ABSTRACT
This paper first explores the origin and development of vague language combined with the research at home and abroad and points out its indispensible place. It then elaborates the definition and characteristics of Business English and shows the positive role of using vague language in business correspondence. That is, making business expression more flexible, thereby enhancing the courtesy. To be more specific，it not only makes the delivery of business message more accurate but also broadens human’s imagination. As a result, the listener is going to accept the information easily and the permissive chance will be increased. At last, the analysis and comparison of using vague language in business correspondence at home and abroad will be given and the feasible advice will be present.
Key words：Vague Language; Business Correspondence; Politeness Principle
Contents
1．Introduction 1
1.1 Necessity and significance of the study 1
1.2 Outline of the thesis 1
2. Vague language at home and abroad 3
2.1 Origin and definition of vague language 3
2.2 Clarification of some terms 6
2.3 Summary 8
3. Definition and characteristics of Business English 9
3.1 Principles of Business English 9
3.2 Necessity of using vague language in business correspondence 11
4. The Effect of vague language in business correspondence 13
4.1 Improving politeness 13
4.2 Enhancing the expression 15
5. Comparison and analysis of using vague language in business correspondence at home and abroad 18
6．Conclusion 22
Acknowledgements 23
References 24
