2[1][3][8][9] Dudley-Evans, T. & St John, M. J. 1998. Developments in ESP: A Multi-disciplinary Approach [M]. Cambridge: Cambridge University Press. P53;P55-57;P61;P62
3[7]Ellis, M. & Johnson, C. 2002. Teaching Business English [M].Shanghai: Shanghai Foreign Language Education Press.
4[10]Yli-Jokipii, H. 1994. Requests in Professional Discourse: A CrossCultural Study of British, American and Finnish Business Writing [M].Helsinki: Suomalainen Tiedeakatemia. Matthiessen, C. Glossary of Systemic Functional terms. At: http://minerva. ling. mq. edu. au/resource/VirtuallLibrary/Glossary/sysglossary. htm
5Henson. Fundamentals of Business Communication [ M ]. Cincinnati : Southwestern Publishing Co. , 1990.
6Halliday M A K. A Course in Spoken English: Intonation [ M ]. Oxford: Oxford University Press, 1970.
7ChanneU J. Vague Language [ M ]. Oxford : Oxford University Press, 2000.