The treatment group was requested to complete at least 5 Duolingo lessons, lasting between 15 to 20 minutes every week. After a placement test, the participants were equally divided into two groups: a control group and a treatment group. To see to what extent the Duolingo is effective, seventy adult learners of English enrolled in the intensive school of foreign language teaching were selected for the study to test the hypothesis that adults using the Duolingo show better results than who using the teacher-directed methods. Adult learners of English tend to have busy schedules and find it hard to practise and accomplish their assignments outside the classroom. This study intends to investigate the effectiveness of Duolingo, a free online language learning platform, the objective of which is to develop English vocabulary and grammar acquisition for adult beginner. Mohamed Lamine Debaghine, Sétif 2 University
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