The purpose of this paper is to support the argument that the cleft clause of it-clefts appears in an extraposed position adjoined to VP(Hedberg 2000, Den Dikken 2006, Reeve 2012). In this paper I provide additional evidence that their view offers a powerful tool to analyze the properties of it-clefts. I do so by examining many examples extracted from previous studies of discourse andsyntactic/semantic analyses. Reeve(2012) introduces a new functional category Eq only for specificational sentences - a category which appears in the extended verbal projection. However, the syntactic benefit of using Eq is not substantial. The specificational property of it-clefts can be understood directly by the property (not individual) denoting subject it itself and the clefted XP. For this reason, I instead use the category vP whose function has been widely attested. I show that the Complement Principle of Culicover & Rochemont(1990) can appropriately identify the cleft clause. (Korea National Open University)