The double-verb construction in Mbya Guarani is described. In this construction, the second verb (V2) has a distinctive morphology. It is concluded that the construction, examined from several viewpoints (lexico-semantic, phonological, morphological, and syntactic) is a phrase in which V2 functions as a modifier of V1, and that is different from other constructions in the language, such as clause subordination and verbal coordination. On the other hand, it is seen to have much in common with serial verb constructions documented for the languages of West Africa, the Caribbean, East and Southeast Asia, and Papua New Guinea. A 24-item bibliography is included. (MSE)