This paper explores discourse connectives and their occurrences in contexts and assumed contexts.Based on Sperber and Wilson's relevance theory,we thereby discuss how discourse connectives constrain deduction and induction in discourse interpretation.Besides the apparent forms,there are visually hidden yet mentally existing forms of discourse connectives requiring the listener's cognitive knowledge to connect his known information with that of the speaker and to help produce new contexts and assumed contexts,which contribute to a sensible interpretation by the listener.