Ngiye, PascalSous la direction du : Pr. Hermenegilde Rwantabagu2026-04-222026-04-222017-07https://repository.ub.edu.bi/handle/123456789/2264A Thesis Submitted in Partial Fulfilment of the Requirements for the Award of the Degree "Licencie en Langue et Litterature Anglaises"The purpose of this study was to investigate on the relationships between the environment and students' proficiency in English. It sought to know the impact of mother tongue or first language on the target language. It also shows whether or not the language spoken in the environment hampers the effective use of The English language. This study was carried out with 156 respondents that is 150 students and 6 teachers in selected secondary schools in Mukike commune. The study is based on three research questions. The :first research question investigates the extent to which the environment contributes to students' performance in English. The second question explores the extent to which the language spoken in the environment of students have an impact on their performance in English. The last research question examines if Kirundi and French have a negative impact on learning of English. Thus, to collect data, to instruments were used, that is classroom observation, teachers' questionnaire and learner's questionnaire. The questionnaires were distributed to the 5th form level teachers in some selected schools in Mukike Commune. The fmdings showed that the environment hampers the students' performance in English. Since it has been proven that a poor learn in environment militates against satisfactory learning achievement. As solution, some recommendations were formulated to all education partners in order to improve learner's performance in English. Moreover, there is a suggestion that other researchers should carry out the basis further research in order to explore the problem in the other parts of the country.en