The document discusses different types of inferences that readers make when comprehending text. It explains that readers are able to think inferentially by connecting their background knowledge to the text. Readers use imagination and visualization to draw conclusions and interpretations of the text. The document outlines several classes of inferences including anaphoric, bridging, explanatory, goal, elaborative, predictive, and process inferences. All of these inference processes work together to help the reader fully comprehend the text.