In a well-run conversation, certain presuppositions are taken for granted by the participants, which can be created or destroyed during the dialogue. These presuppositions evolve in a rule-governed manner, with the presuppositions at time \( t' \) depending on those at an earlier time \( t \) and the course of the conversation. Some statements require specific presuppositions to be acceptable; for example, "The king of France is bald" requires the presupposition that France has one and only one king. If a required presupposition is missing, the statement may become unacceptable, though the exact nature of this unacceptability varies. However, if a statement requires a missing presupposition, the presupposition can sometimes spring into existence, making the statement acceptable. The rule of accommodation for presupposition states that if a statement at time \( t \) requires presupposition \( P \) to be acceptable and \( P \) is not presupposed before \( t \), then \( P \) comes into existence at \( t \), provided certain conditions are met. In another example, consider a situation where one person (the master) controls another (the slave) through verbal commands. The master can shift the boundary between permissible and impermissible actions for the slave by stating that certain actions are impermissible. If this statement would be false if the boundary remained unchanged, the boundary moves inward, making the stated actions impermissible. Conversely, if the master states that certain actions are permissible, the boundary moves outward, expanding the permissible range.In a well-run conversation, certain presuppositions are taken for granted by the participants, which can be created or destroyed during the dialogue. These presuppositions evolve in a rule-governed manner, with the presuppositions at time \( t' \) depending on those at an earlier time \( t \) and the course of the conversation. Some statements require specific presuppositions to be acceptable; for example, "The king of France is bald" requires the presupposition that France has one and only one king. If a required presupposition is missing, the statement may become unacceptable, though the exact nature of this unacceptability varies. However, if a statement requires a missing presupposition, the presupposition can sometimes spring into existence, making the statement acceptable. The rule of accommodation for presupposition states that if a statement at time \( t \) requires presupposition \( P \) to be acceptable and \( P \) is not presupposed before \( t \), then \( P \) comes into existence at \( t \), provided certain conditions are met. In another example, consider a situation where one person (the master) controls another (the slave) through verbal commands. The master can shift the boundary between permissible and impermissible actions for the slave by stating that certain actions are impermissible. If this statement would be false if the boundary remained unchanged, the boundary moves inward, making the stated actions impermissible. Conversely, if the master states that certain actions are permissible, the boundary moves outward, expanding the permissible range.