求助这两篇文献。谢谢!
 
Biber, D.,Conrad,  S.&R.  Reppen.  1998.  Corpus Linguistics:  Investigating Language Structure and Use [M].Cambridge: Cambridge University Press.
 
Biber, D. Johansson S.,Leech G,Conrad S.&E. Finegan.  1999. Longman Grammar of Spoken and Written English [M].London: Longman.