Abstract 1. Introduction 1.1. Weak Island Insensitivity 1.2. D-linking and unselective binding 2. A Semantic account for extraction from a Weak Island(WI) 2.1. Rullman's maximlity requirement for wh-questions 2.2. Mathematical Condition vs. Pragmatic Condition 3. Discourse Requirements for Extraction from a Weak Island(WI). 3.1. Existential Presupposition 3.2. Definite vs. Indefinite wh-phrase 4. Discourse Semantic procedure 5. Summary and Conclusion References