“…The learning of second language (L2) morphosyntax remains an interesting yet challenging area of research that primarily investigates how learners extract, internalize, and subsequently produce various aspects of morphosyntax, and whether learners’ prior knowledge or individual differences affect their morphosyntactic development (e.g., Ellis, ; Lardiere, ; MacWhinney, ). Among the chief challenges is the issue of how L2 morphosyntax is learned in the earliest stages of learners’ exposure to input, on the assumption that learners’ initial experience with linguistic input can predict and explain their eventual learning outcomes (Gullberg, Roberts, & Dimroth, ; Rast, ). Construction learning studies have shown that a completely novel pattern can be detected and elicited even after brief exposure to low type‐frequency input (Fulga & McDonough, ; Nakamura, ; McDonough & Trofimovich, ).…”