THE EFFECT OF USING THE DUOLINGO APPLICATION IN ENRICHING SENIOR HIGH SCHOOL …

Abstract This research aimed to find out the effect of using the Duolingo application in enriching high school students’ vocabulary mastery. The participants of this research were eleventh-grade students at a private school in Riau Province in the academic year 2024/2025. The study used a pre-experimental method with a one-shot case study design. Sampling was done using purposive sampling, s…