We provide examples of plurals related to ambiguity and anaphora that pose problems or are counterexamples for current approaches to plurals. We then propose a dynamic semantics based on an extension of dynamic predicate logic (DPL<sup>+</sup>) to handle these examples. On our theory, different readings of sentences or discourses containing plu­rals don't arise from a postulated ambiguity of plural terms or predicates applying to plural DPs, but follow rather from different types of

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... dynamic transitions that manip­ulate inputs and outputs from formulas or discourse constituents. Many aspects of meaning can affect the type dynamic transitions : the lexical semantics of predicates to the left and right of a transition, and number features of DPs and discourse constraints like parallelism.