Keywords: Duolingo, Blended learning, ICTs, Improvement of language abilities, Online language learning, Vocabulary and grammar. The improvement corroborated the effectiveness of the Duolingo platform in developing learners’ vocabulary and grammar acquisition. The results collected after a period of observation which lasted 10 weeks for both groups revealed that the improvement of the treatment group was statistically significant. The comparison of the results collected on the basis of the pre and post tests were used to show the degree to which informants managed to improve their vocabulary and grammar.
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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