5Wurff W.van der.Gerunds and their objects in the Modem English period[A].J.van Marle.Historical Linguistics[C].Amsterdam:John Benjamins Publishing Company.1991.
6Verschueren J..Understanding Pragmatics[M].London and New York:Arnold,1999.
7Asher R.E..The Encyclopedia of Language and Linguistics[M].Oxford:Pergmon Press,1994.
9Turner Mark,Gilles Fauconnier.Conceptual Integration in Counterfactuals[A].Jean Pierre Koenig.Discourse and Cognition:Bridging the Gap[C].V.II.Stanford,California:Center for the Study of Language and Information,1998.