In interactive discourse we not only express propositions, but we also express different attitudes to them. That is, we communicate how our mind entertains those propositions that we express. A speaker is able to express an attitude of belief, desire, hope, doubt, fear, regret or pretence that a given proposition represents a true state of affairs. This collection of papers explores the contribution of particles and other uninflected mood-indicating function words to the expression of propositional attitude in the broad sense.