H. tries to extend the principles of truth-conditional semantics to non-declarative sentence-moods. The basic hypothesis is that the different syntactic moods should be characterized semantically in terms of their characteristic kind of possible denotation: declaratives can be said to denote propositions; similarly the imperative and interrogative mood can be characterized by assigning suitable and natural kinds of possible denotations which are a strictly compositional result of the characteristic syntax defining each mood.