In this project, I investigate, building on my previous research, hybrid subordinate clauses that emerge under language contact. By the term ‘hybrid subordinate clauses’ I mean subordinate clauses that blend two systems of combining clauses, one system native to the language in which the hybrid subordinate clauses are attested and the other system taken from another language. The phenomenon of hybrid subordinate clauses is an interesting one as it appears to reveal a fundamental mechanism that is at work in contact-induced language change. This mechanism takes apart the different templates used in constructing subordinate clauses and recombines them in several different ways. By blending different templates in this manner, the mechanism produces a range of constructions which resemble each other and appear to compete with one another, with the winners spreading in use and leading the change in language. Hybrid subordinate clauses were known to exist since at least Menz (1999), Bayer (2001), or Matras (2003), but our understanding of the range of patterns that they form and their relevance for contact-induced language change are just emerging, having begun with my investigation in Keskin (2023). In other words, there is a gap in research in this area, and studies are called for that investigate how hybrid subordinate clauses come about under the pressures of language contact, and how they form a pool of competing constructions that constitutes the foundation of language change. The two main tasks of the project while addressing this gap are the following: (i) describing the overall picture presented by hybrid subordinate clauses in Romeyka (Greek dialect spoken in northeastern Turkey) and Gagauz (Turkic variety spoken in Moldova), in order to establish the general patterns and correlations that hold across them, as well as the differences between them; (ii) offering explanations by answering such questions as how and why hybrid subordinate clauses come about, whether they originate in individual speakers or in groups of speakers, and which factors determine their form and distribution.