On Abnormal Phenomena in Online Conversation Discourse

From 1990's,online conversation discourse has become a kind of usual discourse besides written discourse and oral discourse.Under the environment of "network",the online conversation discourse,also called "interacting written discourse" and "keyboard conversation",has got some features different from traditional discourses,such as parallel development of double or more topics in online conversation discourse and the variation and simplification of language,which cannot be explained by normal conversation rules and pragmatic rules.These unusual phenomena can be interpreted with "common ground" and "appropriateness" of pragmatic presupposition.In addition,these concepts are helpful to understand meaning construction of the discourse from the angle of cognition.