the study | 第35-36页 |
| Chapter Three Theoretical Framework | 第36-44页 |
| ·Theories of lexical formulae from cognitive perspectives | 第36-41页 |
| ·Empirical view of language and lexical formulae | 第36-37页 |
| ·Gestalt theory and lexical formulae | 第37-39页 |
| ·Prototype theory and lexical formulae | 第39-40页 |
| ·Cognitive grammar and lexical formulae | 第40-41页 |
| ·Lexical formulae from the perspective of psycholinguistics | 第41-42页 |
| ·Learning method and lexical formulae | 第42-44页 |
| Chapter Four Methodology | 第44-51页 |
| ·Subjects | 第44-47页 |
| ·Instruments | 第47-49页 |
| ·Spoken and written English corpus of Chinese learners | 第47页 |
| ·Writing materials from English majors | 第47-49页 |
| ·Data collection | 第49-50页 |
| ·Data analysis | 第50-51页 |
| Chapter Five Results and Discussion | 第51-71页 |
| ·Quantitative analysis | 第51-64页 |
| ·The general descriptive statistics of lexical formulae | 第51-56页 |
| ·Comparative analysis of the four types of LF within Group | 第56-59页 |
| ·Comparative analysis on four types of LF between two Groups | 第59-60页 |
| ·Analysis of significant difference of T-test | 第60-64页 |
| ·Qualitative analysis | 第64-71页 |
| ·The two groups’differences in LF for expressing assertion | 第66-68页 |
| ·The two groups’common features of LF in expressing assertion | 第68-71页 |
| Chapter Six Conclusion | 第71-79页 |
| ·Summary of this research | 第71-73页 |
| ·Implications | 第73-77页 |
| ·Strengthening awareness of lexical formulae | 第73-74页 |
| ·Enhancing awareness of style | 第74页 |
| ·Adjusting teaching and learning materials | 第74-75页 |
| ·Designing enough exercises about lexical formulae | 第75-76页 |
| ·Developing independent study | 第76页 |
| ·Promoting lexical formula teaching | 第76-77页 |
| ·Suggestions for further research | 第77-79页 |
| References | 第79-86页 |
| Appendix | 第86页 |
