Duolingo has become one of the most widely used gamification apps for learning English, mostly for vocabulary and grammar. However, there is limited research on its effectiveness in enhancing writing skills. This study aimed to investigate the effect of Duolingo on junior high school students' learning English as a Foreign Language (EFL) writing skills, focusing on the overall score and five components: content, organization, vocabulary, language use, and mechanics. The study used a quasi-experimental design, specifically the non-equivalent control group, involving 41 eighth-grade students in experimental and control groups. Both groups were assigned writing tests as a pre-test and a post-test. The experimental group received an intervention using Duolingo outside the classroom for eight weeks as a supplementary tool, while the control group only received regular English classes. The statistical analysis using the independent t-test and ANCOVA revealed a significant improvement in writing skills in the experimental group (p < .05). It also showed an improvement in all writing components, especially content and organization. The partial eta squared value indicated a large effect of Duolingo (η²p = .878). These findings suggest that Duolingo has the potential to serve as a supplementary tool for improving writing skills in language learning.

This research explores the dependency on and patterns of artificial intelligence (AI) usage in English language learning among public university students in Bangladesh. The study aims to investigate the reasons behind students' reliance on AI tools, the types of information they seek, and the extent of their dependence. A mixed-method approach, combining both quantitative surveys and qualitative in-depth interviews, was employed to gather data from 120 students. The findings reveal that AI tools, particularly Grammarly and Duolingo, are widely used to improve academic writing, grammar, and vocabulary. Students perceive these tools as highly effective for language learning, as they provide instant feedback and make learning more accessible. However, the study also highlights significant concerns regarding the limitations of AI tools, such as their inability to grasp contextual understanding, cultural nuances, and the risk of over-reliance, which may hinder the development of critical thinking and metacognitive skills. Despite these concerns, students recognize the utility of AI tools as a complementary resource rather than a replacement for traditional learning methods. The research suggests that AI tools should be integrated into language learning in a balanced manner, with attention to equity in access and the development of students' higher-order thinking skills. It also emphasizes the need for policy interventions to address the digital divide and ensure that all students, particularly in resource-limited environments, have equitable access to these transformative tools.