In traditional classifications of languages by inflectional subsystems, both creole languages and the results of untutored SLA (interlanguages) are classified as isolating. We focus on remnants of verbal inflectional morphology in French-related creoles and ask: (a) Can the properties of verbal morphology be attributed to SLA, and (b) what does this imply for creole genesis? We show how acquisition of inflectional morphology occurs in learner varieties of French from a basic variety perspective. We discuss reflexes of French inflectional morphology that survived the creolization process, resulting in a long–short opposition of verb forms: Across creoles, different grammatical properties are marked by this opposition. Finally, we consider the implications for creole genesis theories and propose a three-generational scenario of creolization with multiple agents.