This paper focus on periphrastic nominalization — a construction which has nominal external syntax and which is used to express complement clauses. In this paper we examine the morphological and syntactic properties of this construction and compare those properties with those of typical nominalizations. In particular, a classification of nominalization into processes and results is used as the basis for comparison. As it is a crucial point regarding the contrast between a word and a construction, we also discuss whether the periphrastic nominalization shows signs of grammaticalization.