6Rechards,J. C etc. Longman Dictionary of Language Teach- ing and Applied Linguistics [ M]. Beijing : Foreign Language Teaching and Research Press, 2005 : 465.
7Halliday M. A. K. An Introduction to Functional Grammar [M]. London: Edward Arnold. 1994.
8胡牡麟.语篇的衔接与连贯[M].上海:上海外语教育出版社,1994:151.
9连淑能.英汉语对比研究[M].北京:高等教育出版社,2006:104.
10Biber, Douglas et al. Longman Grammar of Spoken and Written English [ M ]. Pearson Education Limited, 1999.