Abstract: Cognate verbs include unaccusative and unergative verbs. Cognate object of the unaccusative verb is an adverb, occupying an adjunct position, having no case to be checked. In a cognate construction, the unergative verb is derived from N; the cognate object is a copy of N, holding the internal argumental position, having case to be checked: via merging with Tr, N is derived into V; its copy establishes a checking relation with Tr which checks accusative case of the copy.