The depictive secondary predication construction has two subject-predicate relationships in one clause, providing two propositional interpretations. This article proposes that the primary predication, which consists of a main verb, and the secondary predication, made up of a secondary predicate, are simultaneously derived in separate derivational planes; this proposal reflects a property of the secondary predicate that is not included in the θ-grid of the primary predicate. The idea of using Parallel Merge to merge these two planes that share a common element allows us to understand the secondary predication construction in a novel way.