Hedges are linguistic devices used by speakers to acknowledge they may not fully adhere to the maxims of quality, quantity, relation and manner. Examples of hedges include "I'm not sure if..." or "As far as I know..." which show respect for the quality maxim. Hedges allow speakers to convey uncertainty or lack of information while still communicating effectively. Inference is a conclusion drawn by a listener based on their background knowledge, while a presupposition is an implicit assumption that underlies what is said.