This qualitative case study investigated how behavioural, cognitive, and emotional engagement manifested in task-based grammar learning and how Indonesian EFL undergraduates perceived the features supporting or constraining their engagement. Five first-semester students were recruited from a class of 25 in an English education program at a public university in West Java, Indonesia. Data were collected through semi-structured online interviews and students’ storytelling drafts. Interview transcripts were analysed using a six-phase thematic analysis, while the drafts were examined as complementary evidence of students’ grammatical choices and revisions. Member checking, peer debriefing, and data-source triangulation were employed to strengthen credibility. The findings revealed that behavioural engagement was manifested through active participation, persistence, error correction, and revision. Cognitive engagement emerged through narrative planning, text comparison, monitoring of grammatical choices, connection of grammar to meaningful contexts, and strategic use of digital resources. Emotional engagement involved enjoyment, enthusiasm, confidence, challenge, and occasional stress. Students generally perceived task-based grammar learning as meaningful and motivating because contextualised storytelling, familiar topics, planning, focused feedback, and revision enabled them to use grammar for communicative purposes. Nevertheless, excessive task demands, insufficient support, and difficulty transferring grammatical knowledge from structured tasks to spontaneous communication constrained their engagement. The study demonstrates that engagement in task-based grammar learning is multidimensional, interconnected, and conditional rather than an automatic outcome of task use. Grammar instruction should therefore combine meaningful tasks with manageable challenge, appropriate scaffolding, attention to form, and opportunities for reflective revision.
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