a semantic relation between two events that involves a logical material implication relation between their corresponding propositions, some type of causal relation between the corresponding events, and non-positive epistemic stance. Example: If you press this button, the door will open is an instance of the conditional relation and construction. The causally antecedent proposition is the protasis, and the causally consequent proposition is the apodosis. A conditional may express a content, epistemic or speech act causal relation. (Section 17.3.1)