 It may or may not be meaning-preserving to replace (5a)’s prepositional phrase with (6a)’s purpose clause, but even if it is meaning-preserving, that is insufficient to show that (6a) or (6b) articulates the semantics of (5a); it may merely be a synonym. However, with ‘need’ and desire verbs, evidence for the presence of a hidden clause is strong. For example, in