According to the constructionist theory, readersattempt to construct a meaningful referential situationmodel that addresses readers' goals,textual coherence,and the reasons for actions, events and states mentioned in the text. And inference generation is ratherimportant during comprehension. Inference can becategorized into thirteen classes, six of which are generated on-lined and five are off-line, and the remaining two are hard to determine how they are generated, and they require some factors. Some of th...