Abstract 1. Introduction 2. Diverse Reading of Donkey NPs and Pronouns 3. Previous Analyses 3.1. Lappin and Francez(1994) 3.2. Yoon (1994, 1996) 4. The Ambiguity of Plural NPs 5. The Semantics of Indefinite NPs 5.1. The Ambiguity of Indefinite NPs 5.2. The Interpretations of Indefinite NPs 6. The Interpretations of Donkey Sentences 6.1. Dynamic Montague Grammar 6.2. The Interpretations of Donkey Sentences 7. Concluding Remarks References