Expectation discrepancy information is a new kind of information that contradicts the speaker’ s cognitive schema, and has three information sources of witness, hearsay, and inference. Expectation discrepancy information is the contrast focus of the sentence, and expectation is pragmatic presupposition. Expectationdiscrepancy category belongs to epistemic modality. Its core meaning is counter-expectation and surprisedmood, while the margin meaning is deviation of expectation, doubt, dissatisfaction and frustration. Humanlanguage employs phonol...