CHAPTER 1 INTRODUCTION
1．1 Background to the Study
1．2 Outline of the Book

CHAPTER 2 DISCOURSE MARKERS
Introduction
2．1 Definitions of Discourse Markers
2．2 From Semantics to pragmatics -a polysemous account
2．3 Previous Studies on English Discourse Markers

CHAPTER 3 SOCIOLINGUISTIC VARIATION AND PRAGMATICS Introduction
3．1 Sociolinguistic variation studies
3．2 Discourse markers in variational pragmatics
3．3 Gaps in the Literature
3．4 Three discourse markers - well， you know， I think
3．5 Textual and interpersonal functions
3．6 Research questions

CHAPTER 4 METHODOLOGY
Introduction
4． 1 Methods used to investigate sociolinguistic variation of discourse markers
4．2 Corpus- based sociolinguistic variation studies
4．3 The BNCweb Query System
4．4 The social stratification of individual speakers
4．5 The definition of positions and functions
4．6 Data collection tools used in the present study

CHAPTER 5 WELL
Introduction
5．1 Descriptions of well
5．2 Sociolinguistic variation of well in the BNC
5．3 Well in Native and Non- native Dyads
5．4 Conclusions

CHAPTER 6 YOU KNOW
Introduction
6．1 Descriptions of you know
6．2 Sociolinguistic Variation of You know in the BNC
6．3 You know in native and non -native dyads
6．4 Conclusions

CHAPTER 7 1 THINK
Introduction
7．1 Descriptions of I think
7．2 Sociolinguistic Variation of I think in the BNC
7．3 I think in native and non - native dyads
7．4 Conclusions

CHAPTER 8 CONCLUSIONS
8．1 Summary of the findings
8．2 Contributions to the Field
8．3 Limitations and Suggestions for Future Research

REFERENCES
APPENDIX 1 ROLE - PLAY SCENARIO
APPENDIX 2 ROLE - PLAY CONSENT FORM
APPENDIX 3 ROLE - PLAY FEEDBACK FORM
APPENDIX 4 TRANSCRIPTION CONVENTIONS