Modal items of different semantic types can only be combined in a specific order.Epistemic items, for instance, cannot be embedded under deontic ones.I'll argue that this fact cannot be explained by the current semantic theories of modality.A solution to this problem will be developed in an update semantics framework.On the semantic side, a distinction will be drawn between circumstantial information about the world and information about duties, whereas I'll use Nuyts' notion of m-performativity to account for certain use of the modal items.
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