It-clefts are IT (Inquiry Terminating) constructions

We offer a new analysis of the semantics of the English it-cleft, building on recent work on exclusive particles such as "only." The analysis emphasizes the discourse function of clefts – which, we claim, is to terminate a line of inquiry by marking an answer as complete. It accounts for the semantic effects – not previously appreciated – of focus placement within the cleft pivot. It also provides a solution to a previously discussed problem with the projection of exhaustivity from embedded contexts